future prospects of the op-cal levita-on experiment · 2017-04-28 · future prospects of the...
TRANSCRIPT
![Page 1: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/1.jpg)
Futureprospectsoftheop-callevita-onexperiment( )
KAGRAobservatory,Ins-tuteforcosmicrayresearch,
UniversityofTokyo
NAGANOKoji( )
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
![Page 2: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/2.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Q.WhoamI?A.I’mNAGANOKoji,1styearofPh.D.course,belongingtoKAGRAobservatory,ICRR,UniversityofTokyo.
Q.WhatdidIdoinmymastercourse?A.Istudiedonthequantumnoisereduc-ontechniqueforKAGRA(ponderomo-vesqueezingandhomodynedetec-on)inKashiwa,calledQND(quantumnon-demoli-on)exp..Fordetail,pleaseseemymasterthesisonJGW-P1706052.Inaddi-on,IvisitedCaltechandU.Grasgow.WhatIdidinCaltechwillbepublishedaspapersomeday.
Q.WillItalkaboutwhatIdidinmastercourse?A.No,Iwillnot.Iwilltalkaboutmyfuturework,“op-callevita-onexperiment,”whichIwilldoinmyPh.D.course.
Overture
![Page 3: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/3.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Introduc-on• Schedule• Applica-onsofop-callevita-ons• Experimentalsetupdesignproposal• Problems• Conclusion• Summary
Outline
![Page 4: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/4.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Forgravita-onal-wave(GW)detec-onsorstudiesofthemacroscopicquantummechanics,extremelylownoisesystemsarerequired.
• Abouttheseismicnoisereduc-on,suspensionsystemsareo`enused.
• However,thesuspensionsystemsinduceaddi-onalthermalnoises.
Introduc-on
K.Komori,Masterthesis,UniversityofTokyo(2016)
5-mgmirrorsuspension
E.Hirose+,CQG(2014)SuspensionsystemofKAGRA(Cryogenicpart)
![Page 5: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/5.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Suspensionthermalnoiseisoneofthemajornoisesourcesofinterferometerswhichclosethesensi-vitywindowreachingthestandardquantumlimit(SQL).
• ReachingSQLisakindofmilestoneofthetestofthemacroscopicquantummechanics.
• Inaddi-on,ifwecandemonstratetobeatSQL,thatis,toreducethequantumnoise,itleadstoimprovementofthesensi2vityofGWdetectors.
Introduc-on
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Thesuspensionthermalnoisecanbeex-nguishedwhenmassesarelevitatedwithop-calradia-onpressureinsteadofsuspendedwithmechanicalwires.
• Thistechniqueiscalledasanop-callevita-on(OL).
Introduc-on
fluctua-on
gravity
gravity
radia-onpressure
tension
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Introduc-on
光学浮上が熱い
2
mass scale
sensitivity(m/rtHz)
fg ng ug mg pg
-12
-11
-10
N. Kiesel+: PNAS 110, 14180 (2013) cavity / 0.15um / 10fg? / 64K, 4e-12 m/rtHz
-13
T. Li+: Science 328, 1673 (2010) T. Li+: Nature Physics 7, 527 (2011) tweezer / 1um / 1pg / 1.5mK, 1e-13 m/rtHz, Brownian velocity
A. Arvanitaki, A. A. Geraci : PRL 110, 071105 (2013) cavity / 0.2~75um / fg~pg / ~1e-14m/rtHz, GW
A. Ashkin+: Appl. Phys. Lett. 19, 283 (1971) tweezer / 20um / 10ng? / ?? m/rtHz
G. Guccione+: arXiv:1307.1175 cavity / 2mm / 0.3mg / ?? m/rtHz R. Kaltenbaek+ : Experimental Astronomy 34, 123 (2012)
cavity / 0.1um / 10fg? / ~1e-12m/rtHz?, MAQRO
S. Singh+: PRL 105, 213602 (2010) cavity+tweezer / 60um / 40ng / 1e-10m/rtHz
Y. Arita+: Nature Communications 4, 2374 (2013) tweezer / 4.4um / 0.1ng? / 40K, 1e-10 m/rtHz, gyroscope
Plankmass(22ug)
Y.Michimura,Seminarslide
![Page 8: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/8.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Introduc-on
光学浮上が熱い
2
mass scale
sensitivity(m/rtHz)
fg ng ug mg pg
-12
-11
-10
N. Kiesel+: PNAS 110, 14180 (2013) cavity / 0.15um / 10fg? / 64K, 4e-12 m/rtHz
-13
T. Li+: Science 328, 1673 (2010) T. Li+: Nature Physics 7, 527 (2011) tweezer / 1um / 1pg / 1.5mK, 1e-13 m/rtHz, Brownian velocity
A. Arvanitaki, A. A. Geraci : PRL 110, 071105 (2013) cavity / 0.2~75um / fg~pg / ~1e-14m/rtHz, GW
A. Ashkin+: Appl. Phys. Lett. 19, 283 (1971) tweezer / 20um / 10ng? / ?? m/rtHz
G. Guccione+: arXiv:1307.1175 cavity / 2mm / 0.3mg / ?? m/rtHz R. Kaltenbaek+ : Experimental Astronomy 34, 123 (2012)
cavity / 0.1um / 10fg? / ~1e-12m/rtHz?, MAQRO
S. Singh+: PRL 105, 213602 (2010) cavity+tweezer / 60um / 40ng / 1e-10m/rtHz
Y. Arita+: Nature Communications 4, 2374 (2013) tweezer / 4.4um / 0.1ng? / 40K, 1e-10 m/rtHz, gyroscope
Plankmass(22ug)
Y.Michimura,Seminarslide
![Page 9: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/9.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Sofar,twotypes(ormore?)ofOLsformg-scalemirrorshavebeenproposed.
Introduc-on
tripodtypesandwichtype
Y.Kuwahara,Masterthesis,UniversityofTokyo(2016)
Y.Michimura+,arXiv(2017),Opt.Express(underreview)
G.Guccione+,PRL(2013)
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Introduc-on
自由度と安定性
2016/01/27 修士論文審査会 22
自由度 水平(x,y)並進 鉛直(z)並進 x, y軸回転 z軸回転
復元力 サンドイッチ構成の復元力 光バネ 重力 なし
模式図
Ø 浮上鏡の曲率中心の運動(並進3自由度,回転3自由度)
dxdF
dβmg
z z z
Levitated mirror
dF
dβmg
dβ
mg
zz
z
o済 済 済
Y.Kuwahara,Masterthesisdefense,UniversityofTokyo(2016)
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• AdvantagesanddisadvantagesofthetwotypeOL:
Introduc-on
• SincethesandwichtypeOLhasnotyetbeenexperimentallydemonstrated,wehavetodoit.– Accordingtorumor,thetripodtypeOLhasbeendemonstratedalreadyinANU.
Y.Kuwahara,Masterthesis,UniversityofTokyo(2016)
![Page 12: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/12.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Purposesoftheop2callevita2onexperiment• Demonstra-ngtheop-callevita-onwithsandwichconfigura-on
• Achievementofthesensi-vityreachingSQL.• Testofthemacroscopicquantummechanics,thedevelopmentofthetechniquetoimprovethesensi-vityofGWdetectors,suchasKAGRA,andothersciences.
(andEduca-onofmyselfandjuniorstudents.)
Introduc-on
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Atfirst,letmedivideourOLexperimentintofourphases.• Phase-0(wearehere)– Confirma-onofthepossibilityofthesandwichtypeOL.(theore-calstudyandR&D)
• Phase-1– Demonstra-onoftheOLwithsandwichconfigura-on.– Nosensi-vityrequirement.
• Phase-2– Achievementofthesensi-vityreachingSQL.
• Phase-3– Testofthemacroscopicquantummechanicsandthedevelopmentofthetechniquetoimprovethesensi-vityofGWdetectors.
Schedule
![Page 14: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/14.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(8m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper:deskwork
:labwork:exci-ngbutuncertainwork
![Page 15: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/15.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(9m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper
![Page 16: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/16.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(9m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper
![Page 17: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/17.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Atfirst,letmedivideourOLexperimentintofourphases.• Phase-0(wearehere)– Confirma-onofthepossibilityofthesandwichtypeOL.(theore-calstudyandR&D)
• Phase-1– Demonstra-onoftheOLwithsandwichconfigura-on.– Nosensi-vityrequirement.
• Phase-2– Achievementofthesensi-vityreachingSQL.
• Phase-3– Testofthemacroscopicquantummechanicsandthedevelopmentofthetechniquetoimprovethesensi-vityofGWdetectors.
Applica-onsofop-callevita-ons
![Page 18: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/18.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(8m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper:deskwork
:labwork:exci-ngbutuncertainwork
![Page 19: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/19.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Applica-onsofop-callevita-ons
光学浮上の応用先 • 古典力学と量子力学を繋ぐモデルの検証
R. Penrose: Gen. Rel. Grav. 28, 1572 (1996) A. Bassi+: Rev. Mod. Phys. 85, 471 (2013)
• 重力デコヒーレンスの観測 R. Kaltenbaek+: Experimental Astronomy 34, 123 (2012)
• 巨視的量子現象 エンタングルメント、Schrödingerの猫 etc.
• 超高精度力センサ(~10-20 N/rtHz) 重力逆二乗則の検証、Casimir力 A. A. Geraci+: PRL 105, 101101 (2010) 重力波検出 A. Arvanitaki, A. A. Geraci: PRL 110, 071105 (2013)
• 量子情報的な応用(回転の自由度を利用)
4
•
Y.Michimura,Seminarslide
![Page 20: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/20.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Applica-onsofop-callevita-ons
光学浮上の応用先 • 古典力学と量子力学を繋ぐモデルの検証
R. Penrose: Gen. Rel. Grav. 28, 1572 (1996) A. Bassi+: Rev. Mod. Phys. 85, 471 (2013)
• 重力デコヒーレンスの観測 R. Kaltenbaek+: Experimental Astronomy 34, 123 (2012)
• 巨視的量子現象 エンタングルメント、Schrödingerの猫 etc.
• 超高精度力センサ(~10-20 N/rtHz) 重力逆二乗則の検証、Casimir力 A. A. Geraci+: PRL 105, 101101 (2010) 重力波検出 A. Arvanitaki, A. A. Geraci: PRL 110, 071105 (2013)
• 量子情報的な応用(回転の自由度を利用)
4
•
Testofmacroscopicquantummechanics
Y.Michimura,Seminarslide
![Page 21: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/21.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Applica-onsofop-callevita-ons
提案されている検証方法
2016/01/27 修士論文審査会 9
Ø 巨視的な物体では,直接二重スリット実験をする代わりにそれに相当する実験をし,重ね合わせが生じるかどうか検証する。Ø SQLへの到達が必要条件
LASER
PD PD
FI BS
com. mode diff. mode
com. mode
com. mode
diff. mode
diff. modedark portbright port
PRM Single photon
PD PD
FI
BS
source
Ground state mirror
|1⟩
|0⟩m or |1⟩m
|0⟩U or |1⟩U
|0⟩R or |1⟩R
Müller-Ebhardt+(2008) Marshall+(2003)
SQLに到達した振動子
同相モードと差動モードの重ねあわせ状態を観測
基底状態の振動子(SQL到達が必要)→ 単一光子で励起
単一光子源
振動子の orの重ねあわせ状態を観測
0m
1m
Y.Kuwahara,Masterthesisdefense,UniversityofTokyo(2016)
![Page 22: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/22.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Applica-onsofop-callevita-ons
光学浮上の応用先 • 古典力学と量子力学を繋ぐモデルの検証
R. Penrose: Gen. Rel. Grav. 28, 1572 (1996) A. Bassi+: Rev. Mod. Phys. 85, 471 (2013)
• 重力デコヒーレンスの観測 R. Kaltenbaek+: Experimental Astronomy 34, 123 (2012)
• 巨視的量子現象 エンタングルメント、Schrödingerの猫 etc.
• 超高精度力センサ(~10-20 N/rtHz) 重力逆二乗則の検証、Casimir力 A. A. Geraci+: PRL 105, 101101 (2010) 重力波検出 A. Arvanitaki, A. A. Geraci: PRL 110, 071105 (2013)
• 量子情報的な応用(回転の自由度を利用)
4
•
Developmentofthenoisereduc-ontechniqueandGWdetec-on
gravityexperiment
Y.Michimura,Seminarslide
![Page 23: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/23.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Applica-onsofop-callevita-ons
$iĶ°wÈ�ũ(Å�lrũÂŎƲǖǞNJƺŷ2017�1¾16µ)� ūū�
• Ņ�Ƙő?ÛË6\ƘœošŤ�
ő?ÛË6\ƘœošŤƘ�à�
Ĝ←
Ë6\Ƙ��→
��
ǑǕǀƯǞËÛƫƈƎƕƁƘ�
��T�
ÏåœoŝôƫĻŽƎ��ƫuïƊƨƆƕƀƔƁƨ!�
Displacemen
tsen
siWvity[m
/rtHz]�
K.Nagano,Masterthesisdefense,UniversityofTokyo(2017)
![Page 24: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/24.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Atfirst,letmedivideourOLexperimentintofourphases.• Phase-0(wearehere)– Confirma-onofthepossibilityofthesandwichtypeOL.(theore-calstudyandR&D)
• Phase-1– Demonstra-onoftheOLwithsandwichconfigura-on.– Nosensi-vityrequirement.
• Phase-2– Achievementofthesensi-vityreachingSQL.
• Phase-3– Testofthemacroscopicquantummechanicsandthedevelopmentofthetechniquetoimprovethesensi-vityofGWdetectors.
Schedule
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(8m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper:deskwork
:labwork:exci-ngbutuncertainwork
![Page 26: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/26.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Horizontalop-calspringdemonstra-on
ねじれ振り子の利用
2016/01/27 修士論文審査会 28
YAW
完全な自由質点のmg鏡の代わりにねじれ振り子を使用- やわらかい(共振周波数 ~10 mHz)- サンドイッチ構成の微小な復元力 を感じうる
ü ねじれ振り子の運動(YAW)の変化によってサンドイッチ構成の安定性を検証できる - もとの共振周波数からの上昇を観測
ü g程度の鏡を使用できる - 0.5inch, 1inch, etc…
鏡の水平並進
Y.Kuwahara,Masterthesisdefense,UniversityofTokyo(2016)
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AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Atfirst,letmedivideourOLexperimentintofourphases.• Phase-0(wearehere)– Confirma-onofthepossibilityofthesandwichtypeOL.(theore-calstudyandR&D)
• Phase-1– Demonstra-onoftheOLwithsandwichconfigura-on.– Nosensi-vityrequirement.
• Phase-2– Achievementofthesensi-vityreachingSQL.
• Phase-3– Testofthemacroscopicquantummechanicsandthedevelopmentofthetechniquetoimprovethesensi-vityofGWdetectors.
Schedule
![Page 28: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/28.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(8m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper:deskwork
:labwork:exci-ngbutuncertainwork
![Page 29: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/29.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Experimentalconfigura-oninPhase-1-wavelength:1064nm-finesse:700(lower,upper)-inputpower:8.5W(lower)
2.6W(upper)-lev.mirrormass:1.6mg
-r=1.5mm,t=0.1mm-int.reflec-vity:0.9995(lev.)
0.992(l,u)-freq.noise:5x10-3Hz/rtHz
-suspensionreso.freq.:~1Hz-maincavityservoUGF:~20Hz(?)-op-calzenithangle<0.2deg-pressure:10-4Pa
![Page 30: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/30.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Sensi-vityinPhase-1
102 103 104 105 106
Frequency [Hz]
10-20
10-19
10-18
10-17
10-16D
ispl
acem
ent n
oise
spe
ctru
m [m
/rtH
z] SQLquantum noisecoating thermalsubstrate thermalresidual gas thermalfrequency noiseseismic
![Page 31: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/31.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Usethe1.6-mgmirror,whichwehavealready.• Userela-velyhigh-finesse(~700)cavity.• Userela-velysimplelaserstabiliza-onsystem(LSS).• Lightisintroducedtothevacuumchamberthoughtop-calfibers.
• Transmiredlightsinthemaincavi-esareextractedbypolarizingbeamsplirer(PBS)intheothercavi-estodecouplethecavi-es.
• Tokeeptheop-calspringeffect,maincavi-esaresuspendedforvibra-onisola-ontodecreasetheunitygainfrequency(UGF)oftheirservo(~afew10Hz).
• (Ifpossible)usenewdigitalcontrolsystem.
PointsinPhase-1
![Page 32: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/32.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Usethe1.6-mgmirror,whichwehavealready.• Userela-velyhigh-finesse(~700)cavity.• Userela-velysimplelaserstabiliza-onsystem(LSS).• Lightisintroducedtothevacuumchamberthoughtop-calfibers.
• Transmiredlightsinthemaincavi-esareextractedbypolarizingbeamsplirer(PBS)intheothercavi-estodecouplethecavi-es.
• Tokeeptheop-calspringeffect,maincavi-esaresuspendedforvibra-onisola-ontodecreasetheunitygainfrequency(UGF)oftheirservo(~afew10Hz).
• (Ifpossible)usenewdigitalcontrolsystem.
PointsinPhase-1
![Page 33: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/33.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Moku:Lab
hrp://www.liquidinstruments.com ←VenturefromANU
![Page 34: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/34.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Moku:Lab
hrp://www.liquidinstruments.com
NOTE:IfweuseMoku:Labincontrolservo,thefrequencyrangeisabout1MHzbecauseof-medelayalthoughsamplingfrequencyismushhigher.
![Page 35: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/35.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 36: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/36.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 37: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/37.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Zenithanglemisalignmenteffect
mgsinθ
~0.1um~w0/10
~0.5mm
0.2deg
Y.Kuwahara,Masterthesisdefense,UniversityofTokyo(2016)
![Page 38: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/38.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Zenithanglealignment
• 2つの錘を吊るした紐がアイリスを通るようにする • アイリスに通るように上下の入射光軸をアライン • 入射光が浮上鏡の中心(~重心)に当たるよう配置 • 上下共振器の共振が取れるように各鏡をアライン • 移動させても、再び紐がアイリスを通るよう光学系全体の水平度を調整すればよいだけ
アラインメント手順案
18 入射光軸 // 重力 入射光軸 // 共振器軸 入射光軸上に重心
2mm
50cm
2e-3/0.5=4e-3rad~0.2deg
Y.Michimura,Seminarslide
![Page 39: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/39.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Useaccelerometerandgyrosensor.– Accelerometercandetectthegravitydirec-on.– Gyrosensorcandetecttheangledisplacement.
• Comparetheop-calcavityaxiswiththestringofplumb.– SeethetransmiredlightaxiswithIRcameraandscareringsomething.
Otherchoicestoalignop-calzenithangle
!a
scarering
![Page 40: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/40.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 41: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/41.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Doubleop-calspring
-Ordinarycase
-Sandwichcase
![Page 42: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/42.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Coupledcasewasdemonstrated.
Doubleop-calspring
N.Gordon+,“Experimentaldemonstra-onofcoupledop-calsprings,”CQG(2017)
10mprototypeinGlasgow
![Page 43: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/43.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 44: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/44.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Decouplingtwomaincavi-es
orLossy
eg)Thorlabs:high-powercubePBS(PBS12-1064-HP),T=0.988
-CanweuseprisminsteadofPBS?
eg1)Thorlabs:platePBS(PBSW-1064),Tp=0.993,Ts=0.0055(1-Ts=0.9945)
eg2)Thorlabs:plateFPB(FPB1059-43),Tp=0.992,Ts=6e-5(1-Ts=0.99994)
![Page 45: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/45.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 46: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/46.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Levita-ngmirrorsupport
-Ontorsionpendulum -Onfixedstage
![Page 47: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/47.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Advantageoftorsionpendulum– mirrorposi-oncanbeadjusted.– ver-calandhorizontalop-calspringeffectcanbemeasured.
• Disadvantageoftorsionpendulum– mirrorposi-onisnotstablewithoutcontrol.– requirementformirrordisplacementRMS
• ver-cal:<<50pm(freerun:50um)• horizontal:<<0.6um(freerun:1mm)
– verystrongservocontrolanddampingisrequired.– lownoisesensingforrollisalsorequired.
Levita-ngmirrorsupport
![Page 48: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/48.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Sensingmethodoftorsionpendulum
Auxiliarycavity
roll(ver-cal):cavity
magnet
long.(horizontal):photosensor
yaw(horizontal):op-callever
foractua-on(coilmagnet)
fordamping(coil(resistor)magnet)
Auxiliarycavity
trans.(horizontal):photosensor
![Page 49: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/49.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 50: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/50.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Whenthemirrorlevitate,themirror’smechanicalresponseshouldchangedrama-cally.Thus,wecanknowthemirrorlevita-onbymeasuringtheopenlooptransferfunc-on.
• Moreover,ifweaddthelinesignalintothePZTonwhichthemirroris(ortheaux.cavityincidentlightpower)andshakethemirror,– whenthemirrorisnotlevitated,thesignalcanbedetectedwiththemaincavity
– whenthemirrorislevitated,thesignalcanNOTbedetectedwiththemaincavity
Howtodetectthemirrorlevita-on
![Page 51: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/51.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Howtoaligntheop-calzenithangle?• Canweachievethever-caldoubleop-calspringwherethecavi-esdon’tsharetheop-calpath?
• Howtodecouplethetwomaincavi-esfromtheother?
• Howtosupportthelevita-ngmirrorbeforelevita-on?
• Howtoknowthemirrorislevitated?• Howtosuspendtheop-calbenchonwhichthemaincavi-esare?
Problems(?)inPhase-1
![Page 52: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/52.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Bladespringorspring?
-Bladespring -Spring
or
-Targetresonantfrequencyis1Hzforhorizontalandver-cal.
![Page 53: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/53.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Notconsideredproblems– Howtomakeastabledetuning.– Vacuumsystem.
• Todo– Buildlaserpoweramplitudesystem.– Makefreq.referenceforfreq.stabiliza-on.– DesignLSS,suspension,op-csarrangement.– (Buildnewdigitalsystem.)
• Tobuy– Fiberop-cscompa-blewith1064-nmlaser.
• fiber(coveredandbare),EOMx2,AOMx2,fiberop-cs(BS,collimator,FI,andsoon),fiberfeedthrough,fiberamp.,(lasersource?),andsoon.
– Cavitymirror(formainandaux.)– Suspensionsystemandop-calbench.
OtherthingsinPhase-1
![Page 54: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/54.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Atfirst,letmedivideourOLexperimentintofourphases.• Phase-0(wearehere)– Confirma-onofthepossibilityofthesandwichtypeOL.(theore-calstudyandR&D)
• Phase-1– Demonstra-onoftheOLwithsandwichconfigura-on.– Nosensi-vityrequirement.
• Phase-2– Achievementofthesensi-vityreachingSQL.
• Phase-3– Testofthemacroscopicquantummechanicsandthedevelopmentofthetechniquetoimprovethesensi-vityofGWdetectors.
Schedule
![Page 55: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/55.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
ScheduleH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(8m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper:deskwork
:labwork:exci-ngbutuncertainwork
![Page 56: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/56.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Experimentalconfigura-oninPhase-2-wavelength:1064nm-finesse:100(lower,upper)-inputpower:10W(lower)
2.1W(upper)-lev.mirrormass:0.2mg-int.reflec-vity:0.975(lev.)
0.962(l,u)-freq.ref.:asymmetricFMI
-Passivestabilizingcavity(doublepass)--length:3m(FSR:100MHz)--finesse:3x104--cavitypole:1.6kHz--Intracavitypower:~300kW!!
![Page 57: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/57.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Sensi-vityinPhase-2
102 103 104 105 106
Frequency [Hz]
10-20
10-19
10-18
10-17
10-16D
ispl
acem
ent n
oise
spe
ctru
m [m
/rtH
z] SQLquantum noisecoating thermalsubstrate thermalresidual gas thermalfrequency noiseseismic
![Page 58: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/58.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Usenew0.2-mgmirror.• Use100-masymmetricfiberMichelsoninterferometer(AFMI)forfrequencystabiliza-onaround10kHz.
• Usepassivelaserstabilizingcavity(PSC),thatisthecavitywithlowcavitypole(~1kHz).
• Togeteffec-ve(2ndorder)passivelaserstabiliza-on,thetransmiredlightisreflectedbacktothePSC.(Double-passconfigura-on)
PointsinPhase-2
![Page 59: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/59.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 60: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/60.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 61: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/61.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Assmallaspossiblemirrorisberer.• About1-mgmirrormaybeupperlimit,consideringfeasibleincidentpower(lower:40W,upper:12W,finesse100).
Massoflevitatedmirror
102 103 104 105 106
Frequency [Hz]
10-20
10-19
10-18
10-17
10-16
Dis
plac
emen
t noi
se s
pect
rum
[m/rt
Hz] SQL
quantum noisecoating thermalsubstrate thermalresidual gas thermalfrequency noiseseismic
![Page 62: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/62.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 63: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/63.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
AFMIvsReferencecavity
or
K.Nagano,Masterthesis,UniversityofTokyo(2017)
S(?).Takahashi,Masterthesis,UniversityofTokyo(2008)
![Page 64: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/64.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Requirementofthefrequencynoiseis1x10-4Hz/rtHzat10kHz.
• Fortheac-vestabiliza-on,itisrelaxedtobe~5x10-3Hz/rtHzat10kHzthankstothePSC.
• Displacementsensi-vityrequirement.– ForAFMI(with100-masymmetry)
• xAFMI=1.7x10-15m/rtHz– Forreferencecavity(cavitylength20cm)
• xRC=3.3x10-18m/rtHz– Suspendedmirrorcavity(likeKAGRA’sinputmodecleaner)canbeused?
AFMIvsReferencecavity
![Page 65: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/65.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
AsymmetricfiberMIsensi-vity
NOTE:Inthismeasurement,lasersourcewas1550-nmDFBfiberlaser,whichmaybemorenoisythan1064-nmNPROlaser.
S(?).Takahashi,Masterthesis,UniversityofTokyo(2008)
NOTE2:Asymmetrywas100m.
![Page 66: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/66.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
AsymmetricfiberMIsensi-vity
NOTE:Inthismeasurement,lasersourcewas1540-nmRIOfiberlaser,whichismorenoisythan1064-nmNPROlaser.
R.Šmíd+,“FrequencyNoiseSuppressionofaSingleModeLaserwithanUnbalancedFiberInterferometerforSubnanometerInterferometry,“Sensors(2015)
NOTE2:Asymmetrywas2.09km.
![Page 67: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/67.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 68: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/68.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Circula-ngpowerinPSCwillbeverylarge,morethan100kW.– Forexample,circula-ngpowerinKAGRA’sPMCwithhighpower(~100W)laserislessthan10kW.
– Withpulselaser(10psand250MHzrepe--onrate),670kWofaveragepowerwasdemonstrated.
• IsitOK?Orcanweresolveit?– Makebeamsizelarge?(smallerintensity)– Makelongercavity?(smallerfinesse)– Coolthecavitywithliquidnitrogen?
• Anyway,verycarefultreatmentisrequiredtoavoidcontamina-on,forexampledust.
Circula-ngpowerinPSC
H.Carstens+,Opt.Ler.(2014)
![Page 69: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/69.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 70: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/70.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 71: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/71.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Such(0.2-mg)smallmirrorcanbemade?• Isthefrequencystabiliza-onusingAFMIat10kHzpossible?
• Circula-ngpowerinthePSCismorethan100kWwhichcouldburnitsmirrors.
• EffectofthedisplacementofPSContheeffectofthepassivestabilizingshouldbeconsidered.
• Sincecavitypoleofmaincavi-esisveryhigh(~8MHz),RFsidebandcanenterthecavi-estosomeextent.
• IsthereanysciencewhichcanbedoneusingonlyonecavityreachingSQL?
ProblemsinPhase-2
![Page 72: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/72.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Allscienceideasusingop-callevita-onwhichIhavesofarrequiretwocavi-esreachingSQL.
• However,ittakesalotof-meandefforttobuildanothercavity.
• ThusI’dliketodosomescien-ficworkswithonlyonecavityreachingSQL.
• Ibelieveinteres-ngsciencemustexist.• Ifyouhaveanyidea,pleaseshareitwithme.
Scienceofop-callevita-onexperiment
![Page 73: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/73.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
• Notconsideredproblems– Theeffectoftheuppercavity’sradia-onpressurenoise.
• Todo– Designsuspension,op-csarrangement.– Discussthepossibilityofthesmallmirrorwithmanufacturingcompany(Sigma,LMS,…).
• Tobuy– Newsmallmirror,cavitymirrors.
OtherthingsinPhase-2
![Page 74: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/74.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
Conclusion
![Page 75: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/75.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
4 6 8 10 12 2 4 6 8 10 12 2 4 8 12 3
Phase-0
Phase-1
Phase-2
Phase-3
SummaryH29 (D1) H30 (D2) X (D3)
theore-calstudy
hor.stab.demo.
designsetupmechanics,op-cs,alignmentmethod
aux.cavitystudy
buildsetuplevitate1.6-mgmir.!
(3m)
(6m)(6m)
modifydesign
buynewmir.(1m)
designsetupchecknewmir.
check1.6-mgmir.
(6m)
reachSQL!!
writepaper
re-buildsetup(6m)
fiberMItest(8m) buildandtestLSS(6m)
(2m) writepaper
writepaperbuyitems
buildanothersetup(3m) enjoyscience!!!
writethesis
writepaper:deskwork
:labwork:exci-ngbutuncertainwork
![Page 76: Future prospects of the op-cal levita-on experiment · 2017-04-28 · Future prospects of the op-cal levita-on experiment ( ) KAGRA observatory, Ins-tute for cosmic ray research,](https://reader034.vdocuments.mx/reader034/viewer/2022050412/5f88f898f81e095ce93f213e/html5/thumbnails/76.jpg)
AndoLabChukanseminar(TheUniversityofTokyo,Hongo,Apr.27,2017)
End