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High energy classsecond harmonics generationfrom CLBO by 20-J DPSSLTakashi Sekine, Hiroshi Sakai, Yasuki Takeuchi, Yuma Hatano, Toshiyuki Kawashima, Hirofumi Kan
7th International HEC-DPSSL Workshop
September 14, 2012
Lake Tahoe, California
HamamatsuHamamatsu Photonics K. K.Photonics K. K.
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Outline
• Introduction of Hamamatsu Photonics K. K.
• HALNA program at ILE, Osaka University
• KURE-I green DPSSL by CLBO at Hamamatsu
• Summary
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Introduce of Hamamatsu-City
Tokyo
Fukushima
Hiroshima
Osaka
Osaka
Tokyo
300km
NagoyaMt. Fuji
Shinkansen
300km
Hamamatsu
Industries in HamamatsuAuto mobile: SUZUKI, HONDA, Yamaha Motor
Musical instrument: KAWAI, Roland, YAMAHA
Photonics device: Hamamatsu Photonics
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Established: September, 1953Established: September, 1953Capital: 34 billion yenCapital: 34 billion yenSales: Sales: 10100 billion yen0 billion yenEmployee: 4,100Employee: 4,100
Profile of Hamamatsu Photonics group
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We have played a role in Neutrino ScienceWe have played a role in Neutrino ScienceThe Kamiokande captured the total of 1016
neutrinos that passed through the detector.This has led to unexpected discoveries and a new, intensive new field of research, neutrino-astronomy. The Super-Kamiokande, and the consequent KamLAND also equips the improved HAMAMATSU photo-multiplier tubes.
Kamioka Observatory, ICRR(Institute for Cosmic Ray Research), The University of Tokyo
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Photo-multipliers
Semiconductor lasers
Photo-sensors
Optical measurement Medical diagnostics
Products of Hamamatsu Photonics
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Laser system products Direct Diode Laser Fiber out Laser Diode Quantum Cascade Laser
Stealth Dicing LaserFiber Disk Laser Pico-second Laser
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Direct processing
of atoms
Neutron generation
Annealing
Dicing
10-15 10-12 10-9 10-6 10-3 1
Pow
er d
ensi
ty (W
/cm
2 )
1021
1018
1015
1012
109
106
103
Drilling
Non-thermal
processing
Cutting, Welding
Hardening
Pulse width (ns)
Peening
IFEIFE
Continuous wave
Single pulse
Repetitive pulse
HECHEC--DPSSLDPSSL
Development of Photonics Industriesby DPSSL at Hamamatsu
CuttingCurrent
Inertial Fusion
Welding
Wafer dicing
Si annealing
Future
Neutron therapy
Neutron imaging
Transmutation
Next
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Conceptual design of HALNA ILE OSAKAILE OSAKA
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HALNA 10 (8.4 J in 20 ns at 10 Hz)Glass volume:2.2cm x 1cm x 40cm(1 slab)Stored at 0.4 J/cm3
HALNA 100 (100 J in 10 ns at 10 Hz)(December 2004) (Current status)
Glass volume:10cm x 1cm x 40cm(2 slabs)Stored at 0.4 J/cm3
Half scale (21.3 J in 8.9 ns at 10 Hz)
ILE OSAKAILE OSAKAILE OSAKA
Current status of HALNA
5 cm x 1cm x 40cm(2 slabs)Stored at 0.2 J/cm3
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Diode pumped green laser KURE-I
>10%Opt. to opt. eff.
>14JOutput energy10 HzRepetition rate527 nmWavelength>70%
Specifications
SHG conv. eff.
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Nd:YLF regen.amplifirier
Yb:fiberoscillator
Deformable mirror
Up collimating telescope
Image-relaying telescope / Spatial filter
Diode-pumpedslab amplifier
Beam shaping
Faraday rotator
Faraday isolator
Laser output
再 生 増 幅 部
発 振 器 部
主 増 幅 部
波 長 変 換 部
Frequency doublerRegen.
Amp.
Osc.
Detail layout of Main Amp.
SHG
KURE-I system
Pre. Amp. LD module Main laser head
Deformable mirror
Frequency doubler
Peak power 200kW/moduleWavelength 803 nmEfficiency > 50%
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Current status of fundamental output
0
5
10
15
20
25
30
0 20 40 60 80 100 120 140 160
LD current (A)
Out
put e
nerg
y (J
)
0.0
0.2
0.4
0.6
0.8
1.0
Extraction efficiency
CalculationExperiment
Repetition rate:1 Hz
21.4 J1 HzRepetition rate
41.6%Extraction eff.14.7%Opt. to opt. eff.
Output energyFFP
NFP
Design>20% at 32J output with 160J pump
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Strong
5.6
43>500.95
CLBO
StrongSlightlyNonHygroscopicity
1.3
65>800.91
YCOB
5.51.1Spectral bandwidth (nm)
6.755Temperature bandwidth (deg.C)
0.41.94Effective nonlinear coefficient (pm/V)~30
BBO
>400Maximum aperture (mm)
DKDP
Characteristics of CeLiB6O10(CLBO) nonlinear crystal
CLBO ingot Cut and polish N2 purged mount40mm
40m
m
14mmtNon AR coatingon the CLBO’s face
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Design of frequency doublerEvaluation of phase mismatch
V.G.Dimitriev et. al. , "Handbook of Nonlinear Optical Crystals"1 W/mKThermal conductivity
70%SHG conv. eff.
0.001 cm-1Absorption coefficient
20 JInput energy
10 HzRepetition rate
10 ns (FWHM)Pulse width (Gaussian)
0.2 mrad
Design parameter
Angular mismatch
0 angl spec thempk k T
Frequency conversion sensitivity
angle spectrum temperature
1.772L Bandwidth
Bandwidth
Second
harmonics
Temperature
z:Position in lenagth
Face cooling
Fundamental
Line width
Nonlinear Crystal
Incident angle
Beam divergence 0
0.2
0.4
0.6
0.8
1
0 2 4 6 8 10 12 14 16 18 20Crystal length (mm)
Con
vers
ion
effic
ienc
y
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Fiber laserbased frontend
LD pumped Nd:YLF ring preamplifier
LD pumpedNd:glass zig-zag
slab main amplifier
CLBO frequency doublar
Output
AT
VSF
VT
CCD HA
DM1DM2
IP
IP IP IP
IP
IP CLBO
QR
WBD
EM1
EM2Input
BD
16mm
22m
m
8mm
44m
m
Optical setup of SHG and diagnostics~nJ 300mJ 20J 14J
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02468
10121416
0 5 10 15 20Fundamental pulse energy (J)
Seco
nd h
arm
onic
puls
e en
ergy
(J)
00.10.20.30.40.50.60.70.8
Conversionefficiency
0
256
64
192
128
Output characteristics of SHG
There is no significant reduction of conversion efficiency by exposing over 600,000 shots fpr intermissive experiments during 3 years.
Filling factor:44.2%
•NFP
•12.5 J with 71.5%
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0.1 mradBeam divergence
0.1 mradAngular mismatch
SingleLongitudinal mode
10 HzRepetition rate
10 ns (FWHM)Pulse width (Gaussian)
10 cm x 10 cmBeam size
0.0013 cm-1
(Assumed same with DKDP)Absorption coefficient at 1um
1.25 W/mK(Assumed same with DKDP)
Thermal conductivity
9 mmCrystal length
Type-IIPhase match type
CLBOParameter
Prospect of kJ class SHG by CLBO
0
0.2
0.4
0.6
0.8
1
0 200 400 600 800 1000Input energy (J)
Con
vers
ion
effic
ienc
y
CLBO 10Hz Rep.
CLBO Single shot
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SummarySummary
• CLBO frequency doubler has been developed for HEC-DPSSL.
• 12.5 J with 71.5% conversion efficiency has been demonstrated.
• Prospect of frequency converter for 1 kJ x 10Hz by CLBO was evaluated.