high energy class second harmonics generation from clbo by 20 … · 2012-09-27 · v.g.dimitriev...
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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.
Outline
• Introduction of Hamamatsu Photonics K. K.
• HALNA program at ILE, Osaka University
• KURE-I green DPSSL by CLBO at Hamamatsu
• Summary
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
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
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
Photo-multipliers
Semiconductor lasers
Photo-sensors
Optical measurement Medical diagnostics
Products of Hamamatsu Photonics
Laser system products Direct Diode Laser Fiber out Laser Diode Quantum Cascade Laser
Stealth Dicing LaserFiber Disk Laser Pico-second Laser
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
Conceptual design of HALNA ILE OSAKAILE OSAKA
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
Diode pumped green laser KURE-I
>10%Opt. to opt. eff.
>14JOutput energy10 HzRepetition rate527 nmWavelength>70%
Specifications
SHG conv. eff.
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%
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
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
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
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
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%
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
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.