high-energy burst mode thin-disk multipass amplifier for
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High-energy burst mode thin-disk multipass amplifier
for laser Compton X-ray sourceSiva Sankar Nagisetty1,2, Michal Chyla1, Martin Smrž1, Akira Endo1 and Tomáš Mocek1
1) HiLASE Centre, Institute of Physics AS CR, v.v.i. Za Radnicí 828, Dolní Břežany 252 41, Czech Republic2) Czech Technical University in Prague, Břehová 7, Prague 115 19, Czech Republic
Laser Compton back scattering
X ray photon number
λp : peak X ray wavelength
Ne : total electron number
Np : total laser photon number
r : interaction cross section
Bea
m r
adiu
s [µ
m]
Thin disk laser development
Multipass amplifier design
PERLA B laser system
5mJ @ 10 kHz, 50 mJ/burst,
o-o eff.27%pulse duration ~1ns
High energy, short pulse 2ps, high beam quality M2<1.5 laser beam
ACKNOWLEDGMENT This poster was co financed by the European Regional development Fund and the state budget of the Czech Republic (project HiLASE CoE: Grant No. CZ.02.1.01/0.0/0.0/15_006/0000674) and by the European Union’s Horizon
2020 research and innovation programme under garnt agreement No. 739573. This work was also supported by the Ministry of Education, Youth and Sports of the Czech Republic (Programmes NPU I Project No. LO1602, Large Research Infrastructure
Project No. LM2015086), and by the Czech Science Foundation (GACR) under project No. GA16-12960S
Diamond bonded disk ROC-20m
Thickness 140 µm. Diameter 17mm
Bevel 0.1º. Doping concentration 11%
Seed energy 10mJ/10 pulses. Rep. rate 10kHz
Pump power 2kW. Rep. rate 100Hz
Pump spot 7.5mm
Pre-pumping time 350µsec
24 passes (12 reflections) on disk
Atomic Diffusion Bonding thin disk
500W and 5kW Thin disk heads
Output energy in free running mode with pulsed
pumping using 5kW thin disk head
Fiber
front-end
CFBG
stretcher
AOM pulse
picker 10kHz
Burst thin disk
regenerative
amplifier
AOM pulse
picker
10kHz@100Hz
Burst thin disk
multipass
amplifier
Grating
pulse
compressor
50 mJ
Conclusion
Non-Lasing surface temperature of soldered and
ADB disk
Burst pulse amplification in one pump pulse
Burst energy and single pass gain
dependence on No. of reflectionsSingle pass gain dependence on pump spot
fill factor (mode size/pump spot)
Thin disk multipass amplifier schematic
Mirror array
Nearly collimated seed beam propagation with in the multipass amplifier with 12 reflections on thin disk TD
PERLA B Thin disk laser system layout
Regenerative amplifier
CW 50 W, o-o eff.47%
Amplification of single pulse with in burst
Ring cavity regenerative
amplifier with two disks is under
development
FWHM 1.46 nm
central 1030.4 nm
Regenerative amplifier: Linear cavity 50 mJ/burst, Ring cavity under construction to increase the output up to 10mJ at 10kHz. Multipass amplifier design with mirror array for amplification up to 650 mJ/burst.
Simulated the multipass amplifier and tested the mirror array; awaiting thin-disk. Improvement of the code with ASE and heat distribution. Seeding the multipass amplifier with 10mJ pulses in burst and obtain
650mJ/burst
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