Infrared and Laser Engineering, Volume. 50, Issue 10, 20200461(2021)
Gain and laser output performance of JG2 Nd: glass in 400 mm aperture slab amplifier
Figures & Tables(10)
Fig. 1. (a) Scheme of the 4×2 multi-slab amplifiers (MSA) with 400 mm aperture and (b) section view of the MSA
Fig. 5. Near field of laser output of the main amplifiers (18.2 kJ/5 ns/1 053 nm). (a) 3-D outline; (b) 2-D outline; (c) 1-D outline
Table 1. Main laser physical parameters of JG2 Nd:glass
View tableView in ArticleTable 1. Main laser physical parameters of JG2 Nd:glass
Parameter Value Typical size/mm3 810×460×40 Thickness of cladding glass/mm ~12 Coefficient of absorption of cladding glass (1 053 nm)/cm−1 2.8±0.2 Nd concentration/1020 ions·cm−3 4.2±0.1 Cross section/10−20 cm−2 3.6±0.1 Fluorescence lifetime/μs 305 n linear refractive index (1053 nm) 1.520 n2 nonlinear refractive index/10−13 esu 1.05
Table 2. Technical parameters of the scheme
View tableView in ArticleTable 2. Technical parameters of the scheme
Parameter Value Pre-ionized voltage/kV 26 Work voltage/kV 31 Peak current/kA 17 Delay between work and pre-ionization/μs 250 Current pulse width（10%-10%） 450 Flashlamp numbers every circuit 2 Pumping circuit numbers every amplifier 20 Flashlamp diameter/mm 37 Flashlamp arc length/mm 1 850 Flashlamp gas pressure/Torr 180
Table 3. Main characteristic parameters of Integration-Test-Bed （ITB） laser facility
View tableView in ArticleTable 3. Main characteristic parameters of Integration-Test-Bed （ITB） laser facility
Parameter Value Number of the laser beam 1 Laser aperture Square，max: 375 mm×375 mm Number of the amplifers Main amplifier: 9，booster amplifier: 7 Working voltage/kV Convention: 21 kV，max: 24 kV Work pattern Impulse work，the interval of delivery is about 2 h Operating wavelength/nm 1053 nm，after the frequency doubling is 351 nm Time waveform The typical working waveform is square pulse, and the pulse can be shaped arbitrarily
Table 4. Comparison of main performance parameters
View tableView in ArticleTable 4. Comparison of main performance parameters
Parameter JG2 NIF laser facility in USA（LHG8/LG770） Aperture Square，max:400 mm×400 mm Square，max: 400 mm×400 mm Nd concentration/1020 ions·cm−3 4.2±0.1 4.2±0.1 Cross section/10−20 cm−2 3.6±0.1 3.6±0.1（LHG-8）;3.9±0.1（LG770） Fluorescence lifetime/μs 305 ≥300 Small gain coefficient/cm−1 5.37% ~5% (convention)；~5.3% （max） Multiple of small gain/slab·pass−1 1.284 1.29 Energy density/J·cm−3 0.282 0.252 (convention)；0.267 （max） Output energy for conventional operation/kJ (1053 nm) 18 18 Maximum output energy/kJ (1053 nm) 21.3 ~22 Thermal recovery time/h 2 h (Operating frequency of the device is 4 h) (Operating frequency of the device is 4 h)
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Lin Chen, Wenlong Wu, Junpu Zhao, Zhenguo Wang, Qiang Liu. Gain and laser output performance of JG2 Nd: glass in 400 mm aperture slab amplifier[J]. Infrared and Laser Engineering, 2021, 50(10): 20200461
Paper Information
Category: Lasers & Laser optics
Received: Nov. 30, 2020
Accepted: --
Published Online: Dec. 7, 2021
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