High Power Laser Science and Engineering, Volume. 12, Issue 2, 02000e14(2024)
High-repetition-rate and high-power efficient picosecond thin-disk regenerative amplifier
Figures & Tables(10)
Fig. 1. Optical scheme of the regenerative amplifier. HWP, half-wave plate; QWP, quarter-wave plate; TFP1, TFP2, thin film polarizer; PC, Pockels cell; M1, M2, M5–M8, mirror; M3, M4, concave mirror.
Fig. 2. Thin-disk laser systems: (a) 48-pass pump system and (b) beam radius of the regenerative cavity.
Fig. 3. FEM model for thin-disk Yb:YAG. (a) Mesh model and structure of the cooling system. (b) Temperature distribution.
Fig. 4. Pump spot on the disk. (a) Pump profile. (b) Line-out. (c) Temperature distribution versus pump intensity. (d) Image from an infrared thermal camera.
Fig. 5. Power characteristics of the thin-disk regenerative amplifier. (a) Pump power versus output power and efficiency at 1 MHz. (b) Average power and pulse energy at the maximum power versus repetition rate.
Fig. 6. Temporal characteristics of the thin-disk regenerative amplifier. (a) Intracavity pulse build-up;
Fig. 7. (a) Measured autocorrelation traces of the amplified pulses. (b) Optical spectrum of the amplifier.
Fig. 8. (a) Beam quality of the laser at 154.1 W. (b) Power stability of the laser at 154.1 W.
Table 1. Summary of published results from thin-disk regenerative amplifiers.
View tableView in ArticleTable 1. Summary of published results from thin-disk regenerative amplifiers.
Av. power (W) PRF/kHz Pulse width (ps) M 2 Pump power Opt-opt eff. Ref. 0.12 1 2.3 / 8 W@940 nm 1.5% [ 18 ]75 3 1.6 1.1 284 W@940 nm 26.4% [ 24 ]24 0.1 1.8 1.04 133 W@940 nm 18.0% [ 25 ]126 200 800 1.42 1.2 kW@940 nm 10.5% [ 26 ]56 200 0.534 1.24 150 W@969 nm 37.3% [ 27 ]550 92 2 1.4 1.25 kW@969 nm 44.0% [ 20 ]1950 20 0.8 / 4.5 kW@969 nm 43.3% [ 23 ]150 1000 6 <1.3 330 W@969 nm 45.4% [ 28 ]154 1000 6.82 1.06 260 W@969 nm 61.0% This work
Table 2. Thermo-mechanical properties of materials for the FEM[31].
View tableView in ArticleTable 2. Thermo-mechanical properties of materials for the FEM[31].
Material Thermal conductivity (W/(m K)) Coefficient of thermal expansion (K−1) Density (kg/m3) Coolant temperature (K) Yb:YAG 6.5 6.3 × 10−6 4776.6 300 Diamond 1800 1 × 10−6 3515.0 Copper 388 1.7 × 10−5 8936.8
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Sizhi Xu, Yubo Gao, Xing Liu, Yewang Chen, Deqin Ouyang, Junqing Zhao, Minqiu Liu, Xu Wu, Chunyu Guo, Cangtao Zhou, Qitao Lue, Shuangchen Ruan. High-repetition-rate and high-power efficient picosecond thin-disk regenerative amplifier[J]. High Power Laser Science and Engineering, 2024, 12(2): 02000e14
Paper Information
Category: Research Articles
Received: Sep. 20, 2023
Accepted: Dec. 7, 2023
Posted: Dec. 8, 2023
Published Online: Mar. 29, 2024
The Author Email: Xing Liu (liuxing@sztu.edu.cn), Shuangchen Ruan (scruan@sztu.edu.cn)
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