Jiamei Li, Dawei Li, Tao Wang, Hui Yu, Guang Xu, Li Wang, Xingqiang Lu. Influence of Chromatic Aberration of Large Aperture Lens on Focusing Spatiotemporal Characteristics in Multi-Pass Nd∶Glass Petawatt Laser[J]. Laser & Optoelectronics Progress, 2024, 61(9): 0932001
- Laser & Optoelectronics Progress
- Vol. 61, Issue 9, 0932001 (2024)
Fig. 1. Diffraction transmission schematic of beam after passing through a single lens. (a) Schematic of diffraction transmission; (b) schematic of lens structure
Fig. 2. Schematic of broadband laser pulse transformation by a lens. (a) Without considering GVD; (b) considering GVD
Fig. 3. Schematic of beam radius selection
Fig. 4. Layout diagram of high-energy Nd:glass petawatt laser facility with multi-pass amplification structure
Fig. 5. Influence of different PTD/T on focal spot distribution. (a), (b), (c), and (d) are 3D distributions of spatiotemporal characteristics of focal spot at PTD/T = 0, 1, 3, and 5, respectively; (e), (f), (g), and (h) are iso-intensity curves of focal spot at PTD/T = 0, 1, 3, and 5, respectively
Fig. 6. Variations of focal spot characteristics with different PTDs. (a) Far-field pulse shape; (b) relative intensities of spatial focal spots; (c) energy concentrations of focal spots
Fig. 7. Spatiotemporal characteristics of focal spot under different compression pulse widths with injecting laser of 3.2 nm broadband and ideal beam quality of 1 DL, and when PTD is 2.5 ps. (a) T=0.5 ps; (b) T=1 ps; (c) T=5 ps; (d) T=10 ps
Fig. 8. Focal spot characteristics under different compression pulse widths. (a) Spectrum distribution of focal point; (b) spatial waveform of focal spot; (c) temporal waveform of focal spot
Fig. 9. Influence of PTD on focal spot under different injected beam qualities. (a), (b), (c), and (d) are spatiotemporal characteristics of focal spot when beam qualities are 1 DL, 3 DL, 5 DL, and 7 DL, respectively; (e) comparison of temporal waveform after spatial integration
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Table 1. Lens parameters of laser system and PTD produced by lens
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