Proceedings Article | 17 September 2013
Wen-yi Wang, Yuan-Chao Geng, Lin Chen, Yi-ming Luo, Yuan-bin Chen, Jun-pu Zhao, Wan-qing Huang, Ying Zhang, Lan-qin Liu, Kui-xing Zheng, Qi-Hua Zhu, Xiao-feng Wei
Proc. SPIE. 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications
KEYWORDS: Optical amplifiers, Data modeling, Modulation, Laser applications, Laser beam propagation, Near field, Optical simulations, Computer architecture, Pulsed laser operation, Near field optics
optical propagation simulation by SG99 code and invert algorithm has been made for two typical laser architecture,
namely the National Ignition Facility (model A) and SG-III laser facility (model B) based on measured 400mm aperture
Nd:glass slab gain distribution data on ITB system. When the gain nonuniformity is about 5%, 7%, and 9% respectively
within 395x395mm2 aperture and output beam aperture is 360x360mm2, and output energy is about 16kJ/5ns(square)
with B-integral limited, 1ω(1053nm) nearfield modulation is about 1.10, 1.15, and 1.30 respectively for model A (11+7
slab configuration), and 1.07, 1.08, and 1.17 respectively for model B (9+9 slab configuration) without spatial gain
compensation. With the above three gain nonuniformity and slab configuration unchanged, to achieve flat-in-top output
near field, the compensation depth of the input near field is about 1.5:1, 2.0:1, and 6.0:1 respectively for model A, and
1.3:1, 1.4:1, and 3.5:1 respectively for model B. Compared with model A (the beam aperture unchanged in multi-pass
amplification), the influence of slab gain nonuniformity on model B (beam aperture changed) is smaller. All the above
simulation results deserve further experiment study in the future.
