中国物理B ›› 2015, Vol. 24 ›› Issue (5): 54209-054209.doi: 10.1088/1674-1056/24/5/054209
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
孙晓艳a b, 卢兴强a, 吕凤年a, 张国文a, 张臻a, 尹宪华a, 范滇元a
Sun Xiao-Yan (孙晓艳)a b, Lu Xing-Qiang (卢兴强)a, Lü Feng-Nian (吕凤年)a, Zhang Guo-Wen (张国文)a, Zhang Zhen (张臻)a, Yin Xian-Hua (尹宪华)a, Fan Dian-Yuan (范滇元)a
摘要:
The high-power laser beam in the final optics assembly of high-power laser facilities is often modulated by contamination particles, which may cause local high light intensity, thereby increasing the filamentary damage probability for optical components. To study the general design basis for a final optics assembly to decrease the risk of filamentary damage, different-sized contamination particles deposited on a component surface are simulated to modulate a 351-nm laser beam based on the optical transmission theory, and the corresponding simulation results are analyzed statistically in terms of the propagation characteristic and the light field intensity distribution of the modulated laser beam. The statistical results show that component thickness and distance between components can to some extent be optimized to reduce the appearance of local high light intensity, and the general design basis of component thickness and arrangement are given for different control levels of particle sizes. Moreover, the statistical results can also predict the laser beam quality approximately under the existing optics design and environmental cleanliness. The optimized design for final optics assembly based on environmental cleanliness level is useful to prolong the lifetime of optics and enhance the output power of high-power laser facilities.
中图分类号: (Laser optical systems: design and operation)