物理学报2012，Vol.61Issue(12)：234-241,8.
采用透镜列阵与光谱色散改善三倍频小焦斑辐照均匀性
Smoothing of small on-target spots produced by frequency-tripled beams using lens array and spectral dispersion
摘要
Abstract
The performances of the smoothing of small target spots with a lens array （LA） and two-dimensional smoothing by spectral dispersion （2-D SSD） in frequency-tripled high-power laser driver are numerically studied. Intensity distributions and spatial power spectra of the spots are analyzed. Simulative results show that LA can reduce the near-field nonuniformity of the beam and control the envelope of on-target intensity distribution. The 2-D SSD has obvious effects in eliminating high-contrast intensity modulation, even in the case that the spots are very small. The results indicate that SSD mainly smoothes the intensity modulation at low-to-middle spatial frequency for small spots, and this would lead to the modifying of the spot profile, while for large spots, SSD sweeps the fine speckle structure to reduce nonuniformity at middle-to-high frequency. These results are valuable for choosing the suitable beam smoothing method in indirect-drive experiment.关键词
高功率激光驱动器/靶面均匀辐照/透镜列阵/光谱色散匀滑Key words
high-power laser driver/uniform irradiation/lens array/smoothing by spectral dispersion分类
数理科学引用本文复制引用
江秀娟,李菁辉,李华刚,周申蕾,李扬,林尊琪..采用透镜列阵与光谱色散改善三倍频小焦斑辐照均匀性[J].物理学报,2012,61(12):234-241,8.基金项目
中国科学院高功率激光物理重点实验室开放基金（批准号：SG-001103）资助的课题. （）
