Collection Of theses on high power laser and plasma physics, 2006, 4 (1): 34, Published Online: Jun. 4, 2007
Experimental Study of Smoothing by Spectral Dispersion
激光技术 光谱色散平滑 激光辐照均匀性 色循环 laser technique smoothing by spectral dispersion laser irradiation uniformity color cycle
Abstract
To improve the ability of beam smoothing in the device of inertial confinement fusion (ICF) in China, the theory of smoothing by spectral dispersion (SSD) is studied, and some experiments are carried out to analyze the mechanism of SSD in contrast with another technology of smoothing—distributed phase plane (DPP). It is found that the uniformity of focal spot in direction of dispersion is improved markedly using sinusoidal phase modulation (PM) and dispersion in SSD. And the intensity modulation of focal spot in this direction is smoothed by SSD. According to the experiments results, the changes of spectral intensity of spatial frequency at low-mode are very limited, and at high-mode are obviously; the nonuniformity varies from 40% to 12.5%. The ability of smoothing depends on the parameter of SSD. It also shows that the color cycle is very important in the process of smoothing, although the smoothing by broaden of laser spectral width for PM is poor.
Shenlei Zhou, Jian Zhu, Xuechun Li, Zunqi Lin, Yaping Dai. Experimental Study of Smoothing by Spectral Dispersion[J]. Collection Of theses on high power laser and plasma physics, 2006, 4(1): 34.
PDF全文
