摘要
采用光学多道谱仪和光学条纹相机耦合,组成时间分辨的Raman散射光谱测量系统,可实现0.5nm的光谱分辨和好于10ps的时间分辨。采用该测量系统,在神光Ⅱ装置上开展了脉宽1ns、波长351nm的激光与两种不同尺寸柱腔靶相互作用的物理实验,获得了时间分辨的SRS光谱实验结果。研究表明,SRS光谱在时间上相对于入射激光有一定的延迟,腔靶尺寸减小时,延迟时间随之减小。通过长、短波截止波长分析电子密度方法,计算得出了Ⅰ型和Ⅱ型腔靶SRS散射光最短波长光谱发生的密度区分别为0.069nc和0.027nc。
A diagnostic of time-resolved spectra of scattered light has been developed using optical multichannel analyzer coupled with optical scanning camera. The time-resolved spectra could achieve a goal of SRS temporal response with 10 ps resolution and dimensional response with 0.5 nm resolution. An experiment of laser-plasma interaction in hohlraum plasmas produced by laser beams with 351 nm wavelength,1 ns pulse duration at SGⅡ laser facility is reported. The time-resolved spectra of scattered light by stimulated Raman scattering（SRS） were measured. There existed a delay-time for the Raman scattering corresponding to the entering laser. When laser entered into a smaller hohlraum,the delay-time was minished. Electron density was obtained by cut-off wavelength analysis.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第9期2051-2054,共4页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目
