利用OMA谱仪测量飞秒激光的谐波光谱  

A measurement of the femtosecond laser harmonic spectrum by OMA spectrometer

作　　者：王光昶[1] 陈旭[1] 梁栋[1] 张建炜[1] 郑志坚[2] 

机构地区：[1]成都医学院物理教研室,成都610500 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《原子与分子物理学报》2017年第6期1088-1092,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10535030);发育与再生四川省重点实验室基金(SYS12-003)

摘　　要：本文给出了利用光学多道分析(OMA)谱仪测量飞秒激光谐波光谱的一种方法 .该方法是利用OMA谱仪(谱分辨0.1nm)加CCD(1152×1242)相机探测设备,用消色差的相机镜头作为空间分辨,在固体靶前表面测量了激光的二次谐波(2ω_0)光谱.结果显示:在平行于靶面的方向和接近于法线方向分别观测到了2ω_0光谱,但在接近于法线方向的谐波光谱出现了精细结构,并得到2ω_0谐波谱的分裂间隔约为3.183 nm.分析认为,自生磁场的产生和作用是导致二次谐波光谱精细结构及谐波谱分裂的主要原因.This paper presents a method of using optical multi - channel spectrometer analysis （OMA） to measure femtoseeond laser harmonic spectrum. The OMA spectrometer （with 0. 1 nm spectral resolution） with CCD camera （1152 × 1242 resolutions） is used in this method, and the achromatic camera lens is as spatial resolution, the laser second harmonic （200o） spectrum is measured in front of the solid target surface. Results shown that 2 ωo spectrum were observed in the direction paralleled to the target surface and in close to the normal direction respectively, but fine structure also appeared in close to the normal direction of the harmonic spectrum, and the splitting interval to get 2 0% harmonic spectrum is about 3. 183 nm. Analysis thinks the emergence and roles of spontaneous magnetic field are the main reasons lead to the second harmonic spectral fine structure and the harmonic spectrum division.

关 键 词：飞秒激光 OMA谱仪 谐波光谱 精细结构 自生磁场 

分 类 号：O434.12[机械工程—光学工程]