飞秒激光低压镍等离子体光谱的实验研究  

Experimental study on spectra of femtosecond-laser-induced low-pressure Ni plasma

作　　者：孙少华[1] 刘小亮[1] 孙铭泽[1] 曹瑜[1] 史彦超[1] 赵培茜[1] 胡碧涛[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《强激光与粒子束》2014年第5期145-149,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11075068)

摘　　要：分别对低于0.1 MPa的空气和氩气环境气体条件下的飞秒激光镍等离子体光谱进行了实验研究。结果表明,在两种环境气体中,激光镍等离子体光谱均表现为连续谱和原子线状谱的叠加。随着环境气压的降低,由于电子密度的下降,从而使得低压条件下的谱线比高压条件下的谱线具有更好的分辨特性。同时,谱线强度经历了由缓慢增强发展到迅速降低的演化过程。另外,还讨论了环境气体成分对谱线强度的影响。The spectra of Ni plasma induced by femtosecond laser pulses at sub-atmospheric pressure environment have been studied experimentally in air and argon gas, respectively. The results show that the spectra of laser-induced plasmas are composed of continuous spectra and atomic line spectra in these two surrounding gases. The spectra at lower surrounding pressure show higher resolution due to the decrease of electron density, compared to that at higher pressure. Besides, the intensity of line spectra undergoes the transition from slow increase to rapid decrease. Additionally, the effect of the composition of the surrounding gas on the intensity is also briefly discussed.

关 键 词：飞秒激光 环境气压 等离子体 谱线强度 

分 类 号：O433.1[机械工程—光学工程] O536[理学—光学]