Comparison of emission signals for different polarizations in femtosecond laser-induced breakdown spectroscopy  

作　　者：Qiuyun WANG Anmin CHEN Miao LIU Yitong LIU Qingxue LI Suyu LI Yuanfei JIANG Xun GAO Mingxing JIN 王秋云;陈安民;刘淼;刘奕彤;李庆雪;李苏宇;姜远飞;高勋;金明星(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,People’s Republic of China;School of Science,Changchun University of Science and Technology,Changchun 130022,People’s Republic of China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,People’s Republic of China [2]School of Science,Changchun University of Science and Technology,Changchun 130022,People’s Republic of China

出　　处：《Plasma Science and Technology》2021年第4期76-82,共7页等离子体科学和技术（英文版）

基　　金：support by National Natural Science Foundation of China(Nos.11674128,11674124 and 11974138);Scientific and Technological Research Project of the Education Department of Jilin Province in China(No.JJKH20200937KJ).

摘　　要：In this study, a femtosecond laser was focused to ablate brass target and generate plasma emission in air. The influence of lens to sample distance(LTSD) on spectral emission of brass plasma under linearly and circularly polarized pulses with different pulse energies was investigated. The results indicated that the position with the strongest spectral emission moved toward focusing lens with increasing the energy. At the same laser energy, the line emission under circularly polarized pulse was stronger compared with linearly polarized pulse for different LTSDs. Next, electron temperature and density of the plasma were obtained with Cu(Ⅰ) lines,indicating that the electron temperature and density under circularly polarized pulse were higher compared to that under linearly polarized pulse. Therefore, changing the laser polarization is a simple and effective way to improve the spectral emission intensity of femtosecond laserinduced plasma.

关 键 词：laser-induced breakdown spectroscopy femtosecond pulse polarization lens to sample distance emission enhancement 

分 类 号：O53[理学—等离子体物理] TN249[理学—物理]