摘要
The influence of the target temperature on the molecular emission of femtosecond laser-induced breakdown spectroscopy(LIBS) was investigated experimentally. An Al target was ablated to produce laser-induced plasma. The Al target was uniformly heated to a maximum of 250℃. The measured molecular emission was AlO(△ν=0) from the femtosecond LIBS of the Al target.The measurements indicated that the molecular emission of AlO increased as the temperature of the Al target increased. In addition, a two-temperature model was used to simulate the evolution of the electron and lattice temperature of the Al target with different initial temperatures. The simulated results showed that the electron and lattice temperatures of Al irradiated by the femtosecond laser increased as the initial temperature of the Al target increased;also, the simulated ablated depth increased. Therefore, an increase in the initial Al target temperature resulted in an enhancement in the spectral signal of AlO from the femtosecond LIBS of Al,which was directly related to the increase in the size of the ablated crater. The study suggested that increasing the temperature of the target improves the intensity of molecular emission in femtosecond LIBS.
作者
Wei QI
Qiuyun WANG
Junfeng SHAO
Anmin CHEN
Mingxing JIN
齐巍;王秋云;邵俊峰;陈安民;金明星(Beijing Institute of Tracking and Telecommunications Technology,Beijing 100094,People’s Republic of China;Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,People’s Republic of China;State Key Laboratory of Laser Interaction With Matter&Innovation Laboratory of Electro-Optical Countermeasures Technology,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,People’s Republic of China)
基金
support by Scientific and Technological Research Project of the Education Department of Jilin Province,China(No.JJKH20200937KJ)
National Natural Science Foundation of China(Nos.11674128,11674124,and 11974138).
