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Investigation of ion characteristics in CO2 laser irradiating preformed tin-droplet plasma

Published online by Cambridge University Press:  12 August 2016

Z. Chen ,
X. Wang ,
D. Zuo  and
J. Wang
Z. Chen
Affiliation:
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, People's Republic of China
X. Wang*
Affiliation:
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, People's Republic of China
D. Zuo
Affiliation:
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, People's Republic of China
J. Wang
Affiliation:
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, People's Republic of China
*
Address correspondence and reprint requests to: X. Wang, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China. E-mail: xbwang@hust.edu.cn
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Abstract

Comparative study of CO2 laser-produced tin-droplet plasma with and without pre-pulse laser has been presented. A pre-pulse laser and the CO2 laser was combined and focused to tin-droplet with a diameter of 180 µm. The emitted Sn ions were detected by several Faraday cups to obtain angular distribution of ions in the laser-produced tin-droplet plasma. The influence of pre-pulse laser energy and delay time between pumping laser and pre-pulse laser on the ion characteristics was investigated. It is illustrated that ion average kinetic energy from CO2 laser-produced plasma (LPP) can be reduced when the tin-droplet target has been replaced by the preformed Sn plasma. The obtained optimal delay time with the lowest ion average kinetic energy is about hundreds of nanoseconds. The ion time-of-flight spectra show a twin peak structure in laser-irradiating preformed Sn plasma. And a superimposed Maxwell–Boltzmann (MB) distribution is proposed to describe this twin peak ion time-of-flight spectra. The fitting results quite agree with the raw ion time-of-flight spectra in current experiment. Then, the fitted plasma temperatures and mass-center velocities with various delay times in laser-irradiating preformed plasma are obtained, and the fitted plasma temperatures can be comparable with ion average kinetic energy in double-pulse LPP, which justified the rationality using this superimposed MB distribution.

Keywords

Ion kinetic energyPlasma debrisTin dropletPreformed plasmaLaser-produced plasma
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 3 , September 2016 , pp. 552 - 561
Copyright
Copyright © Cambridge University Press 2016 

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