Spectroscopic diagnosis of air plasma induced by pulsed CO2 laser

TANG Jian; ZUO Du-luo; YANG Chen-guang; CHENG Zu-hai

doi:10.7510/jgjs.issn.1001-3806.2013.05.016

In order to study the evolution of laser-induced plasma and obtain the properties of plasma, transversely excited atmospheric CO2 laser was focused by a parabolic reflector to generate air breakdown plasma. Based on the imaging spectrometer system and intensified CCD detector, time-space resolution of laser-induced air plasma were investigated and the time evolution spectra and the space resolution spectra of plasma were obtained. Electron temperature of about 4104K and electron density of 1018cm-3 were calculated respectively by using the ratio of oxygen line spectrum and continuous spectrum and full width at half maximum of spectral line. The results show high-energy laser-induced plasma spectra radiate the intense continuous spectra outward, comparing with low-energy laser-induced plasma spectra. At the same time, laser-induced air plasma expands outward rapidly with the way of the laser-supported detonation wave. Due to the shielding effect of laser power, laser-induced air plasma shows the behavior of spatial separation. The results are useful for understanding the interaction between plasma and high-energy laser.

Spectroscopic diagnosis of air plasma induced by pulsed CO2 laser

Corresponding author: ZUO Du-luo, zuoduluo@mail.hust.edu.cn;

1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China

Received Date: 2012-11-19

Accepted Date: 2012-12-27

Available Online: 2013-09-25

Abstract: In order to study the evolution of laser-induced plasma and obtain the properties of plasma, transversely excited atmospheric CO2 laser was focused by a parabolic reflector to generate air breakdown plasma. Based on the imaging spectrometer system and intensified CCD detector, time-space resolution of laser-induced air plasma were investigated and the time evolution spectra and the space resolution spectra of plasma were obtained. Electron temperature of about 4104K and electron density of 1018cm-3 were calculated respectively by using the ratio of oxygen line spectrum and continuous spectrum and full width at half maximum of spectral line. The results show high-energy laser-induced plasma spectra radiate the intense continuous spectra outward, comparing with low-energy laser-induced plasma spectra. At the same time, laser-induced air plasma expands outward rapidly with the way of the laser-supported detonation wave. Due to the shielding effect of laser power, laser-induced air plasma shows the behavior of spatial separation. The results are useful for understanding the interaction between plasma and high-energy laser.

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Reference (18)

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Spectroscopic diagnosis of air plasma induced by pulsed CO2 laser

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