Observation of laser-induced air plasma by pulsed CO2 laser with an ICCD camera

Jian Tang; Zhixian Jiu; Chenguang Yang; Duluo Zuo; Zuhai Cheng

doi:10.1117/12.821602

18 February 2009 Observation of laser-induced air plasma by pulsed CO₂ laser with an ICCD camera

Jian Tang, Zhixian Jiu, Chenguang Yang, Duluo Zuo, Zuhai Cheng

Proceedings Volume 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications; 72760F (2009) https://doi.org/10.1117/12.821602
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

In order to know more about the mechanism of laser propulsion, the temporal evolvement and spatial distribution of the air plasma produced by a Transversely Excited Atmospheric (TEA) pressure CO₂ laser were investigated with a image intensified charged coupled device (ICCD) camera. The energy of the TEA CO₂ laser was 5 ~ 6 J, with pulse FWHM of 100 ns at 10.6 μm, trailing approximately 2 μs. The experimental results indicated that the radial evolution was almost symmetrical but the axial evolution was not. During the development stage of the breakdown, the laser-absorption region was propagated along the beam axis in the direction opposite beam incidence. The axial length of plasma and the maximal intensity of the laser-induced plasma were investigated, which could vary with the laser power. The propagation speed of the laser-induced plasma was about 10⁴ m/s at the initial stage of breakdown, and then the propagation speed of the laser-induced plasma decreased gradually.

Citation Download Citation

Jian Tang, Zhixian Jiu, Chenguang Yang, Duluo Zuo, and Zuhai Cheng "Observation of laser-induced air plasma by pulsed CO₂ laser with an ICCD camera", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 72760F (18 February 2009); https://doi.org/10.1117/12.821602

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