18 February 2009 Observation of laser-induced air plasma by pulsed CO2 laser with an ICCD camera
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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.
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Jian Tang, Jian Tang, Zhixian Jiu, Zhixian Jiu, Chenguang Yang, Chenguang Yang, Duluo Zuo, Duluo Zuo, Zuhai Cheng, 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); doi: 10.1117/12.821602; https://doi.org/10.1117/12.821602

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