Chinese Optics Letters, 2009, 7 (9): 865, Published Online: Sep. 22, 2009   

Plasma channel formed by ultraviolet laser pulses at 193 nm in air Download: 668次

Author Affiliations
1 State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
2 Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3 Department of Physics, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
4 Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract
The propagation of picosecond deep ultraviolet laser pulse at wavelength of 193 nm in air is numerically investigated. Long plasma channel can be formed due to the competition between Kerr self-focusing and ionization induced defocusing. The plasma channel with electron density of above 10<sup>13</sup>/cm<sup>3</sup> can be formed over 70 m by 50-ps, 20-mJ laser pulses. The fluctuation of laser intensity and electron density inside ultraviolet (UV) plasma channel is significantly lower than that of infrared pulse. The linear absorption of UV laser by air is considered in the simulation and it is shown that the linear absorption is important for the limit of the length of plasma channel.

Yuanyuan Ma, Xin Lu, Tingting Xi, Qihuang Gong, Jie Zhang. Plasma channel formed by ultraviolet laser pulses at 193 nm in air[J]. Chinese Optics Letters, 2009, 7(9): 865.

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