Third-order harmonic generation by self-guided femtosecond pulses in air
Hui YangLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaJie ZhangLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaL.Z. ZhaoLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaYingjun LiDepartment of Physics, University of Mining and Technology of China, Beijing 100083, ChinaH. TengLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaY. T. LiDepartment of Physics, University of Mining and Technology of China, Beijing 100083, ChinaZihao WangLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaZ. L. ChenLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaZhiyi WeiLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, ChinaJ. X.Department of Modern Physics, University of Science and Technology of China, Hefei 230026, ChinaWeixing YuShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaZ. M. ShengLaboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
2003en
ABI
Abstract
Strong third-order harmonic (TH) emission is observed with a conversion efficiency higher than 10(-3) from a plasma channel formed by self-guided femtosecond laser pulses propagating in air. The main characteristics of TH emission in various conditions and the phase-matching condition between the fundamental and the TH wave are investigated. An optimized condition is found, under which the TH conversion efficiency is maximized. Our experimental results show that radiation of the emission in ultraviolet wavelength range makes a major attribution to TH emission, whereas the effects of self-phase modulation are not important when intense laser pulses interact with gaseous media.
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