中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2025-2029.doi: 10.1088/1009-1963/15/9/022

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Generation of third harmonic emission in propagation of femtosecond laser pulses in air

奚婷婷, 张杰, 鲁欣, 郝作强, 杨辉, 董全力, 武慧春   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2005-11-02 修回日期:2006-05-09 出版日期:2006-09-20 发布日期:2006-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374116, 10390160 and 60478047) and the National Hi-tech ICF Programme.

Generation of third harmonic emission in propagation of femtosecond laser pulses in air

Xi Ting-Ting(奚婷婷), Zhang Jie(张杰)†, Lu Xin(鲁欣), Hao Zuo-Qiang(郝作强), Yang Hui(杨辉)，Dong Quan-Li(董全力), and Wu Hui-Chun(武慧春)   

  1. Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2005-11-02 Revised:2006-05-09 Online:2006-09-20 Published:2006-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374116, 10390160 and 60478047) and the National Hi-tech ICF Programme.

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摘要： The main characteristics of the third harmonic emission generated by femtosecond laser pulses propagating in air are investigated by numerically solving the coupled nonlinear Schr?dinger equations. Strong third harmonic emission is observed with a maximum conversion efficiency as high as 0.43%. The on-axis phase difference between fundamental beam and third harmonic is investigated. The result is in good agreement with the phase-locking mechanism. Dependence of the conversion of third harmonic emission on focusing conditions is also studied. The results are also compared with those of experiments.

关键词: third harmonic emission, plasma channel

Abstract: The main characteristics of the third harmonic emission generated by femtosecond laser pulses propagating in air are investigated by numerically solving the coupled nonlinear Schr?dinger equations. Strong third harmonic emission is observed with a maximum conversion efficiency as high as 0.43%. The on-axis phase difference between fundamental beam and third harmonic is investigated. The result is in good agreement with the phase-locking mechanism. Dependence of the conversion of third harmonic emission on focusing conditions is also studied. The results are also compared with those of experiments.

Key words: third harmonic emission, plasma channel

中图分类号:  (Doped-insulator lasers and other solid state lasers)

  • 42.55.Rz
42.60.By (Design of specific laser systems) 42.55.Xi (Diode-pumped lasers) 42.60.Pk (Continuous operation) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.60.Lh (Efficiency, stability, gain, and other operational parameters)