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.
Received: 02 November 2005
Revised: 09 May 2006
Accepted manuscript online:
PACS:
42.55.Rz
(Doped-insulator lasers and other solid state lasers)
(Efficiency, stability, gain, and other operational parameters)
Fund: Project supported by the National Natural Science
Foundation of China (Grant Nos 10374116, 10390160 and 60478047) and the
National Hi-tech ICF Programme.
Cite this article:
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) Generation of third harmonic emission in propagation of femtosecond laser pulses in air 2006 Chinese Physics 15 2025
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