Broadband second harmonic generation of femtosecond pulses at magnitude of GW/cm2

Zhangchao Huang, Wending Zhang, Hongyi Lin, Yingchao Xu, Hanxin Shen, Jianjian Ruan, Dong Sun, Heng Wang, Wenzhang Zhu

科研成果: 期刊稿件文章同行评审

摘要

The experiments of second harmonic generation (SHG) of 57.4 fs pulses at 1550 nm wavelength for type I(o+o-e) and type 0 (e+e-e) are achieved using Mg-doped lithium niobate crystal with mole fraction of 5% of magnesium. For SHG of type I, the second harmonic pulse with spectrum width of 28 nm and pulse width of 79 fs is obtained at the peak density of 4.3 GW/cm2, and the conversion efficiency is up to 54%. For SHG of type 0, the second harmonic pulse with spectrum width of 2.1 nm is obtained at the peak density of 3.7 GW/cm2, and the conversion efficiency is up to 40%. The key points of the evolution for fundamental pulse and second harmonic pulse in SHG process are analyzed, which are the phase-match of femtosecond pulse multi-wavelength components of fundamental wave in frequency domain and the group-velocity-match of fundamental pulse and second harmonic pulse in time domain. It is found that the spectral width can keep constant in the propagation when the phase-match of multi-wavelength components is satisfied. However, the spectral width will gradually become narrower with the increase of the propagation distance when the phase-match of the center wavelength is satisfied only.

源语言英语
文章编号0332001
期刊Guangxue Xuebao/Acta Optica Sinica
37
3
DOI
出版状态已出版 - 10 3月 2017

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