中国物理B ›› 2005, Vol. 14 ›› Issue (4): 714-719.doi: 10.1088/1009-1963/14/4/013

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Brewster-oriented passive Q-switch intracavity optical parametric oscillator

朱大勇1, 张志勇1, 张靖1, 万勇2, 曾钦勇2, 韩凯3   

  1. (1)School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China; (2)School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China;Southwest Institute of Technical Physics, Chengdu, 610041, China; (3)Southwest Institute of Technical Physics, Chengdu, 610041, China
  • 收稿日期:2004-07-09 修回日期:2004-12-09 出版日期:2005-04-20 发布日期:2005-03-28

Brewster-oriented passive Q-switch intracavity optical parametric oscillator

Wan Yong (万勇)ab, Zhu Da-Yong (朱大勇)a, Zeng Qin-Yong (曾钦勇)ab, Zhang Zhi-Yong (张志勇)a, Zhang Jing (张靖)a, Han Kai (韩凯)b   

  1. a School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China; b Southwest Institute of Technical Physics, Chengdu, 610041, China
  • Received:2004-07-09 Revised:2004-12-09 Online:2005-04-20 Published:2005-03-28

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摘要： The behaviour of passively Q-switched solid-state lasers containing intracavity optical parametric oscillators (OPOs) is described, and a model to optimize this system's performance is developed. Meanwhile, an Nd:YAG laser-pumped KTiOPO4 (KTP) intracavity OPO for eye safe laser output is studied experimentally. A Brewster-oriented bis-(4-dimethylaminodithiobenzil)-nickel (BDN) dye film is employed in laser cavity, which plays the double role of a passive Q-switch and a Brewster plate, to Q-switch the light to increase its intensity and polarize the light so that the polarization plane of fundamental irradiation is perpendicular to the $Z$-axis of KTP serving as the OPO nonlinear crystal, thereby providing type II phase matching conditions to generate 1.572$\mu$m eye-safe signal laser. Eye-safe signal radiations of 6.6mJ per pulse at 1.572$\mu$m wavelength and pulse width as narrow as 6.0ns (FWHM) were obtained. Peak power was up to 1.1MW.

Abstract: The behaviour of passively Q-switched solid-state lasers containing intracavity optical parametric oscillators (OPOs) is described, and a model to optimize this system's performance is developed. Meanwhile, an Nd:YAG laser-pumped KTiOPO4 (KTP) intracavity OPO for eye safe laser output is studied experimentally. A Brewster-oriented bis-(4-dimethylaminodithiobenzil)-nickel (BDN) dye film is employed in laser cavity, which plays the double role of a passive Q-switch and a Brewster plate, to Q-switch the light to increase its intensity and polarize the light so that the polarization plane of fundamental irradiation is perpendicular to the $Z$-axis of KTP serving as the OPO nonlinear crystal, thereby providing type II phase matching conditions to generate 1.572$\mu$m eye-safe signal laser. Eye-safe signal radiations of 6.6mJ per pulse at 1.572$\mu$m wavelength and pulse width as narrow as 6.0ns (FWHM) were obtained. Peak power was up to 1.1MW.

Key words: optical parametric oscillator, KTiOPO4 crystal, passive Q-switch, eye-safe

中图分类号:  (Q-switching)

  • 42.60.Gd
42.55.Rz (Doped-insulator lasers and other solid state lasers) 42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.60.By (Design of specific laser systems) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)