Efficient, low-threshold collinear and noncollinear beta-barium borate optical parametric oscillators

被引:20
作者
Oien, AL [1 ]
McKinnie, IT [1 ]
Jain, P [1 ]
Russell, NA [1 ]
Warrington, DM [1 ]
Gloster, LAW [1 ]
机构
[1] UNIV MANCHESTER, DEPT PHYS & ASTRON, MANCHESTER M13 9PL, LANCS, ENGLAND
关键词
D O I
10.1364/OL.22.000859
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The performance of collinear and noncollinear pulsed barium borate optical parametric oscillators with third-harmonic Nd:YAG pumping is analyzed. The effects of tangential phase matching and pump Poynting vector walk-off compensation are shown to enhance noncollinear operation. However, we show that these effects are mutually exclusive for a type I beta-barium borate optical parametric oscillator and furthermore that tangential phase matching is dominant. The selection of a collinear or a noncollinear configuration is determined by pump divergence and spot size as well as by crystal aperture. With a pump divergence of 4 mrad, noncollinear operation is optimal. The highest slope efficiency, 37%, and the lowest threshold, 5 mJ, are obtained with nearly perfect tangential phase matching. For a pump divergence of less than 2 mrad and a similar spot size, collinear operation gives the lowest threshold, 3.2 mJ, and the highest slope efficiency, 33%. (C) 1997 Optical Society of America.
引用
收藏
页码:859 / 861
页数:3
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