GdCOB晶体非线性光学系数的完全标定及空间分布

Absolute Scale and Spatial Distribution of Nonlinear-Optical Coefficients of GdCOB Crystal

实验确定了GdCOB晶体的全部非线性系数 ,并用不同切向的GdCOB晶体验证了由此决定的有效非线性系数的空间分布。实验表明 ,GdCOB晶体的有效非线性系数在θ=66 .8°,φ =132 .6°处具有最大值 ,为 1 68pm V。当长度为 6mm时 ,该切向晶体的倍频转换效率达到 48%。

The whole nonlinear optical coefficients of GdCOB crystal are evaluated by phase matching SHG method and Maker fringe method. The spatial distribution of effective nonlinear coefficient d eff are proved with the crystals cut in different directions in the experiments. The results show that d eff reaches the maximum of 1.68 pm/V at the direction of θ=66.8°,φ=132.6°. The SHG conversion efficiency reaches 48% with a 6 mm long GdCOB crystal cut along this direction.