【摘要】 为了提高双轴晶体中二次谐波的效率,需要计算相位匹配曲线及有效二阶非线性系数d_eff^Ⅰ和,d_eff^Ⅱ从而求得最佳相位匹配角。本文给出了双轴晶体五种点群包括单斜m点群和三斜1点群的d_eff^Ⅰ和,d_eff^Ⅱ计算公式;给出了一水甲酸锂、铌酸钡钠、α—碘酸等八种双轴晶体的计算结果;并给出了一水甲酸锂、铌酸钡钠的二次谐波相位匹配试验结果。实验结果同计算结果非常一致。更多还原

【Abstract】 In order to raise the efficiency of second harmonic generation, it is necessary to calculate the PM loci and the effective second-order nonlinear coefficients d_eff^I and d_eff^II in biaxial crystals, and to find the optimum PM angleθandф. This paper gives all the formulas of d_eff^I and d₍eff^II for 5 biaxial crystals classes including monoclinic and 1-triclinic, and gives the computed results for 8 biaxial crystals, such as HCOOLi·H₂O, Ba₂NaNb₅O₁₅, α-HIO3 etc. The experimental results of PM SHG process using HCOOLi·H₂O and Ba₂NaNb₅O₁₅ are also reported, The computed results agree quite favorably with the experimental results,更多还原