【摘要】 报导了掺Ｎｂ改性ＫＴｉＯＰＯ４（ＫＴＰ）晶体二谐相位匹配条件的研究结果，用倍频实验和通过测量主折射率计算最佳相位匹配角两种方法来核实掺铌ＫＴＰ晶体的最佳相位匹配角．实验结果表明，两种方法所得的最佳相位匹配角差异不到０１°．与纯的ＫＴＰ晶体比较，对１０６４ｎｍＮｄ∶ＹＡＧ激光，掺Ｎｂ后，ＫＴＰ晶体的最佳相位匹配角变化较大．随着Ｎｂ浓度的提高，最佳相位匹配角从纯ＫＴＰ的θｍ＝９０°，φｍ＝２３１°（在ｘｙ平面内）通过非临界相位匹配条件θｍ＝９０°，φｍ＝０°变化到ｘｚ平面内的θｍ＜９０°，φｍ＝０°．测量表明，在掺Ｎｂ２Ｏ５３％（ｍｏｌ）熔体中生长出的ＫＴＰ晶体最佳相位匹配条件为θｍ＝８８３６°，φｍ＝０°更多还原

【Abstract】 Study results of phase matched condition for second harmonic generation in modified KTiOPO 4 (KTP) crystal are reported in this paper. Optimum phase matched angle in modified Nb doped KTP crystal is checked by two kinds of methods such as frequency doubling experiment and calculating through principle refractive index of crystal. It is shown that the difference of optimum phase matched angle is less than 0.1 degree for the two kinds of methods. Compared with pure KTP crystal, the phase matched angle of Nb doped KTP for 1 064 nmNd∶YAG laser changes remarkably. Along with Nb increasing, the optimum phase matched angle form θ m =90°,φ m =23 1° for pure KTP crystal passes through non-critical phase matched condition θ m =90°,φ m =0° to θ m <90°,φ m =0°. The phase matched angle is θ m =88 36°,φ m =0° has approached non-critical phase matched condition for KTP crystal grown from melt contained 3%(mol) Nb 2 O 5 .更多还原