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针对常温工作条件下利用磷酸氧钛钾(KTP)晶体对钇铝石榴石(Nd…YAG)晶体1319nm激光三倍频产生440nm蓝色激光的实验,对三倍频KTP晶体的相位匹配角进行了理论计算和实验研究。通过多组色散方程得到KTP晶体的相位匹配角,并计算出相应的有效非线性系数。选取一组结果(θ=84.6°,φ=0°)对KTP晶体切割,利用一台1319nm激光器,将晶体放入腔中,采用旋转晶体偏角和调节温度的方法寻找出三倍频KTP晶体最佳匹配角度(θ=85.04°,φ=0°)。该晶体经过重新切割,440nm蓝色激光输出的光束强度有了明显的提高,最佳工作温度为18℃。
In this paper, the phase matching angle of triplet KTP crystal was investigated by using the KTP crystal at room temperature to produce a blue laser at 440 nm for 1319 nm Nd: YAG crystal. Theoretical calculation and experimental research. The phase matching angle of KTP crystal was obtained by multiple sets of dispersion equations and the corresponding effective nonlinear coefficients were calculated. Select a set of results (θ = 84.6 °, φ = 0 °) of KTP crystal cutting, the use of a 1319nm laser, the crystal into the cavity, the use of rotating crystal declination and adjust the temperature to find out the third harmonic KTP crystal Best matching angle (θ = 85.04 °, φ = 0 °). The crystal after re-cut, 440nm blue laser output beam intensity has been significantly improved, the best working temperature is 18 ℃.