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本文报道了利用晶体通光方向上光束相差测量弹光系数的方法，并采用相对法和绝对法测量了Ｒｂ＿０．３Ｋ＿０．７ＴｉＯＰＯ＿４晶体的弹光系数。
In this paper, the method of measuring the phase difference of light in the light passing through the crystal is reported. The relative luminosity and the absolute method are used to measure the luminosity coefficient of Rb_0.3K_0.7TiOPO_4 crystal.