YAl_3(BO_3)_4晶体折射率温度系数的测量  

Measurement of Thermal Refractive Index Coefficients of YAl_3(BO_3)_4 Crystal

作　　者：翟乃霞[1,2] 刘丽娟[1] 陈创天[1] 

机构地区：[1]中国科学院理化技术研究所北京人工晶体研究与发展中心,中国科学院功能晶体与激光技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《光学学报》2013年第9期205-209,共5页Acta Optica Sinica

基　　金：国家973计划(2010CB630701);国家自然科学基金重点项目(51132008)

摘　　要：采用最小偏向角法在40℃～160℃范围内分别测量了0.194、0.254、0.404、1.53、2.325μm等9个波长下非线性光学晶体YAl3(BO3)4(YAB)的折射率,通过最小二乘法拟合得到不同温度下折射率的Sellmeier方程及折射率温度系数随波长变化的函数表达式。在此基础上计算出YAB晶体I类相位匹配实现266nm紫外光输出时的温度带宽为6.9℃·cm。实验与计算结果表明,YAB晶体具有较好的热稳定性,有利于实现高功率、高稳定性的266nm激光输出。The refractive indices of nonlinear optical crystal YA13 （BO3）4 （YAB） for nine wavelengths of 0. 194, 0. 254, 0.404, 1.53, 2. 325 μm and so on under the temperature range from 40 ℃to 160 ℃ are measured by the prism minimum deviation method. The Sellmeier equations at different temperatures and the relationship between the thermal coefficients of refractive index and the wavelength have been obtained by the least square method. The calculated acceptance temperature for type I phase-matching of YAB crystal for 266 nm ultraviolet light generation is 6.9 ℃· cm based on the above equations. Both the experimental and theoretical values show that YAB crystal may be an ideal nonlinear optical crystal for 266 nm harmonic generation with high power and high stability because of its good thermal stability.

关 键 词：非线性光学 折射率温度系数 最小偏向角法 YAl3（BO3）4 晶体 

分 类 号：O437[机械工程—光学工程]