Experimental measurement of absorptivity of sapphire at 532nm laser radiation
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摘要: 为了分析激光偏振化方向和激光入射角对激光吸收率、反射率和透过率的影响,采用量热法测量了蓝宝石对532nm线偏振光辐照下的反射率和透过率,并获得了相应的吸收率。比较实验中测得的反射率和理论计算值,发现两者变化趋势一致,证实了该试验方法的可行性。结果表明,垂直于入射面的反射率随入射角的增大而增大,平行于入射面的反射率则随入射角的增大逐渐减小,在入射角接近60时达到最小,然后急剧增大;在垂直和平行偏振光下,透过率均随着入射角增大而减小,吸收率则逐渐增大。该结果为激光加工蓝宝石时工艺参量的选择和优化提供了参考。Abstract: In order to study the effects of the laser polarized direction and the incident angle on the laser reflectivity, transmissivity and absorptivity, the sapphire reflectivity, transmissivity and absorptivity at linearly-polarized 532nm laser beam were obtained by means of calorimetry. The obtained absorptivity was in good agreement with the one calculated with Fresnel formula. Experiment also examined the law of the sapphire reflectivity, transmissivity and absorptivity at different incident angle and polarization state. The experimental results have indicated that the reflectivity of linearly-polarized laser beam perpendicular to the incident plane increases with the incident angle. On the other hand the one parallel to the incident plane decreases gradually to the minimum till the incident angle close to 60, and then sharply increases. Under the radiation of parallel and perpendicular linearly-polarized laser beam the transmissivity decreases with the incident angle, while the absorptivity increases. It provides some references for the selection and optimization of technological parameters during the laser material processing.
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Keywords:
- laser technique /
- laser absorptivity /
- calorimetry /
- sapphire /
- linearly polarized light
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