粉末SHG法的光强角分布研究

Study of Angle Distribution of Light Intensity in Powder SHG Method

有机非线性光学材料多年来一直受到关注,粉末二次谐波(SHG)法是研究这类新型材料的一个主要手段,它可以迅速、简洁地对某一种合成路线是否值得继续进行作出初步判断。但是人们对于这种方法的实验细节却一直没有太多研究,这里对反射光强的角分布,及其与入射角、粉末颗粒大小的关系,进行较细致的研究,验证了多年来一直使用的以60°入射而在反射角上测量实验装置的正确性,但是当样品颗粒差异较大的时候,应该采用小角度探测方式,这样可减小颗粒效应。

Powder SHG method is one of the main methods to study new materials. This paper carries out more detailed research, concerning the angel distribution of reflected light and its relations with incidence angle and powder size. The study validates correctness of experimental setup by taking 60° as incidence angle, and detecting at reflection angle. When samples have different powder size, it is suggested to use small incidence angle and detect at normal to reduce granular effect.