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给出了不同基频光和倍频光偏振态组合情况下，淀积在固体基板上的Ｌａｎｇｍｕｉｒ－Ｂｌｏｄｇｅｔｔ（ＬＢ）单分子层膜在面对入射光方向和背对入射光方向时，反射及透射光学二次谐波产生随入射角变化关系的理论公式。在此基础上，对一种芪盐ＬＢ膜样品进行了变入射角的透射二次谐波产生研究。研究结果表明，只要在整个３６０°范围内旋转样品以改变入射角，那么只要在一组基频光和倍频光偏振态组合（ｐ→ｐ）情况下，就可以方便而又准确地得到芪盐分子的二阶非线性极化率β和分子倾斜角〈ψ〉。这是一种由二次谐波产生研究得到ＬＢ膜中分子β和〈ψ〉的新方法
The results show that the Langmuir-Blodgett (LB) monolayer film deposited on a solid substrate in the case of combination of polarization states of different fundamental frequency and frequency doubling light, in the direction of incident light and the direction of back-facing incident light, Transmitted optical second harmonic generation with the incident angle changes in the relationship between the theoretical formula. On the basis of this, we study the second harmonic generation of a Q-salt LB film with varying incident angle. The results show that as long as the sample is rotated 360 ° to change the angle of incidence, it is convenient and accurate to obtain the stilbene at a set of combinations of fundamental polarization and frequency doubling (p → p) Second - order nonlinear polarizability β of salt molecules and molecular tilt angle. This is a new method for obtaining beta and <ψ> molecules in LB films from studies of second harmonic generation