提出了一种基于楔形平板等厚干涉原理测量光学玻璃非线性折射率变化的方法。在理论分析的基础上,建立了变形的等厚干涉条纹变化Δe/e与待测玻璃平片(K9玻璃)折射率变化量Δnb之间的数学模型;在选取一定的实验条件下,获得等厚干涉实验测量干涉图样,并利用MATLAB对实验所得的干涉图进行图像数据处理分析计算,恢复出非线性变化光学玻璃材料的折射率变化量Δnb,该方法的测量精度可达10-6。

A method to measure the change of optical glass nonlinear refractive index change is put forward, based on wedge flat equal thickness interference. Based on further interference theory analysis, a mathematical model is established between Δe/e0 (variation of distorted equal thick interference fringes) and Δnb (refractive index variation). In selecting certain experimental conditions, the thick interference experiment measuring interference pattern is given. MATLAB is used in image data processing analysis. Through the calculation, non-linear optical glass material refractive index variation is obtained. The precision of this method can reach 10-6.