【摘要】 运用折射率椭球分析晶体的弹光效应,给出了三方晶系沿光轴方向的应力与折射率的变化关系.针对晶体的各向异性和折射率随应力变化很小的因素,利用白光干涉技术空间分辨率高的特点,将白光干涉技术拓展到研究各向异性材料的光学性质.并对测量群折射率的光纤迈克尔逊白光干涉技术进行了改进.采用光栅位移传感器和全保偏光纤提高反射扫描镜的位移准确度.通过测量石英晶体在不同外力下折射率的变化情况,确定了晶体的弹光系数.石英晶体的弹光系数P33和P13分别为0.110和0.279,其准确度达到0.001.更多还原

【Abstract】 Starting from the index ellipsoid,the elasticooptic effect of crystal is analyzed.The relation between the stress along the optical axis of trigonal crystallographic system and the refractive index is established.The optical property of crystal is anisotropic and the change of refractive index with the stress is little.The ability of the white-light interferometry is explored to measure the refractive index of anisotropic material using high spatial resolving power of the white-light interferometry.Moreover,an improved method using white-light interferometry and all polarization-maintaining fiber Michelson interferometer to measure group refractive index is introduced, using grating displacement sensor to increase the displacement precision of scanning mirror.The change of quartz crystal refractive index is measured under the different outside force,and the elasticooptic coefficient is determined.The elasticooptic coefficients of quartz crystal P33 and P13 are 0.110 and 0.279 respectively,the precision reaches 0.001.更多还原