摘要
提出了各向异性介质平行平板干涉中的相位差计算方法.证明了e光干涉产生的条纹为严格的椭圆曲线,椭圆长短轴的比值等于o光主折射率与e光主折射率之比,而与晶体厚度、干涉级等参数无关.拍摄了实验干涉图,并用最小二乘法对干涉条纹进行椭圆曲线拟合,结果与理论完全一致.本文提出的方法可用于晶体主折射率比值的精确简便测量.
A calculation method for phase difference in interference with an anisotropic medium parallel plate is proposed. It has been proved that fringes of extraordinary waves are ellipses. The ratio of two semi-axes of the ellipse is equal to the ratio of two principal refractive indices. The experiment with a lithium niobate crystal has been completed and which is in agreement with the theoretical result.
出处
《大学物理》
北大核心
2008年第8期6-8,共3页
College Physics
基金
国家质检总局科技计划资助项目(2007DK59)
关键词
平行平板干涉
各向异性介质
折射率测量
parallel plate interference
anisotropic medium
refractive index measurement
