【摘要】 当光源为高斯型光谱,非平衡光路中考虑介质色散时求出双光束干涉的光强度解析解。分析了干涉条纹可见度和可见范围与介质的厚度、色散及光谱线宽度的关系;干涉光强度变化的相位关系。据此得出:白光干涉法除用来测量群折射率外还可用作介质色散的测量;高测量精度下谱线宽度应满足的关系式;干涉条纹可见度最大的位置与光强度最大的位置并不重合;若以最大光强度位置作为零光程差,会出现四分之一中心波长的系统误差。并用不同谱线宽度的光源对部分结论进行了实验验证。更多还原

【Abstract】 When the light source is with Gaussian shape spectrum,a dispersion media is inserted in the optical path to deduce the light intensity of double-beam interferences,and the analytic expression of the light intensity is obtained.The dependence of interference fringe visibility and visible range on media thickness,media dispersion and spectral line width are analysed.Meanwhile,the relations between phase and light intensity are also investigated.It′s concluded that the white light interference can also be used to measure both the media dispersion and the group refraction index;the formulation of spectral line width with high measurement accuracy can be deduced;the maximal interference fringe visibility does not appear exactly at the maximal light intensity point;an error of a quater of center wavelength is introduced when one objects the 3rd conclusion above.Some of this conclusions are certified with light sources of different spectral line widths experimentally.更多还原