Measurement of tilt using light distribution at the critical angle

Abstract

There is a method using changes of the optical power of transmission and the reflection in the critical angle of a prism, to measure the tilt of the mirror. This method was able to measure the angle for sensitivity of the sub-micro radian. When the distribution of light is considered in this study, improvement of the precision is expected. But, the transmitted light changes the form, therefore the analysis of the transmitted light is unsuitable. Distributions of light before being incident on a prism and reflected light are analyzed. Those results are reported.