Measurement of the Elasto-optical Coefficient of Crystal Using Optical Fiber Michelson Interferometer

Starting from the index ellipsoid,the elasto-optical coefficient of crystal is analyzed. An improved method using white-light interferometry and optical fiber Michelson interferometer to measure group refractive index is introduced, using grating displacement sensor to increase the displacement precision of scanning mirrow. The change of quartz crystal refractive index is measured under the different outside force,and the elasto-optical coefficient is determined.