Simultaneous Measurement of Surface Shape and Optical Homogeneity with Dual-Wavelength Phase-Shifting Digital Holography

Based on the difference of refractive index by different wavelengths in optical components, a novel method for measuring the optical homogeneity of optical components by using dual-wavelength phase-shifting digital holography has been proposed and verified by computer simulation. Meanwhile, this method could measure the surface shape of optical components accurately while we do not need to measure the front surface and rear surface of sample separately. Furthermore, the phase of reference wave and phase distortion caused by the object wave could be eliminated automatically, so the method has a function of automated optical wavefront distortion compensation, which can improve the measurement accuracy.