Reflection coefficients and optical admittances loci monitoring for thin film coatings and its applications to optical systems

point. This monitoring method is derived from a traditional optical monitor structure. The corresponding error compensations were applied to get good output. Another optical monitoring system is also demonstrated to extract the temporal phase change of the reflection coefficient of the growing film stack. A vibration and air turbulence insensitive polarization interferometers was used in this system to directly detect fluctuating phase and magnitude of the reflection coefficient of a growing film stack as well as the real time optical admittance at normal incidence.