Asfaw Araya (PhD)Kassa Joseph2018-06-272023-11-092018-06-272023-11-092007-04http://10.90.10.223:4000/handle/123456789/3936Reflectance Anisotropy spectroscopy (RAS) is a non-destructive optical probe of surfaces that is capable of operating with in a wide range of environment. In this thesis, by applying this optical technique attempt was made to determine the degree of anisotropy of a biaxial Potassium Titanyl phosphate (KTP) crystal. Furthermore, by using rotating polarizer-analyzer method, we have tried to develop a more accurate and easy to use approach. The method used in this work can be used in situ real-time measurements.The degree of Anisotropy is determined to be 7.4 × 10−3 ± .0001enUsing Rotating Polarizer-Analyzer RAS MethodThesis