Effect of filtering on processing of thermal lens fringes by single sideband modulation technique

This paper proposes the use of single sideband modulation technique with Gaussian and band pass filters for the analysis of the thermal lens fringe to obtain the map of the refractive index change.. Maps of the refractive index and phase change are achieved by using single side band modulation technique with Gaussian and band pass filters. Consequently, it is seen that single side band modulation technique with Gaussian filter shows more accurate results.