Measurement and simulation of wavefront deformation and spectral shift induced by high power CW laser in thin film optical filters

This study discusses absorption in thin film optical filters and its impact on spectral shift and wavefront deformation under high power laser exposure. An experimental set-up has been developed for measuring both absorption and wavefront deformation of optical thin film components. Additionally, a finite element model has been developed to predict optical function spectral shifts and wavefront deformations induced by high power laser exposure. Comparison between theoretical predictions and measured data is used to validate the model and provide valuable insights into the consequences of laser-induced heating on the optical performances of coatings.