Measurement of thermal lensing effects in high power thin disk laser

Two different experimental methods for disk characterization in thin disk lasers are investigated in this paper. First method is based on the stability regions in optical resonator and the second method is based on using an expanded probe beam. Both of the mentioned techniques are used to determine the thermal lensing effects in high power thin disk laser. The results of the experiments are presented and analyzed. Also the advantages and disadvantages of each method are explained.