The Simulation Of Optical Field Uniformity And Evaluation Of Ld-Side-Pumped Club-Shaped Medium

The pumping optical field distrihbution is an important factor on affecting the output of Laser. The uniform distribution is a premise to achieve high beam quality. Optical field distrihbution uniformity internal the Nd:YAP crystal side-pumped by Laser Diode-array is studied in this paper. Therefore, the research provides a theoretical basis to improve the beam quality and optimize of the Laser structure design.Starting with the physical process of Laser Diode-array, a pumping model and an evaluation method of root-mean-aqure are set up by using the methods of ray-tracing, according to the Gaussian-shaped theory of the pumping light and the natural birefringence of Nd:YAP crystal. Then, according to the theories and the evaluation method above, the pumping optical field distributions internal the anisotropic dual axle Nd:YAP crystal are simulated by MATLAB software in the different situations of parameters, which contain the pumping distance, the crystal radius and the absorption coefficient of Nd:YAP crystal. The uniformity of the pumping optical field distributions are estimated by the evaluation method of root-mean-aqure.An experimental platform for the pumping optical field distribution study internal the Nd:YAP crystal side-pumped by Laser Diode-array is built. Fluorcence flare of Nd:YAP crystal are measured by beam quality analyzer in different temperatures. Comparing the measurement results with the simulation results, the two are consistent to each other.