THERMAL EFFECTS ON THE LD END-FACE PUMPED ND:YAG LASER MEDIUM

Solid-state lasers are widely used in various industries due to their high stability, compact structure, and excellent beam quality. However, thermal effects have long been a significant constraint on improving laser performance. Thermal effects are primarily caused by the heat deposition resulting from the absorption of pump energy by the laser medium in solid-state lasers. Studying the heat conduction equation of the laser medium is crucial for understanding thermal effects. This paper provides a detailed theoretical derivation for calculating the heat conduction equation of the laser medium in solid-state lasers. A series expansion is used to derive the analytical expression for the heat conduction equation, and the fourth-order Runge-Kutta method is employed to numerically solve it. The temperature simulation results of the laser medium end face using both methods are compared to verify the correctness of the analytical derivation process and to analyze the causes of any errors.