Abstract:

We apply pulse laser pumped to the laser crystal of quasi three level system with severe thermal effect. We also introduce a rectangular wave function into a Poisson equation. We further establish the thermal conduction model and its boundary conditions of a cylindrical laser crystal Nd:YAG, based on the convection heat transfer between crystal profile and coolant and the heat transfer between crystal terminal face and externality. We then employ finite element difference method to solve the deformed Poisson equation, and obtain the temperature construction process in the laser crystal and the critical stable temperature field distribution. Results show that pulse pump can significantly decrease the internal temperature of a crystal, and effectively reduce its internal heat effect. This paper provides a reference for the research on the thermal effect of quasi three level and threelevel laser crystal.

Key words: pulse pumped, quasi three level, Poisson equation, thermal effect