Simulation study on laser damage threshold of optical window materials

Abstract

Some key issues in the process of simulating millisecond laser damage to K9 glass based on Multiphysics field simulation are analyzed through several aspects such as the establishment and meshing of the millisecond laser damage K9 glass finite element model, loading of the pulsed laser, setting the initial conditions and boundary conditions. The finite element model of K9 glass damaged by millisecond laser was established, and the temperature and stress distribution of K9 glass irradiated by millisecond laser were numerically analyzed. The calculation results show that the spot radius and pulse frequency have a greater influence on the damage effect, the higher the frequency, the greater the thermal stress generated, and the stronger the damage effect; the larger the laser spot radius, the smaller the thermal stress generated, and the weaker the damage effect. Therefore, the laser damage threshold will be the spot radius, the pulse frequency of the regular change, that is, with the pulse frequency and spot radius increases, the damage threshold decreases.