Adaptive mesh grid scaling algorithm in the simulation of laser propagation

Abstract

This paper illustrates an adaptive mesh grid scaling algorithm, which can be applied in the simulation of laser propagation. The algorithm can effectively improve the far-filed laser spot resolution in the simulation of focused laser propagation. And the algorithm's effectiveness is verified by the simulation of various laser beam type's diffraction. The phenomenon of diffraction exits in all the laser beam propagation, in which the divergence angle is directly proportional to the laser wavelength, and inversely proportional to the laser aperture. The proportion coefficients will vary depending on the type of laser beam, such as gaussian beam and flat-topped beam with different obscuration, which have accurately theoretical value. Moreover, the simulation results of adaptive mesh scaling algorithm agree well with theoretical values, which effectively checked the algorithm's feasibility and accuracy.