Fundamental algorithm and computational codes for the light beam propagation in high power laser system

摘要

The fundamental algorithm of light beam propagation in high powerlaser system is investi- gated and the corresponding computationalcodes are given. It is shown that the number of modulation ring dueto the diffraction is related to the size of the pinhole in spatialfilter (in terms of the times of diffraction limitation, i. e. TDL)and the Fresnel number of the laser system; for the complex lasersys- tem with multi-spatial filters and free space, the system can beinvestigated by the reciprocal rule of op- erators.