Monte Carlo simulation of laser illumination system using return photon counts

In order to further study the performance of laser illumination systems, a Monte Carlo simulation system is established for the return photons when laser illuminating the target. The physical process of photons from the emission to reception is simulated. The laser illumination system involves vacuum laser transmitting, atmospheric turbulence and return photons processing. Based on the simulation system, the quality of the laser far field spot is verified and the character of return photons is analyzed. The simulation results demonstrate that the simulation system performs well and satisfy requirements for research of laser illumination system with atmospheric turbulence.