The Effect of Temperature Gradient on the Optical Telescope System in Laser Communication

摘要

The optical telescope system that can transmit and receive laser signal is the core component of a satellite laser communication terminal. The stability of its various components in the space environment under the temperature has a significant impact on the laser communication rate, error rate, aiming accuracy and system transmission. Optical telescope in space conditions is subject to space thermal radiation and the heat conduction and thermal radiation from the relevant electrical devices, especially laser communications source (semiconductor laser power with 1-10w) in the dissemination of its own reflection. The heat absorption of the secondary mirror and its support holder results in the temperature increase on secondary mirror parts and the temperature gradient between primary and secondary mirror. In this paper, we simulated the surface accuracy of optical components and their spatial variation under the temperature gradient through finite element analysis of the optical telescope system. The simulation results have been applied to guide the implementation of the thermal control system for effectively controlling of the optical performance of optical telescope system and to meet the need of laser communications.