Thermal Effects Of Optical Antenna Under The Laser Irradiation

Due to its huge potential for communication,laser communication has increasingly become a research hotspot.Currently widely used satellite communication methods are mainly microwave communication,but due to the low communication capacity of microwave communication,the space communication capacity is greatly limited,which directly results in a large amount of satellite data that needs to be compressed before being transmitted.As a communication method with high communication capacity,laser communication is expected to completely solve this technical obstacle,replacing traditional microwave communication,and it has become the prevalent method of space communication.Currently,space laser communication has moved from the laboratory to commercial.Because laser communication works under the physical limit conditions,it directly leads to very high requirements for temperature stability and dimensional accuracy of the optical antenna.The performance of the optical antenna greatly influences the establishment and maintenance of the communication link of space laser communication.Therefore,the optical antenna needs to have good mechanical properties to ensure the normal operation of laser communication.At the same time,since the shielding ratio of the optical antenna directly affects the transmission of space laser communication,the shielding ratio is lower,and the spatial laser communication transmission is better.Reducing the shielding ratio of the optical antenna to ensure high-speed transmission of space laser communication is necessary.In this article,the traditional optical antenna secondary mirror support structure is improved and optimized.An optical antenna with a shielding ratio of 0.085 was designed.The structure has both a high basic frequency and a high stiffness.Due to the relatively strict temperature requirements in space laser communications,there are stringent requirements for temperature changes in the primary and secondary mirrors.The irradiation of the laser beam as an internal heat source on the optical antenna inevitably causes the temperature of the primary and secondary mirrors of the optical antenna to rise.To study the temperature change of the optical antenna caused by the laser internal heat source and the influence on the optical antenna,a thermal effect model of the laser antenna laser irradiation was established based on the optimized design of the optical antenna secondary mirror support structure.The method of studying the thermal effect of the laser radiation of the optical antenna was theoretically analyzed.The method of studying the thermal effect of the laser radiation of the optical antenna was theoretically analyzed.The effect was simulated by simulation software.According to the actual conditions of laser communication,the laser irradiation time is 30 min.The simulation results show that the thermal effect of the secondary mirror of the optical antenna is most obvious.According to the multi-physics software simulating the temperature distribution of the optical antenna after the thermal effect of the laser irradiation on the optical antenna,the thermal elimination design of the optical antenna was performed.Before and after the heat dissipation design was compared by simulation,the thermal effect of laser radiation on the optical antenna's secondary mirror was significantly reduced.In order to study the heat-designed optical antenna,the opto-mechanical thermal analysis method was used due to the influence of the laser-irradiated optical antenna.The data obtained by the thermal effect of the laser antenna laser irradiation is converted into an optical evaluation parameter for evaluating the performance of the optical antenna.The influence of the thermal effect of the laser radiation on the performance of the optical antenna was studied by optical evaluation parameters.