Optimized Design Of Reflective Optical Antenna Used In Satellite Laser Communication System

With the research for the new beam controller, ultra-stable lasers, data receiver with high rate and advanced electronic equipment for communication which is suitable for space is mature and applied, satellite laser communication technology has developed rapidly. Satellite laser communication technology, whose carrier is laser, is a communication link with high speed and large-capacity, which is built between planets, between planet and the earth. Compared with microwave communication, the advantages of satellite laser communication are: small volume, light weight, large capacity of information and strong anti-interference ability and etc. For the satellite laser communication of point to point, optical antenna is the key point of the satellite laser communication system, which affects the link of laser directly, large field of optical system can reduce the time effectively of link connection, so the study of optical system design is of great significance.Object of this paper is the optical system of satellite laser communication terminal, the target of research is to design large field of satellite laser communication optical system. The main contents are as follows:First of all, this way paper overviews the research progress and parameters of domestic and foreign satellite laser communication terminals, and analyzes the theory of coaxial two-mirror system and three-mirror system, and compares several popular optical systems used in satellite laser communication.Secondly, Based on the characters of shared transmitting and receiving satellite laser communication system, this paper derives the aberration expression and conditional expression and summaries the features of design. According to aberration conditional expression, two kinds of coaxial with two different cover ratio systems are designed. The image quality, advantages and disadvantages of each system are also analyzed.Thirdly, based on the coaxial two reflective optical system, design a off-axis two reflective optical system with focal length of500mm, aperture of100mm, field of3mrad.In the end, because two reflective optical system lacks free parameters, there is a contradiction between field and aberration correction, limits improve the field of system further. Finally, the three reflective optical system is discussed, and the relationship of outline dimensions and structural dimensions is given. Design a off-axis three reflective optical with focal length of500mm, aperture of100mm, field of1.21.2,the image quality is also analyzed.