Research On The Key Technology Of Laser Communication Optomechanical Components Between Multiple Points At The Same Time

Space information transmission technology is an important part of building a space information network.The communication technology using the laser as the information carrier has significant advantages such as high transmission rate,large information capacity,strong confidentiality,and strong anti-interference and interception capabilities.The laser communication terminal must have the ability of precise beam alignment and stable and reliable laser transmission and reception functions.At the same time,it should also have the characteristics of lightweight and compact structure.This article is based on the need to develop a laser communication terminal optical-mechanical component with high optical energy utilization,miniaturization,simultaneous,and multiple points,and develops several key technical studies for the optical-mechanical structure of the terminal.It mainly includes the following aspects:First,the overall scheme design of laser high-speed information transmission system between multiple points at the same time.Due to the small beam divergence angle of laser communication,when a central user in a spatial information network needs to perform high-speed data transmission with multiple users at the same time,a time-sharing mode or point-to-point communication is usually used.This situation severely limits the wide application of laser communication technology in spatial information networks.Therefore,the project team proposes a new laser high-speed information transmission system for multiple space-oriented platforms at the same time.Secondly,in order to solve the technical problem of bearing loads on both ends of the optical antenna in the solution,the project team proposed a loadable laser communication optical antenna for a satellite platform.Orthogonal experimental design is used to optimize the design of the main mirror assembly,and the adhesive of the mirror is designed without heating.The finite element analysis shows that Under the condition of(20±5)? ambient temperature,1g axial self-gravity and bearing load at both ends,the RMS(root mean square error)of the primary mirror is ?/65 and the PV(maximum peak-to-valley error)is ?/14,the maximum inclination of the secondary mirror is 1.21?.The Zygo interferometer was used for testing.The quality of the load and the position of the center of gravity were simulated by the mass.The results show that the system wavefront aberration of the system RMS can meet the index requirements of ?/15 under the condition of 1g gravity and load.Thirdly,the optical-mechanical-thermal integrated analysis method was used to design and analyze the thermal stability of the optical-mechanical components.Under the temperature load of(20±5)?,the MTF(Modulation Transfer Function)of each field of view of the optical path component at 20 lp / mm is greater than 0.6,which has good imaging quality.Secondly,dynamic analysis of the whole machine of the laser communication optical machine component,the first order natural frequency is84.234 Hz Under the dynamic environment of low-frequency sinusoidal vibration and random vibration,the dynamic response magnification of the structure is small,indicating that the whole machine has good dynamic stiffness.Finally,to ensure the terminal has good optical imaging quality and establish a stable communication link,the key optical performances such as the light energy utilization rate and the focal length of each optical path of the rear optical path component are tested.At last.This paper proposes an installation and adjustment scheme for the optical-mechanical components of the multiple points,transceiver composite,and multi-optical axis laser communication terminal,and completes the alignment of the optical axis parallelism.