Lateral support structure for 600 mm primary mirror of laser communication

Li Xiaoming; Zhang Tianshuo; Zhang Jiaqi; Li Xiang; Zhang Lizhong

doi:10.12086/oee.2020.190485

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Li X M, Zhang T S, Zhang J Q, et al. Lateral support structure for 600 mm primary mirror of laser communication[J]. Opto-Electron Eng, 2020, 47(9): 190485. doi: 10.12086/oee.2020.190485

Citation:

Li X M, Zhang T S, Zhang J Q, et al. Lateral support structure for 600 mm primary mirror of laser communication[J]. Opto-Electron Eng, 2020, 47(9): 190485. doi: 10.12086/oee.2020.190485

Lateral support structure for 600 mm primary mirror of laser communication

1.
NUERC of Space and Optoelectronics Technology, Changchun University of Science and Technology, Changchun, Jilin 130022, China
2.
College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun, Jilin 130012, China

Fund Project: Supported by National Key Research and Development Program (2018YFB1107600), Condition Guarantee Project of the State Administration of Science and Technology (S2201011202)

More Information

^*Corresponding author: Li Xiaoming, E-mail:lxmkidd@163.com

Received Date 15 August 2019

Revised Date 08 November 2019

Published Date 15 September 2020

Abstract

Abstract

The main function of the laser communication large-caliber ground optical transceiver is to establish a communication link with the satellite to realize data transmission between the satellite and the ground station. The 600 mm microcrystalline primary mirror of one laser communication station is heavy, and its working angle changes constantly. In order to decrease the mirror surface error, the support system not only has a 9-pose axial support structure but also simultaneously balances the radial component of gravity of the primary mirror at its working angle by using a radial support structure. Flexible lateral support structures have large size and stress, so it is not suit for the mirror that works in a wide range of rotation. The paper researches the lateral support structure with a mercury band and central shaft, and analyses the impact of mercury band parameters on the surface error. The designed lateral structure has small size and improves the surface quality of the mirror. The measured values of PV and RMS are smaller than λ/5 and λ/37, respectively. These result shows that the designed lateral support structure reaches the design purpose and satisfies the requirements.
- laser communication /
- mercury band /
- lateral support /
- center support /
- surface error

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References

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Overview

Overview

Overview: Laser communication has the advantages of high communication rate, good confidentiality, and strong anti-interference ability, and it has become a rapidly developing new mode of communication. The satellite-ground laser communication link mainly realizes the high-speed transmission of satellite massive data. Large-caliber laser communication optical terminal is an important terminal to ensure the link performance in the satellite-ground link, and directly impacts on link communication performances. As the core component of the optical antenna of the ground station. The primary mirror surface shape accuracy directly determines the optical quality of the system. The main mirror lateral support plays a decisive role in the mirror surface shape accuracy.

The primary mirror of the laser communication vehicle ground optical terminal uses microcrystalline materials. Consideration of costs, the primary mirror lightweight design is not necessary, because the optical terminal has no strict requirements for quality. The primary mirror of laser communication stations is heavy, and its working angle changes constantly. In order to decrease the mirror surface figure, the support structure needs to meet both axial and radial gravity unloading requirements.

In order to ensure the accuracy of the surface shape, the support system not only has a 9-pose axial support structure but also simultaneously balances the radial component of gravity of the primary mirror. Flexible lateral support structures have large size and stress, so it is not suit for the mirror that works a in wide range of rotation. In this paper, in order to balance the radial gravity component of the primary mirror and reduce the size of the radial support structure, a combination of the central axis and the mercury belt is designed to balance the radial gravity component of the primary mirror. In the radial support scheme, the finite element analysis was used to analyze the influence of mercury belt parameters on the surface shape accuracy of the primary mirror. The support parameters were optimized, and the support structure was designed.

For the 600 mm microcrystalline primary mirror of the laser communication station, a composite radial support structure is designed, in which the method of combining the mercury band with the central support is adopted on the basis of the back 9-point support. The support position and structure parameters of mercury band were analyzed and optimized. After the actual application to the optical antenna primary mirror support of the laser communication ground station, the actual measurement results of the primary mirror assembly show that the designed support structure enables a surface shape error and RMS value of the primary mirror smaller than λ/5 and λ/37, respectively. The radial support fully achieves the design goal, satisfying the surface error requirements of the laser communication primary mirror.