Wave surface distortion-free free space remote laser transmission simulation device

Abstract

The invention discloses a wave surface distortion-free free space remote laser transmission simulation device. In the device, optical Fourier far field transformation is realized by adopting a long focal length Fourier lens; light field remote transmission simulation is realized by adopting single-stage single-lens imaging and amplifying, optical fiber sampling, optical fiber attenuation and laser collimation; and simulation of vibration of a satellite platform is realized by adopting vibration of an output optical fiber head. By the device, conversion of a light beam from near field distribution to far field distribution can be simulated under a laboratory space scale, and the simulation of the vibration of the satellite platform is realized at the same time. The device is mainly used for communication between two satellite laser communication terminals as well as ground detection and verification of the tracking and pointing performance, has the advantages of simple structure, low cost and wide applicability range, and is easy to adjust.

Description

technical field [0001] The present invention relates to the fields of space laser communication, space laser radar and space laser weapons, especially a device for simulating long-distance transmission of laser beams in free space, which is mainly used for the simulation and analysis of the characteristics of laser emission wavefronts in space laser application systems in the far field. test. Background technique [0002] Space laser application systems, including space laser communication, space laser radar, and space laser weapons, all have very high requirements on the laser emission wave surface, because the distance between the emission terminal and the target is very long, which belongs to the space far field Therefore, its far-field distribution needs to be focused on in the performance of the entire system. For space laser communication, the far-field distribution directly determines the performance of the laser communication link, and ultimately affects the communi...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic and foreign simulations of long-distance laser beam transmission in free space basically use the Fourier transform objective lens to convert the near-field wave surface of the transmitting terminal into its reduced far-field distribution on the focal plane, and then use the principles of imaging magnification and proportional scaling to simulate Thousands of kilometers to hundreds of thousands of kilometers of free-space beam transmission, this scheme can accurately simulate the far-field intensity distribution pattern, but its wavefront is different from the actual far-field distribution, which is very important for space coherent laser communication and synthetic aperture laser Imaging radar won't work

Later, the Shanghai Institute of Optics and Mechanics of the Chinese Academy of Sciences and others proposed an improved simulation scheme, that is, using a 4-f imaging magnification system instead of the previous single-lens imaging magnification, which can effectively eliminate the distortion of the wavefront, but the complexity of the system is relatively high. Dressing up is more difficult

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