Novel laser sodium guide star system

Abstract

The invention provides a novel laser sodium guide star system. The novel laser sodium guide star system comprises a laser transmitting module, a signal receiving module, a system control module and a near space vehicle platform. The near space vehicle platform is arranged in the airspace which is 20km above the ground and below the sodium layer in the upper atmosphere. The laser transmitting module is arranged on the near space vehicle platform. Lasers transmitted by the laser transmitting module irradiate sodium atoms in the sodium layer in the upper atmosphere to generate resonance fluorescence, a sodium guide star is obtained, and the lasers are then received by the signal receiving module. The laser sodium guide star system is constructed on the basis of the near space vehicle platform, the luminance of the laser sodium guide star is greatly improved on the basis of existing laser source power, the influences of atmosphere turbulences on light beam transmission are effectively avoided, the obtained laser sodium guide star is higher in position stability and small in error, the correction effect and work performance of a self-adaption system can be improved, and the novel laser sodium guide star system has great market popularization value.

Description

technical field [0001] The invention belongs to the technical field of adaptive optics, relates to a guide star system in the technical field of adaptive optics, and more specifically relates to a laser sodium guide star system with a new structure. Background technique [0002] Adaptive optics technology is a technology produced and developed to solve the problem of atmospheric turbulence disturbance. This technology can overcome the influence of various dynamic and static error factors of the optical system in real time, and keep the ability of the optical system to always work in a good state. In the laser free communication , high-resolution imaging of optical telescopes, aerospace and military and other fields have been widely used. Having a bright guide star is the basis for the adaptive optics system to work, but the dim brightness and low space coverage of natural stars limit the application of adaptive correction technology in natural conditions. In order to overco...

AI Technical Summary

Problems solved by technology

Although it is better than Rayleigh guide stars in focusing anisotropy and detection range, traditional laser sodium guide stars still have the following defects: First, the laser beam emitted by laser source 1 will be affected by atmospheric turbulence during its upward transmission As a result, the light spot is diffused and the volume of the sodium guide star increases. Therefore, under a certain sub-aperture resolution, the increase in the volume of the laser sodium guide star will affect the correction effect of the adaptive system; secondly, during the uplink transmission of the laser beam, Drift will occur due to the influence of atmospheric turbulence disturbance, resulting in the position of the sodium guide star is not fixed, increasing the system error; in addition, because the 589nm laser is difficult to achieve high power in engineering and manufacturing, and the earth's near-surface atmosphere and aerosols are harmful to the 589nm laser The extinction effect of the laser sodium guide star system is relatively serious, so that the overall sodium guide star brightness of this laser sodium guide star system in the prior art is low, and these defects have a certain impact on the application of the laser sodium guide star system in the field of adaptive optics technology

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