System and method for high repetition frequency wavefront distortion correction of sodium-guided star group

Abstract

The embodiment of the invention provides a sodium guide star group high-repetition-rate wavefront distortion correction system and a correction method. The system comprises a microsecond pulse sodium guide star laser group (1), an n-dimensional overlapped data analysis unit (9), an n-dimensional overlapped sampling imaging unit (10) and a control unit (11). The control unit (11) controls each wavefront detector to receive backscattered light of a corresponding sodium guide star in a preset time period after a corresponding microsecond pulse sodium guide star laser transmits microsecond pulse laser in an interval order through a transmitting unit, interference of Rayleigh scattering light is thus eliminated, the signal-to-noise ratio of the backscattered light is improved, mutual crosstalk between multiple sodium guide stars and multiple Rayleigh scattering light columns is avoided, the repetition rate detection in a lower atmosphere can be improved, and the correction precision is further improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of adaptive optics correction, and more specifically, to a system and method for correcting high-repetition-frequency wavefront distortion of sodium-guided constellation constellations. Background technique [0002] When the telescope observes the target through the atmosphere, the wavefront of the target signal light is disturbed by the atmospheric turbulence and the wavefront is distorted, which leads to the resolution of the large ground-based telescope being much lower than the theoretical value. Adaptive optics technology can be used to correct these disturbance factors, so that the telescope can achieve theoretical diffraction-limited resolution, which is especially necessary for large-aperture astronomical telescopes with extremely high theoretical diffraction-limited resolution. [0003] Adaptive correction needs to use the bright star in the sky as the guide star to obtain the ...

AI Technical Summary

Problems solved by technology

[0007] 1) Using a continuous wave laser to generate a sodium guide star will cause Rayleigh scattering interference in the lower atmosphere below 50km, and it is difficult to eliminate;

[0008] 2) Sodium guide stars are used. Due to the existence of multiple laser beams, there is a problem of crosstalk between multiple sodium guide stars and multiple beams of Rayleigh scattered light.

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