Sodium beacon pre-correction system based on ultra-short pulse multilayer conjugate adaptive optics

Abstract

The invention discloses a sodium beacon pre-correction system based on ultra-short pulse multilayer conjugate adaptive optics. The system comprises an ultra-short pulse sodium beacon laser, a beam expanding lens, an optical splitter A, an inclined reflector, at least two stages of optical path conjugated turbulence correction units, a beam expanding lens group, a sodium beacon transmitting telescope, an inclination detector and an inclination controller. The turbulence correction unit comprises an optical splitter B close to the transmitting end and a deformable mirror located between the optical splitter B and the beam expanding lens set, the optical splitter B is provided with a turbulence detector corresponding to the optical splitter B, the turbulence detector is provided with a turbulence controller matched with the turbulence detector, and the turbulence controller is used for controlling the deformable mirror corresponding to the turbulence controller. The layered detection andconjugate correction are carried out on the uplink path turbulence, so that the amplitude and phase fluctuation generated by the uplink path turbulence is effectively overcome, the sodium beacon lightspot expansion and flicker effects are avoided, and the method is easy to implement, is wide in application range, is capable of effectively improving the correction performance of the observation telescope rear-end AO system and the like.

Description

technical field [0001] The invention relates to an adaptive optics system, in particular to a sodium beacon pre-correction system based on ultrashort pulse multilayer conjugate adaptive optics. Background technique [0002] Astronomical telescopes are powerful tools for exploring black hole physics, dark matter, dark energy, the origin of celestial bodies, the origin of the universe, and the origin of life. In order to further deepen the understanding of the above issues, it is the eternal pursuit of human beings to continuously improve the resolution of telescopes. The powerful means are Large-aperture ground-based telescopes are used for observation, so the caliber of the telescopes continues to increase. At present, the caliber of large-aperture ground-based telescopes under construction has reached the order of 30m. [0003] However, due to the influence of atmospheric turbulence over the earth, the wavefront of the observation target changes from a plane wavefront to a ...

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Problems solved by technology

[0006] However, due to the presence of atmospheric turbulence in the uplink path of the sodium laser, on the one hand, the wavefront phase of the uplink sodium laser is distorted, and the sodium beacon spot is blurred and expanded; on the other hand, the turbulence near the surface is the strongest, and the Transmission, through Fresnel diff

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