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

Abstract

The invention discloses a sodium beacon pre-correction system based on ultrashort pulse multilayer conjugate adaptive optics, which includes an ultrashort pulse sodium beacon laser, a beam expander lens, a beam splitter A, an inclined mirror, and at least two optical paths A conjugate turbulence correction unit, a beam expander lens group, a sodium beacon transmitting telescope, a tilt detector, and a tilt controller, the turbulence correction unit includes a beam splitter B close to the transmitting end, and a beam splitter B located between the beam splitter B and the beam expander lens group The beam splitter B has a turbulence detector corresponding to it, and the turbulence detector has a turbulence controller matching it, and the turbulence controller is used to control the corresponding deforming mirror. Through layered detection of uplink turbulence and conjugate correction, the amplitude and phase fluctuations caused by uplink turbulence can be effectively overcome, and sodium beacon spot expansion and scintillation effects can be avoided. It is easy to implement and has a wide range of applications, which can effectively improve the observation telescope. Back-end AO system correction performance, etc.

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 diffraction, the phase fluctuations produced by this layer of turbulence have been transformed into amplitude fluctuations, which will cause the flickering effect of the brightness of the sodium beacon and cause the instability of the return light of the sodium beacon, both of which will reduce the wave Reliability and accuracy of front detection

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