Solar multi-conjugate adaptive optical system

Abstract

The invention provides a solar multi-conjugate adaptive optical system. The solar multi-conjugate adaptive optical system comprises a lower atmospheric wave front sensor, a middle and upper atmospheric wave front sensor, a lower atmospheric wave front corrector, a middle and upper atmospheric wave front corrector, a wave front controller, an optical relay system, an imaging subsystem and other necessary optical components. The system has the advantages that sunspots or grain structures on the surface of the sun are taken as beacons and wave front detection is conducted on multiple areas at the same time, so as to obtain wave front distortion caused by turbulence in a large field range; wave front aberration caused by different turbulent layers is calculated by utilizing a tomography algorithm; and at last, the wave front correctors positioned in conjugate positions of the corresponding turbulent layers are controlled to correct the atmospheric turbulence in a layered manner, so as to finally realize high-resolution imaging in the large field range. The solar multi-conjugate adaptive optical system has the advantages that the sequence of the conjugate positions of the high and the lower turbulent layers is adjusted through the optical relay system, so that the lower turbulent layer is firstly compensated and corrected and the accuracy of the detection and the correction is increased; and due to the use of the tomography algorithm, errors caused by the coupling of the wave front aberrations of the different turbulent layers are reduced.

Description

technical field [0001] The invention relates to a multi-layer conjugate adaptive optical system with large-field wavefront detection and multi-layer correction, belonging to the technical field of adaptive optics. Background technique [0002] After more than 30 years of development, adaptive optics (AO) technology has played a pivotal role in many fields. In the field of astronomical applications, AO technology has become an indispensable part of large-aperture ground-based night astronomical telescopes and solar telescopes. However, limited by the halo area, adaptive optics technology can only obtain high-resolution imaging in a small range, which severely limits the application of AO technology in large field of view observation occasions. In night astronomical observation, it is impossible to find a guide star that meets the observation brightness requirements in a small area, so that in the case of natural guide stars, the airspace range of AO observations is severely ...

AI Technical Summary

Problems solved by technology

However, the MCAO test system developed by NSO in the United States uniformly controls the detection and correction of the wavefront aberration caused by the two-layer turbulence, but its structural design does not consider the adjustment of the position of the wavefront corrector in the upper and lower layers, that is, it does not adjust through the optical relay system. The positions of the two layers of calibration lead to large errors in the system calibration. So far, the test system has not yet achieved very satisfactory observation results.

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