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Adaptive optical correcting device and method based on sodium layer structured beacon

A technology of adaptive optics and correction devices, applied in the field of adaptive optics, can solve the problems of high density of backscattered photons and small detection range

Active Publication Date: 2016-01-06
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

It can be seen that the small detection range and the high requirement for backscattered photon density are two inherent problems that need to be solved urgently in the current sodium laser guide star adaptive optics technology.

Method used

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  • Adaptive optical correcting device and method based on sodium layer structured beacon
  • Adaptive optical correcting device and method based on sodium layer structured beacon
  • Adaptive optical correcting device and method based on sodium layer structured beacon

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like figure 1 As shown, the adaptive optics correction device based on the sodium layer structured beacon in this embodiment includes the following parts: a structured sodium laser beam array generating device composed of a 589nm sodium laser 11, a grating 12, and a collimating lens 13, and a tilting mirror 21. A telescope system composed of a lens 22, a pendulum mirror 23, and a transceiver telescope 24, a wavefront distortion extraction device composed of a beam splitter 31, a No. 1 focusing lens 32, a No. 1 CCD camera 33, and a computer 34, and a deformable mirror 41. 589nm Filter 42, No. 2 focusing lens 43, No. 2 CCD camera 44, and computer 34 form the wavefront distortion correction device.

[0027] The specific work process of this embodiment is as follows:

[0028] The first is to generate and emit a structured sodium laser bea...

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Abstract

The invention discloses an adaptive optical correcting device and method based on a sodium layer structured beacon, belonging to the adaptive optical technology research field, and is used for detecting and correcting wavefront distortion caused by atmospheric turbulence. The adaptive optical correcting device comprises a structured sodium laser beam array generating device, a ground telescope system, a wavefront distortion extraction device, and a wavefront distortion correcting device. The correcting device and method do not exist focusing anisoplanatism effects, do not require a separate aperture mode with a hartmann sensor as a representative to detect a wavefront, receive backward diffusion photons in a full aperture mode, thereby have low requirements for backward diffusion photon density, and are especially suitable for a large field of view. The invention provides a brand new wavefront distortion extraction method for the large aperture foundation telescope adaptive optical technology.

Description

technical field [0001] The invention belongs to the technical field of adaptive optics, and in particular relates to a device and method for adaptive optics correction of optical wavefront distortion based on a sodium layer structured beacon. Background technique [0002] When the light beam propagates in the atmosphere, due to the influence of atmospheric turbulence, the light wavefront will be randomly distorted, resulting in the decrease of the imaging resolution of the large-aperture ground-based astronomical telescope, and the blurring of the observation target outside the atmosphere. The effect of atmospheric turbulence on the large-aperture ground-based astronomical telescope is equivalent to dividing it into many diameters equal to the atmospheric coherence length r 0 The effective coherent aperture of a large-aperture astronomical telescope is equal to the size of the sub-aperture. In general, the atmospheric coherence length r in the visible band under good weathe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/0025
Inventor 王红岩罗瑞耀李礼航张煊喆宁禹许晓军
Owner NAT UNIV OF DEFENSE TECH
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