Method for designing light beam folding type liquid crystal adaptive optical system

A liquid crystal adaptive and optical system technology, applied in the field of adaptive optics, can solve the problems of size increase and volume increase, and achieve the effect of avoiding misalignment and small volume

Active Publication Date: 2014-08-06
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, as the aperture of the telescope increases, the size of the optical elements in the liquid crystal adaptive optics system

Method used

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  • Method for designing light beam folding type liquid crystal adaptive optical system
  • Method for designing light beam folding type liquid crystal adaptive optical system

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Embodiment Construction

[0015] The reflective liquid crystal adaptive optics system is designed to match the 2-meter aperture telescope, and the focal length of the telescope is 196 meters. figure 1 , figure 2 The specific parameters of each component are as follows:

[0016] 1) The first parabolic mirror 2, the second parabolic mirror 6, the third parabolic mirror 12, and the fourth parabolic mirror 13 are all off-axis parabolic mirrors, with diameters of 100mm, 50mm, 50mm, and 50mm, respectively, and radii of curvature of 3332mm, 1940mm, 1940mm, 920mm, the focal lengths are 1666mm, 970mm, 970mm, 460mm respectively, and the off-axis distances are 300mm, 120mm, 120mm, 150mm respectively; A guide rail for the optical axis so that it can be moved up and out of the optical path along the guide rail.

[0017] 2) The first lens 8 , the second lens 15 , and the third lens 16 are double-cemented achromatic lenses, with apertures of 60mm, 20mm, and 20mm, and focal lengths of 350mm, 62mm, and 62mm, respect...

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Abstract

The invention belongs to the field of adaptive optics, and discloses a method for designing a light beam folding type liquid crystal adaptive optical system. As is shown in figure 1, a plurality of off-axis parabolic mirrors and reflectors are introduced and combined to fold light beams many times, and the size of the system is reduced. Due to the fact that a Hartmann detector and a liquid crystal corrector are under feedforward control, the feedforward control should be switched into feedback control when signal measurement is responded, the fourth off-axis parabolic mirror 13 is removed out of a light path, emergent parallel light beams aligned to the third off-axis parabolic mirror 12 are inserted into the fifth reflector 18 which is arranged by 45 degrees in a detection branch, light beams passing through the liquid crystal corrector 10 enter the Hartmann wavefront detector 17 after axis folding, light beams emitted out of a third lens 16 are cut off, and meanwhile a fast galvanometer 4 is only adopted as a common reflector. An adaptive imaging light path and a liquid crystal corrector response signal measurement light path can be switched, and the alignment misplacing problem of a middle light path of the adaptive system after and before switching is avoided well.

Description

technical field [0001] The invention belongs to the field of adaptive optics, and relates to a design method of a light beam folded and compact liquid crystal adaptive optics imaging system. It involves the combined structure of optical elements such as parabolic mirrors, reflectors, dichroic mirrors, and PBS beam splitters, and key elements in adaptive optics systems such as liquid crystal wavefront correctors, Hartmann wavefront detectors, and fast galvanometers. It is said to be a design method of a liquid crystal adaptive optics imaging system equipped with a beam folding optical structure of a large-aperture ground-based telescope. Background technique [0002] The liquid crystal adaptive optics system can compensate and correct the optical wavefront distortion caused by the atmosphere in real time and restore the high-resolution imaging of the telescope, so it has important applications in large-aperture ground-based telescopes. However, as the aperture of the telesco...

Claims

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Application Information

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IPC IPC(8): G02B26/06
Inventor 宣丽穆全全曹召良李大禹刘永刚夏明亮胡立发彭增辉杨程亮姚丽双徐焕宇王玉坤王少鑫鲁兴海
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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