Transitional grey level driving method for increasing response speed of liquid crystal wave-front corrector

A wavefront corrector and response speed technology, applied in the field of adaptive optics, can solve problems such as slowing down

Active Publication Date: 2012-07-04
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, when performing adaptive wavefront correction, the liquid crystal response process of each pixel on the liquid crystal wavefront corrector is not synchronized, resulting in slower overall wavefront correction

Method used

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  • Transitional grey level driving method for increasing response speed of liquid crystal wave-front corrector
  • Transitional grey level driving method for increasing response speed of liquid crystal wave-front corrector
  • Transitional grey level driving method for increasing response speed of liquid crystal wave-front corrector

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Embodiment Construction

[0031] In order to understand the present invention more clearly, the transition gray level driving method will be described in detail below in conjunction with the implementation.

[0032] 1) The laser 1 is a semiconductor laser with a wavelength λ=785nm.

[0033] 2) Collimation The collimating lens 2 and the focusing lens 5 are both doublet lenses with a focal length of 100 mm and an aperture of 25 mm.

[0034] 3) Polarizer 3 is a polymer polarizer with an aperture of 25 mm and an extinction ratio of 500:1.

[0035] 4) The liquid crystal wavefront corrector 4 is a nematic liquid crystal pure phase wavefront corrector made by BNS Company of the United States, with 128×128 pixels, so it is determined that j=1, 2, 3, . . . in the grayscale image ., 128 2 ; Using the usual driving method, the liquid crystal wavefront corrector 4 has a response time of 3ms, an aperture of 6.14mm, a center correction wavelength λ=785nm, and a phase modulation value of 1.2λ. The corresponding re...

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Abstract

The invention belongs to the field of adaptive optics, and discloses a transitional grey level driving method for increasing response speed of a liquid crystal wave-front corrector. The transitional grey level driving method is characterized in that phase modulated quantity of the liquid crystal wave-front corrector is set to range from 1.2 wavelengths to 1.6 wavelengths, a grey level of a transitional phase is set for an optional group of initial phase and target phase on pixels, the grey level is larger than difference of the initial phase and the target phase, the characteristic that phase response speed of liquid crystal at a front stage is fast is adopted, the position corresponding to a target is reached, and at the moment, a grey level corresponding to the target phase is applied to the target so as to keep a target phase value. The key of the transitional grey level driving method is measurement to a transitional grey level array GT by the liquid crystal front-wave corrector, an initial grey scale and a transitional grey scale corresponding to a target grey scale are solved in real time according to the GT, accordingly, the liquid crystal front-wave corrector can be driven by the transitional grey level to quickly respond in place, the target grey scale is applied, wave front is stabilized, and driving of the next period can be carried out.

Description

technical field [0001] The invention belongs to the technical field of adaptive optics, and relates to an optimization technology for the driving process of a liquid crystal wave front corrector, in particular to a transition gray level driving method for improving the response speed of the liquid crystal wave front corrector. Background technique [0002] The function of the optical wavefront adaptive correction system is to compensate and correct the distorted wavefront of the incident light in real time to obtain ideal optical imaging. [0003] The liquid crystal wavefront corrector based on the nematic liquid crystal material adopts the mature microelectronic technology preparation process and has the characteristics of high pixel density. It not only has high correction accuracy, but also can use the kinoform technology to correct the wavefront, and only needs one wavelength. The absolute phase modulation amount can correct the distorted wavefront with a depth of 10 wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133
Inventor 宣丽穆全全彭增辉胡立发曹召良胡红斌刘永刚姚丽双李大禹夏明亮杨程亮鲁兴海
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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