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Method for improving performance of beam shaper of liquid crystal light valve

A liquid crystal light valve and beam shaping technology, which is applied in optics, instruments, optical components, etc., can solve problems such as unsatisfactory beam shaping effects and distortion, and achieve the effect of improving linear response characteristics and overcoming nonlinear distortion phenomena

Inactive Publication Date: 2012-08-15
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

However, the response curve of the transmittance to the gray scale of the liquid crystal light valve beam shaper driven by the gray scale image shows serious nonlinear characteristics, which will lead to unsatisfactory beam shaping effect and distortion in practical applications.

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  • Method for improving performance of beam shaper of liquid crystal light valve
  • Method for improving performance of beam shaper of liquid crystal light valve
  • Method for improving performance of beam shaper of liquid crystal light valve

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] figure 1 It is a comparison chart of loading images between the prior art and the present invention, figure 1 shows the difference between the existing grayscale image loading method and the binary bitmap loading method, figure 1 The upper row is the grayscale loaded image transmittance target T 0 From left to right, they are 5%, 25% and 75%, and the lower row is the binary bitmap loaded image transmittance target T 0 From left to right are 5%, 25% and 75%. It can be seen that after the binarization process, the original continuous transmission objective function is discretized, and there are only two states of black and white. The spatial variation of transmittance is controlled by the position and density of black and white pixels, thus avoiding the abnormal response of liquid crystal to grayscale images. The linear characteristic effective...

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Abstract

The invention discloses a method for improving the linear response characteristic of a beam shaper of a liquid crystal light valve. A laser beam is converted into a linearly polarized light by a polarizer, the beam is spatially shaped by the liquid crystal light valve, the shaped beam enters a scientific grade CCD (charge coupled device) camera through a polarization analyzer, a spacial filter and a sampling lens the scientific grade CCD camera collects the spatial intensity distribution of the beam and inputs the spatial intensity distribution into a computer control system, a computer compares the input spatial intensity distribution of the beam with the spatial intensity distribution needed for shaping, a binary black-white bitmap is used as a regulation and control image of the liquid crystal light valve, and the transmissivity of liquid crystal light valve is changed so as to adjust the spatial intensity distribution of the beam. According to the method disclosed by the invention, the binary black-white bitmap is used as the control signal of the liquid crystal light valve, the disadvantage of the non-linear response of the transmissivity of the shaper to the gray scale can be overcome, and the dynamic range of the linear response can be enlarged, thereby improving the shaping performance of the beam. The method for improving the performance of the beam shaper of the liquid crystal light valve disclosed by the invention is suitable for the technical field of precise shaping of the laser beam.

Description

technical field [0001] The invention belongs to the technical field of laser beam precision shaping, and in particular relates to a method for improving the performance of a liquid crystal light valve beam shaper. Background technique [0002] High-power laser systems operate at higher fluxes. In order to avoid damage to the laser system due to uneven spatial distribution of the beam, a variety of beam space shaping technologies have emerged, such as sawtooth apertures, birefringent lenses, and metal masks. These shaping devices cannot realize programmable control, and the flexibility of application is not enough. The utility model patent "A Liquid Crystal Light Valve Laser Beam Spatial Shaping Device" (Chinese Patent No. 01256697.7) filed by Sui Zhan and others from the Laser Fusion Research Center of the China Academy of Engineering Physics on September 11, 2002 proposed a realization A method for programmable control of laser beam shaping. The method is characterized by...

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Application Information

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IPC IPC(8): G02B27/09G02F1/133
Inventor 谢旭东蒋东镔郝欣曾小明丁磊周凯南黄征朱启华
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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