A Method for Measuring All Parameters of One-Dimensional Liquid Crystal Grating
A liquid crystal grating and measurement method technology, applied in the direction of testing optical properties, etc., can solve the problems of difficulty in measuring specific parameters, inability to measure one-dimensional liquid crystal gratings at one time, redundant measurement steps, etc. The effect of reducing sources of error
Active Publication Date: 2020-01-21
北京至格科技有限公司
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Problems solved by technology
[0004] Existing methods for measuring the parameters of one-dimensional liquid crystal gratings require a variety of measuring instruments or devices, and they all measure one or two parameters of one-dimensional liquid crystal gratings. The measurement steps are redundant, and some measurement methods are destructive. It is difficult to measure some specific parameters, and it is impossible to measure all the parameters of the one-dimensional liquid crystal grating at one time
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Embodiment 1
[0046] In order to test the quality of the one-dimensional liquid crystal grating produced by the factory, it is necessary to accurately measure the full parameters of the one-dimensional liquid crystal grating. The parameters of the one-dimensional liquid crystal grating measured in this example are unknown. It is known that the e-axis refractive index and the o-axis refractive index of the liquid crystal molecules of the liquid crystal grating are respectively At a wavelength of 550nm, the e-axis refractive index and o-axis refractive index are respectively The flow chart of one-dimensional liquid crystal grating measurement is as follows: figure 1 The specific measurement steps are as follows.
[0047] Step 1: Based on the liquid crystal linear grating model, construct a liquid crystal grating mathematical model, and obtain the liquid crystal grating diffraction efficiency formula (1) for Fraunhofer diffraction.
[0048] Liquid crystal linear grating model such as fig...
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Abstract
The invention relates to a method for measuring all the parameters of a one-dimensional liquid crystal grating and belongs to the technical field of photoelectric measurement. According to the methodof the invention, a liquid crystal grating linear model is constructed, and a liquid crystal grating diffraction efficiency formula of Fraunhofer diffraction is obtained; a diffraction efficiency measuring device is used to measure 0-level, +1-level, and +2-order diffraction efficiency and diffraction angles under two wavelengths close to each other; an equation set containing liquid crystal grating parameters is constructed, and all the parameters of the liquid crystal grating are calculated; and calculation results are verified. The method of the invention has the advantages of simple measuring steps and non-destructive performance. According to the method, only the grating diffraction efficiency measuring device is adopted to measure the diffraction efficiency of the liquid crystal grating, so that all the parameters of the liquid crystal grating can be obtained. With the method adopted, measurement links for measuring a plurality of parameters of the liquid crystal grating can be decreased, measurement time for measuring all the parameters of the liquid crystal grating can be shortened, error sources can be effectively reduced, and final measurement results are verifiable.
Description
technical field [0001] The invention relates to a method for measuring all parameters of a one-dimensional liquid crystal grating, belonging to the technical field of photoelectric measurement. Background technique [0002] Liquid crystal grating is a kind of diffractive optical element based on liquid crystal birefringence effect, which is widely used in the fields of display, optical communication, optical information processing, adaptive optics and wavefront correction. Compared with traditional gratings, liquid crystal gratings can adjust the polarization state of incident light, and have the advantages of small size, low cost, and high accuracy of wavefront modulation. A one-dimensional liquid crystal grating refers to a liquid crystal grating with a periodic spatial structure in one dimension. The full parameters of the one-dimensional liquid crystal grating include grating constant, duty cycle, liquid crystal layer thickness, amplitude transmittance of two adjacent r...
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IPC IPC(8): G01M11/02
Inventor 胡摇付诗航郝群赵亚如鹿丽华
Owner 北京至格科技有限公司
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