Characteristic parameters scaling system for liquid crystal phase variable delay device

Abstract

The invention relates to a characteristic parameter calibrating system for a liquid crystal variable retarder (LCVR), which comprises a tunable ion laser, an achromatic wave plate, a polarizer, an analyzer, an electric control cabinet, an LCVR driver, an optical power meter and a computer. When light vertically radiates the liquid crystal variable retarder, the drive voltage of the liquid crystal variable retarder is modulated continuously to obtain a corresponding light intensity curve diagram; the Mueller matrix expression of the calibrating system is established by utilizing maximum light intensity value in the curve diagram and light intensity value under measured voltage to obtain the phase delay expression of the liquid crystal variable retarder under the measured voltage; when the light does not vertically radiate the liquid crystal variable retarder, the angles of the polarizer and the analyzer are modulated; and a Stokes vector expression is established by utilizing light intensity value detected under different adjusting states to obtain the phase delay and fast axis direction expression of the liquid crystal variable retarder under specific voltage. The invention has the capacity of calibrating the characteristic parameters of the liquid crystal variable retarder. When the light vertically radiates, the polarizer and the analyzer are not required to be rotated during the calibrating process; and when the light does not vertically radiate, constant incident intensity is ensured during the calibrating process by utilizing the achromatic wave plate, so that the calibration accuracy is improved.

Description

technical field [0001] The invention relates to a liquid crystal phase variable retarder (LCVR) characteristic parameter calibration system. When the light is vertically incident on the LCVR, measure the phase delay of the LCVR at a certain wavelength and at different voltage values; when the light is incident on the LCVR in a non-perpendicular direction, measure the LCVR at a certain wavelength, a certain voltage value, and different incident angles The amount of phase delay and the angle of the fast axis when . Background technique [0002] LCVR is an optical device based on the electronically controlled birefringence characteristics of liquid crystals. It uses nematic liquid crystal materials. Anisotropic nematic liquid crystal molecules have a uniaxial birefringence effect. When an appropriate voltage is applied, the liquid crystal molecules begin to Flipping, the birefringence effect gradually decreases, and the phase delay also gradually decreases, realizing the phase...

AI Technical Summary

Problems solved by technology

[0003] The technical problem of the present invention is: to overcome the deficiency that the phase delay of the LCVR can only be measured when the light is vertically incident in the existing technology of measuring the phase delay, and utilize the electronically controlled delay characteristic of the LCVR to construct a method that can accurately measure the LCVR at different voltage values ​​and different Phase delay under incident angle and calibration system of LCVR fast axis angle

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