A method and device for detecting optical characteristics of a ferroelectric liquid crystal retarder

Abstract

The invention belongs to the field of optical element detection, and specifically discloses a method and device for detecting the optical characteristics of a ferroelectric liquid crystal retarder, which includes the steps: S1, the incident polarized light passes through the ferroelectric liquid crystal retarder to obtain outgoing polarized light, and simultaneously makes the ferroelectric liquid crystal retarder The azimuth of the fast axis of the liquid crystal retarder is switched between two states, and the Stokes vector of the outgoing polarized light spectrum is measured in the two states; S2, rotating the ferroelectric liquid crystal retarder, so that the azimuth of the fast axis of the two states The angles are all increased by Δ; S3, repeat steps S1 and S2, to obtain the Stokes vectors of the outgoing polarized light spectra of multiple groups of different fast axis azimuth angles in two states, according to the Stokes vectors of the outgoing polarized light spectra and The corresponding relationship of the optical characteristic parameters of the ferroelectric liquid crystal retarder is fitted to obtain the optical characteristic parameters of the ferroelectric liquid crystal retarder. The invention can measure the optical characteristics of the FLC whose azimuth angle of the fast axis changes at a high speed, and can obtain all characteristic spectrum parameters in one measurement cycle.

Description

technical field [0001] The invention belongs to the field of optical element detection, and more particularly, relates to a method and device for detecting optical properties of a ferroelectric liquid crystal retarder. Background technique [0002] Ferroelectric Liquid Crystals (FLC) is a smectic liquid crystal whose liquid crystal phase is composed of layered long molecules arranged in the same direction. The centers of positive and negative charges in the liquid crystal do not coincide, which induces an electric dipole moment that can control the orientation of the molecules. Applying an electric field to the liquid crystal can change the polarity of the electric field on the crystal, and the direction of the molecules will also change, thereby changing the direction of the fast axis of the liquid crystal. FLC can be considered as a phase retarder or wave plate with a fixed retardation, but its fast axis azimuth has two states (state 1 and state 2), and the difference bet...

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Problems solved by technology

[0004] (1) The prior art can only characterize retarders whose optical properties such as wave plate or LCVR can remain unchanged (at least a few seconds) for a long time; such as the measurement method of CN105628343A, it can only detect optical properties such as wave plate at a specific wavelength Keep fixed optical device under; As the measuring method of CN108534993B, when detecting the optical response of LCVR under different voltages, require voltage (optical characteristic) to keep constant in single measurement process

[0005] (2) The existing technology can only characterize the fast-axis switching angle of FLC, and it is difficult to simultaneously detect parameters such as optical rotation angle, retardation, and fast-axis azimuth angles of the two states

[0006] (3) Existing detection technology usually can only give the optical characteristic parameters of the wave plate or LCVR at a certain wavelength point in a single measurement, and it is difficult to give the spectral parameters in a single measurement

[0007] (4) Existing high-precision detection technology usually includes Mueller matrix measurement, which will lead to high cost of detection device

[0008] (5) Some technologies have strict requirements on the location of the detection object. During the detection process, due to the inaccurate installation position of the detection object, the detection accuracy is greatly reduced

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