Composite liquid crystal device for light beam deflection

Abstract

The invention discloses a composite liquid crystal device for light beam deflection. The composite liquid crystal device for light beam deflection comprises a liquid crystal box of an adjustable liquid crystal half-wave plate, a dielectric film and a liquid crystal polarized grating, wherein the liquid crystal box is used for controlling the rotation direction of an incident circular polarized light through electronic control switching; the liquid crystal polarized grating is used for deflecting the circular polarized light passing through the liquid crystal box; the liquid crystal box and theliquid crystal polarized grating share one glass substrate; the dielectric film is coated on the surface of the liquid crystal box; the liquid crystal polarized grating is attached onto the dielectric film; the dielectric film is used for transmitting the working wavelength of the composite liquid crystal device and reflecting the photo-orientation exposure wavelength. The composite liquid crystal device provided by the invention is compact in structure, small in thickness, beneficial to improving the optical loss characteristic of overall light beam deflection, and capable of preventing a photo-orientation structure in the liquid crystal box of the adjustable liquid crystal half-wave plate from being erased for the second time during the manufacturing process.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a composite liquid crystal device used for light beam deflection. Background technique [0002] As a new type of beam deflection control device, liquid crystal polarization grating has excellent characteristics such as large deflection angle, high diffraction efficiency, small size, light weight, low power consumption, and multi-chip cascade for electronically controlled scanning. It has important application value in the fields of photoelectric imaging and detection, target tracking and aiming, laser sensing and space communication. [0003] When the current liquid crystal polarization grating is used for beam deflection, a multi-piece liquid crystal polarization grating is generally stacked to realize electronically controlled scanning at multiple angles. As the number of deflection angles Q increases, the number N of liquid crystal polarization grating stacks also increases, an...

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Problems solved by technology

[0004] When the light beam passes through the liquid crystal polarization grating device, loss will occur, especially when the number N of liquid crystal polarization grating stacks is large, the optical loss caused by stacking multiple liquid crystal polarization gratings cannot be ignored, and the overall thickness of the device also becomes a Issues that need to be considered, these issues have become important factors that restrict the further increase of the number of beam deflection angles, and need to be resolved

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