Liquid crystal polarization grating cascade device and diffraction angle regulation and control method thereof

A liquid crystal polarization grating, diffraction angle technology, applied in instruments, optics, nonlinear optics, etc., can solve the problems of low diffraction efficiency and small deflection angle

Active Publication Date: 2020-03-27
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

Solve the current problems of low diffraction efficiency and small deflection angle

Method used

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  • Liquid crystal polarization grating cascade device and diffraction angle regulation and control method thereof
  • Liquid crystal polarization grating cascade device and diffraction angle regulation and control method thereof
  • Liquid crystal polarization grating cascade device and diffraction angle regulation and control method thereof

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Embodiment Construction

[0035] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Depend on figure 1 It can be seen that the liquid crystal polarization grating has a two-dimensional periodic structure, where:

[0037] In the x-z plane (horizontal plane), the angle α between the optical axis of the liquid crystal molecular layer of the liquid crystal polarization grating and the z-axis will periodically change along the x direction (ie, the horizontal direction), and its period length is recorded as Λ x .

[0038] On the y-z plane, the liquid crystal molecular layer (or more generally, the birefringence material molecular layer) of the liquid crystal polarization grating presents a periodic spiral structure in the y direction (that is, the vertical direction), and its period is recorded as Λ y .

[0039] Such a two-dimensional periodic structure can produce a series of inclined periodic ...

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Abstract

The invention discloses a liquid crystal polarization grating cascade device and a diffraction angle regulation and control method thereof. The device sequentially comprises a twisted nematic liquid crystal box, a broadband quarter-wave plate and a liquid crystal polarization grating from left to right, wherein the twisted nematic liquid crystal box and the broadband quarter-wave plate are combined to form a polarization converter which is used for realizing the polarization conversion of the incident light and completing the diffraction angle regulation of the liquid crystal polarization grating. Furthermore, a liquid crystal polarization grating film cascade device includes N basic units, N is greater than or equal to 1, and the basic units are vertically and parallelly arranged. An airlayer exists in the cascade connection of the basic units, the basic units sequentially comprise a polarization converter, a first liquid crystal polarization grating and a second liquid crystal polarization grating from left to right, the incident light passes through the first basic unit and then is subjected to the first-level diffraction, and a diffraction light beam of the previous basic unitbecomes an incident light beam of the next basic unit to diffract continuously, so that 2N diffraction angles are regulated and controlled.

Description

technical field [0001] The invention relates to a non-mechanical light beam deflection technology, in particular to a liquid crystal polarization grating cascaded device and a method for regulating its diffraction angle, which can be applied to laser space communication, laser radar, laser guidance and the like. Background technique [0002] Non-mechanical beam scanning is a technology to precisely control the direction of laser beams. It has the advantages of small size, fast speed and easy control. It has broad application prospects in aerospace, new system laser radar, space optical communication and other fields. [0003] Liquid crystal polarization grating is an ultra-thin diffractive optical element, which significantly reduces size, weight and offset angle compared with other diffractive elements. However, traditional liquid crystal gratings face problems such as too small deflection angle, low diffraction efficiency, and slow response speed. Therefore, it is very ne...

Claims

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Application Information

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IPC IPC(8): G02F1/29G02F1/13363
CPCG02F1/292G02F1/13363G02F1/133638Y02A90/10
Inventor 张宇宁顾雨晨翁一士崔静怡
Owner SOUTHEAST UNIV
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