A liquid crystal polarization grating cascade device and its diffraction angle control method

A technology of liquid crystal polarization grating and diffraction angle, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of small deflection angle and low diffraction efficiency, and achieve the effect of small viscosity coefficient

Active Publication Date: 2022-07-12
SOUTHEAST UNIV
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Problems solved by technology

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

Method used

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  • A liquid crystal polarization grating cascade device and its diffraction angle control method
  • A liquid crystal polarization grating cascade device and its diffraction angle control method
  • A liquid crystal polarization grating cascade device and its diffraction angle control method

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below with reference to 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 change periodically along the x direction (that is, the horizontal direction), and the period length is denoted as Λ x .

[0038] On the y-z plane, the liquid crystal molecular layer (or more generally, the molecular layer of birefringent material) of the liquid crystal polarization grating exhibits a periodic helical structure in the y direction (ie, the vertical direction), and its period is denoted as Λ y .

[0039] Such a two-dimensional periodic structure can generate a series of tilted refractive...

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Abstract

The invention discloses a liquid crystal polarization grating cascade device and a diffraction angle control method thereof. The device includes a twisted nematic liquid crystal cell, a broadband quarter-wave plate and a liquid crystal polarization grating in sequence from left to right, wherein the twisted nematic liquid crystal The cell and the broadband quarter-wave plate are combined into a polarization converter, which is used to realize the polarization conversion of the incident light and complete the diffraction angle control of the liquid crystal polarization grating. In addition, a liquid crystal polarization grating thin film cascade device includes N basic units, N≥1, the basic units are arranged vertically and parallel, and an air layer exists between the cascades of the basic units, and the basic units sequentially include from left to right For the polarization converter, the first liquid crystal polarization grating and the second liquid crystal polarization grating, the incident light will undergo first-order diffraction after passing through the first basic unit, and the diffracted beam of the former basic unit will become the incident beam of the latter basic unit, and will continue to diffract , to achieve 2 N A diffraction angle control.

Description

technical field [0001] The invention relates to a non-mechanical beam deflection technology, in particular to a liquid crystal polarization grating cascade device and a diffraction angle control method thereof, 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 that realizes precise control of the direction of laser beams. It has the advantages of small size, fast speed and easy control. It has a wide range of application prospects in aerospace, new system lidar, space optical communication and other fields. [0003] Liquid crystal polarization gratings are ultra-thin diffractive optical elements that significantly reduce size, weight and offset angle compared to 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 n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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