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Waveguide type liquid crystal-based laser scanning control method

A technology of laser scanning and control method, applied in the fields of microelectronics and optics, to achieve the effect of reducing the amount of calculation, reducing the response time, and simplifying the calculation

Pending Publication Date: 2020-02-07
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to quickly realize fast and precise control of the scanning angle and large-angle scanning in liquid crystal laser scanning devices has always been a problem that plagues the industry.
However, the waveguide type (VA) liquid crystal has the characteristic of discontinuous transformation of the electrically controlled refractive index. How to realize the rapid and precise control of the laser scanning angle of the waveguide type liquid crystal and realize the large-angle scanning is an unsolved problem in the prior art.

Method used

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  • Waveguide type liquid crystal-based laser scanning control method
  • Waveguide type liquid crystal-based laser scanning control method
  • Waveguide type liquid crystal-based laser scanning control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1:

[0051] Such as figure 1 , This is an enlarged view of the laser angle control unit. Take the isosceles triangle laser angle control unit with an apex angle of 120° as an example. The laser angle control unit is set as a waveguide liquid crystal with a refractive index of n 2 , The refractive index setting of other non-working area S n 1 , When a voltage is applied to the laser angle control part, due to the characteristics of the waveguide liquid crystal, the refractive index becomes larger, n 2 > n 1 , So the incident light can be deflected by 3°. The bottom side length of the controller is set to 10μm. Of course, in other embodiments, the top angle and bottom side length can be adaptively changed to achieve the same technical effect, or other areas can be directly powered on to achieve negative Voltage light angle control.

[0052] Such as figure 2 The laser angle control unit is used to form a laser scanning control structure based on waveguide liquid crysta...

Embodiment 2

[0056] Such as figure 2 In the second embodiment, on the basis of the first embodiment, the upper and lower deflection electrodes are arranged symmetrically along the incident direction of the light. In this way, it is easier to calculate the angle after the deflection, and the angle after the deflection is easier to calculate. In example 2, the light angle control part of each electrode is set to the same isosceles triangle or isosceles trapezoid, as in figure 2 It is set to a light angle control structure that can deflect the light by 3°, so that each light deflection is set to the same angle, that is, the same electrodes are cascaded, which is very easy to calculate. Because the waveguide type liquid crystal receives the electrode signal, There is a non-linear refractive index change, so for the waveguide type liquid crystal, if the angle is set to the same angle, the angle change and period can be calculated relatively easily.

Embodiment 3

[0058] In Embodiment 3, different electrodes can also be set to different angles of deflection. For example, a large-angle deflection is the main method and a small-angle deflection is a supplementary method. For example, the front deflection angle is set to 5° deflection, and the small electrode at the back It is set to 3° deflection, and the deflection angle at the extreme edge is set to 2° or 1° deflection. Of course, different angles can also be used in other embodiments. In this way, it is better than setting the deflection of each light to the same angle. This can be calculated The angle of the pseudo-deflection can be further adjusted by choosing different electrodes, but this is more computationally expensive.

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Abstract

The invention discloses a laser scanning control method for waveguide type liquid crystals. The method comprises the following steps of (1) arranging an electrode driving layer above a liquid crystallayer and arranging a plurality of independently controlled electrodes on the electrode driving layer, wherein one end of each electrode is provided with a laser angle control part and each laser angle control part comprises an incoming edge and an outgoing edge to ensure that both the incoming edge and the outgoing edge are straight edges and are mutually intersected or extension cords of the incoming edge and the outgoing edge are intersected; (2) respectively arranging the plurality of independently controlled electrodes as a zero-level electrode, a first-level electrode, ..., an N-level electrode along the laser incidence direction; (3) selecting the zero-level to the N-level deflection electrodes to apply positive or negative voltage according to a to-be-deflected angle; and (4) removing the positive or negative voltage when the liquid crystal level under the N-level deflection electrode achieves full deflection. The method is capable of calculating the voltage application manneron the electrodes in advance according to the characteristics of the waveguide type liquid crystals, so as to rapidly realize the continuous laser scanning of the waveguide type liquid crystals.

Description

Technical field [0001] The present invention relates to the field of microelectronics and optics, in particular to a laser scanning control method based on waveguide type liquid crystal. Background technique [0002] In the liquid crystal laser scanning device, usually a mode is mainly transmitted in the light guide layer film, part of the light field propagates in the liquid crystal layer, and is controlled by the boundary liquid crystal molecules, so this type of device usually has a short response time ( About 100us), faster scanning frequency (about 100kHz). However, how to quickly achieve rapid and precise control of the scanning angle and large-angle scanning in the liquid crystal laser scanning device has always been a problem in the industry. However, the waveguide type (VA) liquid crystal has the characteristic of electronically controlled discontinuous refractive index conversion. How to realize the rapid and precise control of the laser scanning angle of the waveguide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/295
CPCG02F1/295
Inventor 娄飞邱成峰刘红均孙小卫程鑫刘召军庹勇
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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