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Photo-control liquid crystal spatial light modulator and application thereof

A technology of spatial light modulator and liquid crystal, which is applied in the fields of instruments, optics, nonlinear optics, etc., can solve the problems of commercial spatial light modulators such as high price, reduced beam quality and efficiency, and serious stray light, so as to save production cost, Less stray light and better beam quality

Inactive Publication Date: 2017-07-04
南京晶萃光学科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large size of each pixel, complex optical path systems such as beam expansion and beam reduction are required for general lasers; the existence of back electrodes causes serious stray light, which greatly reduces the quality and efficiency of the generated beam; at the same time, structured electrodes make commercial space Optical modulators are expensive and inconvenient to operate

Method used

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  • Photo-control liquid crystal spatial light modulator and application thereof
  • Photo-control liquid crystal spatial light modulator and application thereof
  • Photo-control liquid crystal spatial light modulator and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The optically controlled liquid crystal spatial light modulator realizes the optically controlled orientation of liquid crystal selection.

[0048] Cut the ITO glass to a suitable size, dry it after ultrasonic cleaning, and perform UVO cleaning to increase the wettability and adhesion between the surface and the photo-alignment material. The azo-based photo-alignment material SD1 was spin-coated on the substrate, and dried on a hot stage to form a film.

[0049] Expose through a polarizer with a blue 405nm LED (5J / cm 2 ), a uniform initial orientation is obtained on both sheets.

[0050] Then, place one of the substrates on the focal plane of the DMD exposure system. Select the pattern that needs to be exposed, output it to the DMD surface with a computer, and adjust the polarization direction of the polarizer to be perpendicular to the original exposure direction, and expose again (5J / cm 2 ). The orientation direction of the double exposed areas will be perpendicul...

Embodiment 2

[0054] The generation and detection of liquid crystal Airy templates and Airy beams are formed by using optically controlled liquid crystal spatial light modulators.

[0055] The previous exposure steps are the same as in Example 1, the difference is that the two pieces of glass sheets exposed for the first time are glued into a box, and then taken to the DMD system for secondary exposure of the Airy template pattern, such as Figure 5 (a) shown. The direction of the secondary exposure is perpendicular to the direction of the primary exposure. The method of making the box and filling the liquid crystal is the same as that of Embodiment 1. Under this method, the liquid crystal molecules in the re-exposed area and the non-re-exposed area in the liquid crystal cell are in parallel PA orientation, but the two orientations are orthogonal to each other. The advantage of this arrangement of liquid crystal molecules is that the diffraction spots and diffraction efficiency produced b...

Embodiment 3

[0057] In this embodiment, a one-dimensional polarization grating is formed by using an optically controlled liquid crystal spatial light modulator.

[0058] In this embodiment, two ITO glass sheets that were spin-coated with a photoalignment agent and formed into a film were first prepared into a box, and the empty box was placed in a DMD dynamic micro-exposure system for exposure. Since the orientation of the liquid crystal of the polarization grating is distributed periodically and continuously and gradually, and the orientation of the cell is consistent from top to bottom, such as Figure 6 As shown in (a), the liquid crystal orientation changes from zero to 180°. Segment the director simulation map, and only expose a part of the area each time. The next exposure area is the position after the previous exposure has been shifted by a certain distance. The two exposure areas overlap, and the total dose of multiple exposures is enough to make The photoalignment agent reaches...

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Abstract

The invention discloses a photo-control liquid crystal spatial light modulator comprising a light source assembly, a dynamic mask generation assembly, a graphic microfilming assembly and an objective table; the light source assembly is used for generating a collimated light beam; the dynamic mask generation assembly is used for performing micro-area modulation on incident light, and comprises a DMD serving as a reflection-type dynamic mask and a control system used for masking graphic input; the graphic microfilming assembly is used for microimaging reflected light output from the dynamic mask generation assembly on a substrate on the objective table, and comprises a convergent lens, and adjustable microscopic objective and a polaroid; and the photo-alignment material is erasable azo dye SD1. An application method of the photo-control liquid crystal spatial light modulator is also disclosed. Through the photo-control liquid crystal spatial light modulator, functions, such as light beam shaping and control, of a traditional spatial light modulator are fulfilled, elements, such as polarization and diffraction, can also be generated, and the photo-control liquid crystal spatial light modulator can be applied to the fields of wave-front correction, light beam control, photo-communication and quantum optics and the like.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal orientation control, in particular to a liquid crystal spatial light modulator and its application. Background technique [0002] Liquid crystals are widely used in information display, optical and photonic devices and other fields. High-quality liquid crystal orientation control is a prerequisite for all applications of nematic liquid crystals. Photo-controlled alignment is a newly developed non-contact liquid crystal alignment method. It utilizes photosensitive materials to undergo directional photocrosslinking, isomerization or photocleavage reactions under ultraviolet polarized light irradiation to achieve alignment. It overcomes the above shortcomings and has important application prospects. The preparation of liquid crystal devices by optical control alignment technology can realize phase modulation, polarization modulation, amplitude control, etc., which is suitable for the prepara...

Claims

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Application Information

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IPC IPC(8): G02F1/13G02F1/1337
CPCG02F1/1313G02F1/133788
Inventor 葛士军程志华
Owner 南京晶萃光学科技有限公司
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