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Optical waveguide element, preparation method thereof and holographic optical waveguide display equipment

A technology of optical waveguide and components, which is applied in the field of optics, can solve the problems of complex structure of holographic waveguide lens, small selectivity of grating diffraction angle, complex post-processing, etc., to achieve improved size shrinkage and diffraction efficiency, excellent optical waveguide imaging effect, The effect of simple production process

Active Publication Date: 2021-05-07
LIGHTIN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the holographic waveguide lens is complex, the manufacturing cost is high, complex post-processing is required, and the angular selectivity of grating diffraction is small
[0008] It can be seen that although the optical waveguide components have been improved to a certain extent in the prior art, there is still room for further improvement in terms of improving the overall performance of these materials

Method used

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  • Optical waveguide element, preparation method thereof and holographic optical waveguide display equipment
  • Optical waveguide element, preparation method thereof and holographic optical waveguide display equipment
  • Optical waveguide element, preparation method thereof and holographic optical waveguide display equipment

Examples

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preparation example Construction

[0190] A second aspect of the present invention provides a method for preparing the optical waveguide element of the first aspect, comprising the following steps:

[0191] The step of preparing photopolymer film 102;

[0192] The step of composite molding the carrier 101 and the photopolymer film 102;

[0193] The step of forming a grating structure, the photopolymer film 102 has at least one light-coupling region 103 and at least one light-coupling region 104, the light-coupling region 103 is not connected to the light-coupling region 104,

[0194] A grating structure is formed in the light coupling region 103 and the light coupling region 104 respectively.

[0195] The present invention is not particularly limited to the step of composite molding the carrier 101 and the photopolymer film 102 first and the step of forming the grating structure first, and may be the step of composite molding the carrier 101 and the photopolymer film 102 first, and then Forming the grating st...

Embodiment 1

[0228] An optical waveguide element is prepared according to the following steps:

[0229] 1) In a dark room or red light environment, mix 10mL of the polymer (obtained by heating at 100°C) and 2mg of silica microsphere spacers with an average particle size of 20μm to form a mixture, and raise the temperature Stir at 100°C for 4 hours until uniformly mixed;

[0230] 2) Maintain 100°C, apply the mixed solution obtained in step (1) on a 1mm thick glass substrate with a size of 20mm×70mm under red light, and then cover the upper surface of the mixed solution with another piece with a size of 20mm A 1mm thick glass substrate of ×70mm is cooled to room temperature to obtain a solid photopolymer dry plate;

[0231] 3) Interferentially expose one side of the dry plate obtained in step (2) after 532nm laser beam expansion and beam splitting (see attached Figure 5 ), the exposure area is 15mm×15mm, forming a volume holographic grating structure; the dry plate is exposed in the mode ...

Embodiment 2

[0239] The same method as in Example 1, but the exposure energy density is at 8mJ / cm 2 , and the resulting photopolymer dry film component content is shown in Table 2 below:

[0240] Table 2

[0241] composition content Basic Red 2 0.2％ N-phenylglycine 0.8％ 2-(4-Chlorophenyl)-4,5-diphenylimidazole 1％ 2-naphthylthioethyl acrylate (n=1.620) 33％ 9,9-bis(methylacrylate) fluorene (n=1.606) 11％ Cellulose acetate butyrate (n=1.475) 22％ N-vinylpyrrolidone 32％

[0242] The diffraction efficiency of the optical waveguide element obtained in this embodiment is greater than 95%, the angle selectivity reaches ±12°, the exposure is sensitive, and the refractive index modulation degree reaches 0.08.

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Abstract

The invention relates to an optical waveguide element, a preparation method thereof and holographic optical waveguide display equipment. The optical waveguide element comprises a laminated body formed by at least two carriers and a photopolymer film, wherein the photopolymer film is positioned between the at least two carriers; the photopolymer film is provided with at least one light coupling-in area and at least one light coupling-out area; the optical coupling-in area is not connected with the optical coupling-out area; and the positions of the optical coupling-in area and the optical coupling-out area are respectively provided with a grating structure. The optical waveguide element has high refractive index modulation degree, diffraction efficiency, sensitivity and light transmittance, and has an excellent optical waveguide imaging effect.

Description

technical field [0001] The invention belongs to the field of optical technology, specifically relates to the field of optical elements and their preparation, in particular to an optical waveguide element in the field of augmented reality and a preparation method thereof, or a holographic optical waveguide display device using the optical waveguide element. Background technique [0002] Near-eye display and head-mounted display technologies have been widely used in the field of augmented reality in recent years. The existing optical imaging schemes mainly include: coaxial prism, off-axis prism, coaxial curved surface and optical waveguide, among which optical waveguide is the focus of current research. The optical waveguide is to couple the light after optical mechanical imaging into the glass substrate, and transmit the light to the front of the eye through the principle of total reflection and then couple it out. In this process, the waveguide is only responsible for transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G02B6/13G03H1/02
CPCG02B6/122G02B6/1221G02B6/13G03H1/02G03H2001/0088
Inventor 雍海波陈淑丹魏一振张卓鹏
Owner LIGHTIN INC
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