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Photopolymer composition and grating

A technology of photopolymer and composition, applied in the field of holographic recording system of green-sensitive polymer, can solve the problems of damaged hologram, hologram fringe deformation, etc. the effect

Active Publication Date: 2022-04-29
LIGHTIN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Citation 2 discloses a photopolymer prepared by cationic ring-opening polymerization, but the maximum diffraction efficiency is only 75%
[0008] In addition, under normal circumstances, these recording materials need to be heat-treated after recording the hologram. The expansion and contraction of the photopolymer film during the treatment will cause the deformation of the hologram stripes and even damage the hologram.
[0009] It can be seen that although the photosensitive / photopolymer materials used in the holographic recording optical elements have been improved to a certain extent in the prior art, but for improving the overall performance of these materials, especially for the diffraction efficiency and refractive index modulation There is still room for further improvement in system and other performance improvements

Method used

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  • Photopolymer composition and grating
  • Photopolymer composition and grating
  • Photopolymer composition and grating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0211] A green sensitive holographic recording material is prepared according to the following steps:

[0212] 1) In a dark room or red light environment, mix the components in the following proportions to form a mixture, and heat up to 100°C and stir evenly;

[0213] 2) Maintain 100°C, apply the mixed solution obtained in step (1) on the glass substrate under red light, then cover another substrate on the surface, and obtain a solid photopolymer dry plate after cooling down to room temperature;

[0214] 3) Expose the dry plate obtained in step (2) with 532nm laser interference in a double-beam optical path (see attached figure 1 ), forming a holographic grating; using high laser intensity and short exposure time mode, the exposure energy density is 20mJ / cm 2 ;

[0215] 4) The holographic polymer grating obtained in step (3) can be completely fixed and bleached after being irradiated with natural light for about 30 minutes, and no post-processing is required.

[0216] The ...

Embodiment 2

[0222] 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:

[0223] Table 2

[0224] 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％

[0225] The reflective grating diffraction efficiency that present embodiment obtains is greater than 95% (see attached figure 2 ), the angular selectivity reaches ±12°, the exposure is sensitive, and the refractive index modulation reaches 0.08.

Embodiment 3

[0227] Same as embodiment 1 method, but the photopolymer dry film component content of gained is as shown in table 3 below:

[0228] table 3

[0229] composition content Basic Red 2 0.2％ 4-Dimethylaminobenzoic acid ethyl ester 0.8％ Diphenyliodonium hexafluorophosphate 1％ 2-naphthyl acrylate (n=1.608) 39％ 9,9-bis(methylacrylate) fluorene (n=1.606) 13％ Cellulose acetate butyrate (n=1.475) 13％ Glutaric anhydride 7％ polyethylene glycol 26％

[0230] In this embodiment, polyethylene glycol is modified with glutaric anhydride and mixed with cellulose acetate butyrate, and the diffraction efficiency of the reflection grating obtained is greater than 85%.

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Abstract

The invention relates to a green-sensitive photopolymer composition and a grating. The composition includes the following components: a polymerization active monomer; a dye compound, which has excitation activity at least near the wavelength of 532nm light; agents; film-forming components and plasticizers. The refractive index difference (n 聚合活性单体 ‑n 成膜组分 ) value above 0.075. Compared with the existing holographic recording photopolymer materials, the grating obtained based on the composition of the present invention has higher refractive index modulation degree, exposure sensitivity and light transmittance, and has improved diffraction efficiency at the same time, and preferably With improved size shrinkage, in addition, the photosensitive material of the present invention has wider angle selectivity and is less affected by environmental humidity.

Description

technical field [0001] The invention belongs to the field of optical materials and their preparation, in particular to a photosensitive recording material and a grating formed therefrom, in particular to a photopolymer composition for green-sensitive holographic recording, a grating and a preparation method thereof or a green-sensitive polymerized The holographic recording system of objects. Background technique [0002] Holographic recording uses the principle of optical interference to record all information (including amplitude and phase) of the object light wave in the form of interference fringes. When the recording medium is thick (the thickness is much larger than the spacing of the recorded interference fringes), two coherent light beams interact in the medium to form a three-dimensional grating volume hologram. The absorption coefficient and refractive index of the volume hologram change periodically, and when the readout light satisfies the Bragg diffraction condi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03F7/004C09D4/06C09D4/02C09D7/41G03F7/027G02B5/18
CPCC09D4/06C09D7/41G03F7/027G03F7/004G02B5/1857
Inventor 陈淑丹魏一振张卓鹏
Owner LIGHTIN INC
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