A preparation method of a grating with continuously changing diffraction efficiency

A diffraction efficiency and grating technology, applied in the field of waveguide optical diffraction elements, can solve problems such as poor uniformity of the outgoing beam

Active Publication Date: 2021-05-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a grating with continuously changing diffraction efficiency, which can solve the disadvantage of poor uniformity of the outgoing beam of the optical system based on the waveguide grating coupler, and the preparation method is simple

Method used

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  • A preparation method of a grating with continuously changing diffraction efficiency
  • A preparation method of a grating with continuously changing diffraction efficiency
  • A preparation method of a grating with continuously changing diffraction efficiency

Examples

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Embodiment 1

[0039] Such as figure 1 and Figure 7 As shown, after the light with a wavelength a is emitted from the laser 1, two beams of light are separated by the beam splitter 3, and the two beams of light are respectively reflected by the mirror 4 to form a certain angle, and then pass through the beam expander lens 5, The filtering pinhole 6 and the collimating lens 7 interfere with each other after beam expansion, filtering and collimation.

[0040] After the light with wavelength b is emitted from the laser 2, after passing through the beam expander lens 5, the filter pinhole 6 and the collimator lens 7, after beam expansion, filtering and collimation, the light intensity of the obtained expanded beam is in a Gaussian distribution, In order to obtain a light beam with uniform distribution of light intensity, it should pass through the shaping lens 8 to make the light intensity uniform. The continuously variable transmittance neutral filter 13 can be superimposed on the uniformly ...

Embodiment 2

[0052] Such as Figure 4 and Figure 7 As shown, after the light with a wavelength a is emitted from the laser 1, two beams of light are separated by the beam splitter 3, and the two beams of light are respectively reflected by the mirror 4 to form a certain angle, and then pass through the beam expander lens 5, The filtering pinhole 6 and the collimating lens 7 interfere with each other after beam expansion, filtering and collimation.

[0053] After the light with wavelength b is emitted from the laser 2, after passing through the beam expander lens 5, the filter pinhole 6 and the collimator lens 7, after beam expansion, filtering and collimation, the light intensity of the obtained expanded beam is in a Gaussian distribution, In order to obtain a light beam with uniform distribution of light intensity, it should pass through the shaping lens 8 to make the light intensity uniform. The continuously variable transmittance neutral filter 13 can be superimposed on the uniformly...

Embodiment 3

[0071] Such as Figure 8 As shown, after the light with a wavelength a is emitted from the laser 1, it passes through the beam expander lens 5, the filter pinhole 6 and the collimator lens 7 for beam expansion, filtering and collimation, and then passes through the wedge-shaped plate 15, and then generates Equal thickness interference.

[0072] After the light with wavelength b is emitted from the laser 2, after passing through the beam expander lens 5, the filter pinhole 6 and the collimator lens 7, after beam expansion, filtering and collimation, the light intensity of the obtained expanded beam is in a Gaussian distribution, In order to obtain a light beam with uniform distribution of light intensity, it should pass through the shaping lens 8 to make the light intensity uniform. The continuously variable transmittance neutral filter 13 can be superimposed on the uniformly distributed light beam with wavelength b to obtain the light 12 with continuously changing light inten...

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Abstract

The invention discloses a preparation method of a grating with continuously changing diffraction efficiency: the first beam and the second beam of light with two spectral bands that do not overlap with each other are used, the first beam of light is interfered to form interference light, and the second beam of light Form light with continuous light intensity changes in space; irradiate the interference light and the light with continuous light intensity changes in space on the photosensitive material at the same time, and obtain a grating with continuous change in diffraction efficiency; The material is cured, and the light with continuous light intensity changes in space inhibits the curing of the photosensitive material; or the photosensitive material is a material whose refractive index changes due to light. The preparation method provided by the present invention is directly obtained by exposing the photosensitive material, mainly aiming at the disadvantage of poor uniformity of the outgoing beam of the existing optical system based on the waveguide grating coupler, and can obtain the outgoing beam with uniform light intensity distribution, thereby Effectively improve the imaging capability and information transmission capability of the optical system.

Description

technical field [0001] The invention relates to the field of waveguide optical diffraction elements, in particular to a preparation method of a grating with continuously changing diffraction efficiency. [0002] technical background [0003] A grating is a diffraction element whose optical parameters (such as transmittance, refractive index, etc.) or spatial structure distribution have periodic changes. The preparation of gratings is an important part of grating research. The selected optical materials include the following categories: glass material systems, semiconductor material systems, inorganic crystal material systems, organic material systems, etc. The preparation of gratings is researched around the process of these materials. Gratings can be divided into surface etched gratings and volume gratings. At present, surface-etched gratings modulate light beams through periodic spatial microstructures on the surface, which are mainly prepared by using photoresist grating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18G02B6/10
CPCG02B5/1814G02B5/1842G02B5/1857G02B6/10
Inventor 李海峰罗豪
Owner ZHEJIANG UNIV
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