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Diffractive optical element and optical device comprising the same

A diffractive optical element and diffractive optics technology, applied in the field of optical equipment, can solve problems such as difficulty in obtaining diffractive optical devices, difficult processing of diffractive structures, easy introduction of strong central zero-order light, etc.

Active Publication Date: 2020-10-27
ZHUHAI MULTISCALE PHOTOELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, limited by the processing level, it is difficult to process diffractive structures with small feature sizes, and it is difficult to obtain large-angle diffractive optical devices; in addition, since planar diffractive optical devices use collimated laser incident, if there is an error in the processing depth of the diffractive structure , it is very easy to introduce strong central zero-order light, which greatly limits the use of the device

Method used

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  • Diffractive optical element and optical device comprising the same
  • Diffractive optical element and optical device comprising the same
  • Diffractive optical element and optical device comprising the same

Examples

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Embodiment 1

[0037] see figure 1 , is a schematic structural diagram of the diffractive optical element provided in Embodiment 1.

[0038] In this embodiment, the diffractive optical element 100 is a spherical cap structure 13, the inner surface and / or outer surface of the spherical cap 13 is composed of a diffractive optical structure, and the light source beam 12 formed by the incident coherent light source 11 passes through the diffractive optical structure. After the structure, a large-angle diffraction pattern is formed.

[0039] In this embodiment, the radius of curvature of the spherical cap 13 is 1 cm, and the aperture is 5.2 mm.

[0040] see image 3 , is a schematic diagram of the diffractive optical structure of the outer surface of the spherical cap 13, the diffractive optical structure includes several continuous three-dimensional diffraction units (not shown), the angle of the diffraction pattern produced by the diffractive structure on the plane diffractive device is 60° ...

Embodiment 2

[0043] In this embodiment, the diffractive optical element 200 is a spherical cap structure 23, the inner surface and / or outer surface of the spherical cap 23 is composed of a diffractive optical structure, and the light source beam 22 formed by the incident coherent light source 21 passes through the diffractive optical After the structure, a large-angle diffraction pattern is formed.

[0044] In this embodiment, the radius of curvature of the spherical cap 23 is 5 cm, and the diameter is 3.42 mm.

[0045] see Figure 4 , is a schematic diagram of the diffractive optical structure of the outer surface of the spherical cap 23, the diffractive optical structure includes several continuous two-dimensional step-shaped diffractive units (not shown), the angle of the diffraction pattern produced by the diffractive structure on the plane diffractive device It is 50°*50°.

[0046] In the present embodiment, the coherent light source 21 is a semiconductor laser with a wavelength of ...

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Abstract

A diffractive optical element (100), being of a spherical crown (13) structure. The inner surface and / or the outer surface of the spherical crown (13) consist of a diffraction optical structure, so that large-angle diffraction is realized by means of the combined action of the spherical crown (13) structure and the diffraction optical structure, and the defect that the diffraction angle of a conventional planar optical device is limited by a characteristic size is overcome; by means of a macroscopic spherical crown (13) structure, normal tilt in different directions is provided for the diffraction structure, and the diffraction angle is increased.

Description

technical field [0001] The present invention relates to an optical device, in particular to a diffractive optical element and an optical device comprising the same diffractive optical element. Background technique [0002] Diffractive optical devices are widely used in beam shaping, beam splitting and generation of special optical patterns, and can be applied in the fields of structured light three-dimensional measurement, laser radar, optical communication and stage display. [0003] The current diffractive optical devices are mainly planar. The diffractive pattern is generated by marking the diffractive structure on the optical plane. The divergence angle of the diffractive pattern is determined by the characteristic size of the diffractive structure. bigger. [0004] However, limited by the processing level, it is very difficult to process diffractive structures with small feature sizes, and it is difficult to obtain diffractive optical devices with large angles; in addi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/42
CPCG02B27/42
Inventor 杜春雷夏良平
Owner ZHUHAI MULTISCALE PHOTOELECTRIC TECH CO LTD