Title:
DIFFRACTIVE OPTICAL ELEMENT AND PREPARATION METHOD THEREFOR, AND METHOD FOR DESIGNING MASTER DIFFRACTION PATTERN
Document Type and Number:
WIPO Patent Application WO/2023/097850
Kind Code:
A1
Abstract:
A diffractive optical element (100) and a preparation method therefor, and a method for designing a master diffraction pattern, which relate to the technical field of diffractive optics. The preparation method comprises: providing a transparent substrate (101); forming, by means of a first master, a first grating structure layer (110) on a side surface of the transparent substrate (101); and forming, by means of a second master, a second grating structure layer (120) on the transparent substrate (101) on which the first grating structure layer (110) is formed, wherein a first preset diffraction pattern on the first master is different from a second preset diffraction pattern on the second master, and at least one of the first grating structure layer (110) and the second grating structure layer (120) is a one-dimensional grating structure layer. A dot matrix generated by the first grating structure layer (110) and a dot matrix generated by the second grating structure layer (120) are combined to form a preset array dot matrix. By using two grating structure layers, dot matrices obtained after decomposition are characterized in that the number of same is less, the shape of the dot matrices is regular, etc., thereby greatly reducing the design and processing difficulty of the diffractive optical element (100), high-performance split light beams are obtained, and a better beam splitting uniformity of a two-dimensional dot matrix is maintained.
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Inventors:
WANG LINGYI (CN)
WU WEIMING (CN)
LIU FENGLEI (CN)
WU WEIMING (CN)
LIU FENGLEI (CN)
Application Number:
PCT/CN2021/142666
Publication Date:
June 08, 2023
Filing Date:
December 29, 2021
Export Citation:
Assignee:
ZHEJIANG CRYSTAL OPTECH CO LTD (CN)
International Classes:
G02B27/00; G02B5/18
Foreign References:
| CN109283730A | 2019-01-29 | |||
| CN111812773A | 2020-10-23 | |||
| CN109814256A | 2019-05-28 | |||
| CN111781733A | 2020-10-16 | |||
| CN106933027A | 2017-07-07 | |||
| JP2004078166A | 2004-03-11 |
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
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