US 12,265,215 B2
Diffractive optical element for beam splitting and design method therefor, and structured light projector
Peng Chen, Zhejiang (CN); Zhentao Fan, Zhejiang (CN); Muyun Wang, Zhejiang (CN); Lixin Wei, Zhejiang (CN); and Lei Sui, Zhejiang (CN)
Assigned to JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD., Zhejiang (CN)
Appl. No. 18/725,508
Filed by JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD., Zhejiang (CN)
PCT Filed Nov. 24, 2022, PCT No. PCT/CN2022/134006
§ 371(c)(1), (2) Date Jun. 28, 2024,
PCT Pub. No. WO2023/124667, PCT Pub. Date Jul. 6, 2023.
Claims priority of application No. 202111663225.1 (CN), filed on Dec. 31, 2021.
Prior Publication US 2025/0067975 A1, Feb. 27, 2025
Int. Cl. G02B 27/00 (2006.01); G02B 27/10 (2006.01); G03B 21/20 (2006.01)
CPC G02B 27/0012 (2013.01) [G02B 27/1086 (2013.01); G03B 21/2033 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A design method for a diffractive optical element for beam splitting, comprising:
S11: determining an input light field distribution and a target output light field distribution of the diffractive optical element, the input light field distribution comprising a parameter and arrangement of a light source, and the target output light field being a speckle array with uniform light splitting or an energy distribution distributed regularly from a center to an edge;
S12: constructing a light-splitting point array of the diffractive optical element, the light-splitting point array being used to perform array replication on the light source to obtain multiple blocks in a speckle array within a specific field of view, and an arrangement of the light-splitting point array being a regular arrangement or a longitudinal and/or transverse periodic misalignment arrangement;
S13: disturbing the light-splitting point array to reduce a deviation between an actual output light field and the target output light field caused by a vector effect, and limiting an amount of disturbance of a disturbing method to ensure that there is no obvious overlap or gap between adjacent blocks in the speckle array; and
S14: designing the diffractive optical element by using a scalar GS algorithm according to the disturbed light-splitting point array;
wherein the disturbing comprises moving at least some of points in the light-splitting point array.