Flattop Beam Shaping Using Hybrid Gratings

A new method of laser beam shaping with hybrid gratings is presented. The hybrid gratings consist of a blazed grating and a gradient binary grating. The blazed grating is used to separate the incident Gaussian beam into zero order and nonzero diffraction orders. A filter is used to block the nonzero...

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Bibliographic Details
Published in:IEEE photonics journal 2022-08, Vol.14 (4), p.1-5
Main Authors: Zhai, Zhongsheng, Gao, Tian, Zhang, Yi, Lv, Qinghua, Wang, Xuanze, Xie, Boya
Format: Article
Language:English
Subjects:
Diffraction
Diffraction gratings
Energy distribution
Gaussian beams (optics)
gradient binary grating
Gratings
Laser beam shaping
Laser beams
Licenses
Light modulation
Nonuniformity
Phase modulation
Shape
Slopes
spatial light modulation
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Summary:A new method of laser beam shaping with hybrid gratings is presented. The hybrid gratings consist of a blazed grating and a gradient binary grating. The blazed grating is used to separate the incident Gaussian beam into zero order and nonzero diffraction orders. A filter is used to block the nonzero order beams and obtain the zero orders with the desired shape. The gradient binary grating is used to improve the energy distribution of the inside area of the geometric shape. A phase hologram designed with the desired shape and hybrid gratings, is loaded on a phase-only spatial light modulation to achieve arbitrary geometric flattop shapes with high uniformity. Squared and hexagonal shaping experiments demonstrated that the presented method can convert a Gaussian beam into a flattop beam with steepness edge and high uniformity. Experimental results show that the beam non-uniformity is less than 0.037.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2022.3186902