Dynamic laser beam shaping for material processing using hybrid holograms

Liu, Dun, Yang, Yutao, Zhai, Zhongsheng, Fang, Zheng, Tao, Qing, Perrie, walter, Edwardson, SP ORCID: 0000-0001-5239-4409 and Dearden, geoffrey ORCID: 0000-0003-0648-7473 (2018) Dynamic laser beam shaping for material processing using hybrid holograms. Optics & Laser Technology, 102. pp. 68-73.

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Abstract

A high quality, dynamic laser beam shaping method is demonstrated by displaying a series of hybrid holograms onto a spatial light modulator (SLM), while each one of the holograms consists of a binary grating and a geometric mask. A diffraction effect around the shaped beam has been significantly reduced. Beam profiles of arbitrary shape, such as square, ring, triangle, pentagon and hexagon, can be conveniently obtained by loading the corresponding holograms on the SLM. The shaped beam can be reconstructed in the range of 0.5 mm at the image plane. Ablation on a polished stainless steel sample at the image plane are consistent with the beam shape at the diffraction near-field. The ±1st order and higher order beams can be completely removed when the grating period is smaller than 160 μm. The local energy ratio of the shaped beam observed by the CCD camera is up to 77.67%. Dynamic processing at 25 Hz using different shapes has also been achieved.

Item Type:	Article
Uncontrolled Keywords:	beam shaping, binary grating, geometric mask, spatial light modulator
Depositing User:	Symplectic Admin
Date Deposited:	18 Jan 2018 16:49
Last Modified:	19 Jan 2023 06:43
DOI:	10.1016/j.optlastec.2017.12.022
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3016387