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Optical Engineering • Open Access

Method for holographic femtosecond laser parallel processing using digital blazed grating and the divergent spherical wave
Author(s): Chaowei Wang; Yahui Su; Jinli Wang; Chenchu Zhang; Ziyu Zhang; Jiawen Li

Paper Abstract

A method for holographic femtosecond laser parallel processing is proposed, which can suppress the interference of zero-order light effectively and improve the energy utilization rate. In order to blaze the target pattern to the peak position of zero-order interference, a phase-only hologram containing a digital blazed grating is designed and generated, and the energy of the target pattern can be increased by 3.793 times in theory. In addition, by subsequently increasing the phase of the divergent spherical wave, the focal plane of the target pattern and the plane of the multiorder diffraction beam resulting from the pixelated structure of the spatial light modulator (SLM) can be separated. Both a high-pass filter and aperture are used to simultaneously eliminate the influences of zero-order light and multiorder interferential patterns. A system based on the phase-only SLM (with resolution of 1920×1080) is set up to validate the proposed method. The experimental results indicate that the proposed method can achieve high-quality holographic femtosecond laser parallel processing with a significantly improved energy utilization rate.

Paper Details

Date Published: 27 January 2015
PDF: 6 pages
Opt. Eng. 54(1) 016109 doi: 10.1117/1.OE.54.1.016109
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Chaowei Wang, Anhui Univ. (China)
Yahui Su, Anhui Univ. (China)
Jinli Wang, Anhui Univ. (China)
Chenchu Zhang, Univ. of Science and Technology of China (China)
Ziyu Zhang, Anhui Univ. (China)
Jiawen Li, Univ. of Science and Technology of China (China)

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