Method for holographic femtosecond laser parallel processing using digital blazed grating and the divergent spherical wave

Chaowei Wang; Yahui Su; Jinli Wang; Chenchu Zhang; Ziyu Zhang; Jiawen Li

doi:10.1117/1.OE.54.1.016109

27 January 2015 Method for holographic femtosecond laser parallel processing using digital blazed grating and the divergent spherical wave

Chaowei Wang, Yahui Su, Jinli Wang, Chenchu Zhang, Ziyu Zhang, Jiawen Li

Author Affiliations +

Optical Engineering, Vol. 54, Issue 1, 016109 (January 2015). https://doi.org/10.1117/1.OE.54.1.016109

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.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Chaowei Wang, Yahui Su, Jinli Wang, Chenchu Zhang, Ziyu Zhang, and Jiawen Li "Method for holographic femtosecond laser parallel processing using digital blazed grating and the divergent spherical wave," Optical Engineering 54(1), 016109 (27 January 2015). https://doi.org/10.1117/1.OE.54.1.016109

Published: 27 January 2015

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