1 June 2011 Radially polarized laser beam generation by reflecting volume phase grating with high converting efficiency
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Abstract
A simple setup for radially polarized beam generation based on the reflecting volume phase grating is proposed to enhance the converting efficiency. The radially polarized beam is obtained by coherently combining the two orthogonally polarized Hermite-Gaussian HG01 and HG10 beams. By using the plane wave decomposition and the three-dimensional rigorous coupled wave analysis approaches, the intensity distribution of the diffracted beam is compared with the respective incident beam. The intensity and the polarization angle divergence of the combined beam are analyzed. The results show that the intensity profile of the diffracted beam is not changed remarkably compared to that of the input beam. The radially polarized beam can be obtained with a converting efficiency of 99.93% and the degree of radial polarization approaches a unit at a given polarization angle divergence value of 1 deg when the central alignment divergence is smaller than 0.025 mm.
© (2011) Society of Photo-Optical Instrumentation Engineers (SPIE)
Benjian Shen, Jichun Tan, Guangwei Zheng, "Radially polarized laser beam generation by reflecting volume phase grating with high converting efficiency," Optical Engineering 50(6), 064201 (1 June 2011). https://doi.org/10.1117/1.3584842 . Submission:
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