Abstract
A hybrid circular subwavelength grating mirror is proposed and fabricated as a rear mirror in a fast axial flow laser system to generate azimuthally polarized beams (APBs). This grating mirror, with particular gold-covered ridges and nanopillar-stuffed grooves, performs wideband TE wave reflectivity and high polarization selectivity. It shows that the polarization selectivity mechanism lies in the gold ridge’s high reflectivity to the TE wave and the lower TM wave reflectivity, which are the result of the mode leaking into substrate through the dielectric-like nanopillar layer. Finally, a high-quality 550 W APB is obtained in subsequent experiments, which provides potential applications in drilling and welding.
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
Bo Li, Youyou Hu, Yi Hu, and Jiang Zhao
Appl. Opt. 56(12) 3383-3385 (2017)
Chunlin Zhu, Qingbin Jiao, Xin Tan, Wei Wang, and Bayanheshig
Appl. Opt. 58(15) 4052-4058 (2019)
Tobias Moser, Jürg Balmer, Danaë Delbeke, Peter Muys, Steven Verstuyft, and Roel Baets
Appl. Opt. 45(33) 8517-8522 (2006)