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Fast quasi-static beam steering via conformally-mapped gratings
Author(s): Liang Wu; William Maxwell Mellette; Glenn M. Schuster; Joseph E. Ford
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Paper Abstract

Fast beam steering is useful in applications including free space optical switching and communications. Quasi-static beam steering, where the beam rapidly switches between discrete fixed directions, presents special challenges. Here we demonstrate a fast quasi-static ‘pinwheel’ scanner by conformally mapping linear blazed gratings into curved structures fabricated onto annular sections of a rotary disk. We use Matlab and Zemax to model the effects of the conformallymapped grating on the emitted optical beam. We show a specific two-dimensional (2D) ‘pinwheel’ scanner design with 56 gratings, each deflecting 1.31 μm incident light by 11.3° in one of four directions with 75% optical efficiency. The element was fabricated by optical grey-scale lithography on a 95 mm diameter substrate, coated with gold, and mounted onto the spindle of a 3.5” format 7200 rpm magnetic disk drive. We characterize the optical beam steering efficiency, pointing, and stability, and demonstrate microsecond switching speed of a single mode fiber signal.

Paper Details

Date Published: 6 September 2019
PDF: 10 pages
Proc. SPIE 11136, Optics and Photonics for Information Processing XIII, 111360W (6 September 2019); doi: 10.1117/12.2529460
Show Author Affiliations
Liang Wu, Univ. of Electronic Science and Technology of China (China)
Univ. of California, San Diego (United States)
William Maxwell Mellette, Univ. of California, San Diego (United States)
Glenn M. Schuster, Univ. of California, San Diego (United States)
Joseph E. Ford, Univ. of California, San Diego (United States)


Published in SPIE Proceedings Vol. 11136:
Optics and Photonics for Information Processing XIII
Khan M. Iftekharuddin; Abdul A. S. Awwal; Victor H. Diaz-Ramirez; Andrés Márquez, Editor(s)

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