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Proceedings Paper

Beam steering by combining two binary-phase-modulated FLC SLMs
Author(s): David Engstrom; Sverker Hard; Per Rudquist; Koen D'have; Tomasz Matuszczyk; Marek Skeren; Bjorn Lofving
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Paper Abstract

Ferroelectric Liquid Crystal (FLC) Spatial Light Modulators (SLMs) are attractive because of their high switching speed. However, conventional FLC SLMs are only capable of binary phase modulation. This is inconvenient for beam steering since as much as 60% of the incident power is lost to unwanted diffraction orders. To overcome this problem two cascaded FLC SLMs were used in this work. By coherently imaging a 180° binary-phase FLC SLM onto a 90° FLC SLM, with high precision, an effective four-level phase modulator was realized experimentally. Beam steering was demonstrated in the angular range ±10.9 mrad. The angular inaccuracy of the steered beam was found to be about 0.1 mrad, which equals about 25% of the beam diameter. The beam steering device has also been used for tracking experiments.

Paper Details

Date Published: 10 November 2003
PDF: 12 pages
Proc. SPIE 5181, Wave Optics and Photonic Devices for Optical Information Processing II, (10 November 2003); doi: 10.1117/12.502379
Show Author Affiliations
David Engstrom, Chalmers Univ. of Technology (Sweden)
Sverker Hard, Chalmers Univ. of Technology (Sweden)
Per Rudquist, Chalmers Univ. of Technology (Sweden)
Koen D'have, Chalmers Univ. of Technology (Sweden)
Tomasz Matuszczyk, FLC Electronics AB (Sweden)
Marek Skeren, Czech Technical Univ. in Prague (Czech Republic)
Bjorn Lofving, Imego AB (Sweden)

Published in SPIE Proceedings Vol. 5181:
Wave Optics and Photonic Devices for Optical Information Processing II
Pierre Ambs; Fred R. Beyette Jr., Editor(s)

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