High efficiency quasi-ternary design for nonmechanical beam-steering utilizing polarization gratings

Jihwan Kim; Matthew N. Miskiewicz; Steve Serati; Michael J. Escuti

doi:10.1117/12.860885

12 August 2010 High efficiency quasi-ternary design for nonmechanical beam-steering utilizing polarization gratings

Jihwan Kim, Matthew N. Miskiewicz, Steve Serati, Michael J. Escuti

Proceedings Volume 7816, Advanced Wavefront Control: Methods, Devices, and Applications VIII; 78160G (2010) https://doi.org/10.1117/12.860885
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

We introduce and demonstrate a quasi-ternary nonmechanical beam steering design based on Polarization Gratings (PGs). That uses a single wave plate and N PGs to generate 2(^N+1)-1 steering angles. When compared to conventional binary (2^N) or ternary (3^N) liquid crystal PG steering designs, this technique uses fewer elements arranged in a simpler configuration to obtain the same number of steering angles. This advantageous property can be achieved by selecting proper diffraction angles and alignment of the PGs. Due to fewer elements per stage, losses due to electrode absorption and Fresnel reflections are reduced, thereby increasing the overall steering efficiency. Using this approach, we demonstrate a four-stage (N = 4) quasi-ternary beam steering device that achieves 52° Field Of Regard (FOR) with 1.7° resolution (31 steering angles) at 1550 nm wavelength.

Citation Download Citation

Jihwan Kim, Matthew N. Miskiewicz, Steve Serati, and Michael J. Escuti "High efficiency quasi-ternary design for nonmechanical beam-steering utilizing polarization gratings", Proc. SPIE 7816, Advanced Wavefront Control: Methods, Devices, and Applications VIII, 78160G (12 August 2010); https://doi.org/10.1117/12.860885

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