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8 June 2020 Laser detection using liquid crystal polarization modulators
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Abstract

Lasers can be identified by their relatively long coherence lengths using interferometry. A Mach–Zehnder interferometer incorporating liquid crystal polarization modulators is demonstrated as a means of low-cost, robust laser detection. Temporal modulations, as a signature of coherence, can be induced by modulating polarization changes in liquid crystal modulators using low voltages. Sensitivities of <10  nW can be achieved. The suitability as a means of laser detection is discussed.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
David M. Benton "Laser detection using liquid crystal polarization modulators," Optical Engineering 59(6), 064106 (8 June 2020). https://doi.org/10.1117/1.OE.59.6.064106
Received: 6 April 2020; Accepted: 1 June 2020; Published: 8 June 2020
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