Laser detection using liquid crystal polarization modulators

David M. Benton

doi:10.1117/1.OE.59.6.064106

Laser detection using liquid crystal polarization modulators

David M. Benton

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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.

Original language	English
Article number	064106
Journal	Optical Engineering
Volume	59
Issue number	6
DOIs	https://doi.org/10.1117/1.OE.59.6.064106
Publication status	Published - 8 Jun 2020

Bibliographical note

Copyright 2020 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

interferometry
laser detection
liquid crystal

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10.1117/1.OE.59.6.064106

Laser detection using liquid crystal polarization modulators
Copyright 2020 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Final published version, 1.34 MB

Cite this

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AB - 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.

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Laser detection using liquid crystal polarization modulators

Abstract

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