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15 November 2017 Low-cost detection of lasers
David M. Benton
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Optical Engineering, Vol. 56, Issue 11, 114104 (November 2017). https://doi.org/10.1117/1.OE.56.11.114104
Abstract
A low-cost method of detecting lasers based on detecting coherence properties of received light is presented. The method uses an unbalanced Mach–Zehnder interferometer with a modulating piezo-mounted mirror in one arm to discriminate against incoherent background light and identify the presence of laser radiation at the nW level against much brighter backgrounds. The wavelength of the coherent input can be determined by comparing the intensities of the modulation frequency harmonics.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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David M. Benton "Low-cost detection of lasers," Optical Engineering 56(11), 114104 (15 November 2017). https://doi.org/10.1117/1.OE.56.11.114104
Received: 6 September 2017; Accepted: 31 October 2017; Published: 15 November 2017
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Cited by 11 scholarly publications and 1 patent.
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KEYWORDS
Modulation
Interferometers
Sensors
Signal detection
Mirrors
Laser countermeasures
Beam splitters
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