Low Cost Detection of Lasers

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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.
Original languageEnglish
Article number114104
JournalOptical Engineering
Issue number11
Publication statusPublished - 15 Nov 2017

Bibliographical note

© The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

Funding: Centre for Defence Enterprise within UK MoD.


  • laser detection; modulation; wavelength measurement


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