Optimising backscatter from multiple beam interference

O'Donnell, L., Padgett, M. J. and Johnson, S. D. (2021) Optimising backscatter from multiple beam interference. Optics Express, 29(6), pp. 8770-8776. (doi: 10.1364/OE.420384)

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Optical sensing applications are usually reliant on the intensity of the measured signal. For remote sensing applications where a target is probed with a laser beam, the sensitivity will be limited by the amount of backscattered light returned from the target to the detector. We demonstrate a method of increasing the signal returned to the detector by illuminating the target with a number of independently controlled beams, where both the position and phase are optimised. We show an improvement in the backscattered signal that is proportional to the number of beams used. The method is demonstrated within a laser microphone, measuring audio signal due to vibrations in surfaces, showing a significant improvement in the signal-to-noise of the measurement.

Item Type:Articles
Additional Information:Funding: Engineering and Physical Sciences Research Council (EP/M01326X/1, EP/S026444/1); Defence Science and Technology Laboratory.
Glasgow Author(s) Enlighten ID:Johnson, Dr Steven and O'Donnell, Laura and Padgett, Professor Miles
Authors: O'Donnell, L., Padgett, M. J., and Johnson, S. D.
College/School:College of Science and Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Copyright Holders:Copyright © 2021 The Optical Society
First Published:First published in Optics Express 29(6):8770-8776
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190841UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/M01326X/1P&S - Physics & Astronomy
305029Looking and Listening in Complex Media - UDRADaniele FaccioEngineering and Physical Sciences Research Council (EPSRC)EP/S026444/1P&S - Physics & Astronomy