Keeley, J orcid.org/0000-0001-5251-6648, Bertling, K, Rubino, PL orcid.org/0000-0001-8669-6747 et al. (10 more authors) (2019) Detection sensitivity of laser feedback interferometry using a terahertz quantum cascade laser. Optics Letters, 44 (13). pp. 3314-3317. ISSN 0146-9592
Abstract
We report on the high detection sensitivity of a laser feedback interferometry scheme based on a terahertz frequency quantum cascade laser. We show that variations on the laser voltage induced by optical feedback to the laser can be resolved with reinjection of powers as low as ~−125 dB of the emitted power. Our measurements demonstrate a noise equivalent power of ~1.4 pW/√Hz, although after accounting for reinjection losses we estimate this corresponds to only ~1 fW/√Hz being coupled to the quantum cascade laser active region.
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Copyright, Publisher and Additional Information: | © 2019, Optical Society of America. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/) | ||||||||
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Institution: | The University of Leeds | ||||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) | ||||||||
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Depositing User: | Symplectic Publications | ||||||||
Date Deposited: | 05 Jun 2019 12:28 | ||||||||
Last Modified: | 25 Jun 2023 21:51 | ||||||||
Status: | Published | ||||||||
Publisher: | Optical Society of America | ||||||||
Identification Number: | https://doi.org/10.1364/OL.44.003314 | ||||||||
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