Chhantyal-Pun, R, Valavanis, A orcid.org/0000-0001-5565-0463, Keeley, JT et al. (7 more authors) (2018) Gas spectroscopy with integrated frequency monitoring through self-mixing in a terahertz quantum-cascade laser. Optics Letters, 43 (10). pp. 2225-2228. ISSN 0146-9592
Abstract
We demonstrate a gas spectroscopy technique, using self-mixing in a 3.4 terahertz quantum-cascade laser (QCL). All previous QCL spectroscopy techniques have required additional terahertz instrumentation (detectors, mixers, or spectrometers) for system pre-calibration or spectral analysis. By contrast, our system self-calibrates the laser frequency (i.e., with no external instrumentation) to a precision of 630 MHz (0.02%) by analyzing QCL voltage perturbations in response to optical feedback within a 0–800 mm round-trip delay line. We demonstrate methanol spectroscopy by introducing a gas cell into the feedback path and show that a limiting absorption coefficient of ∼1×10⁻⁴ cm⁻¹ is resolvable.
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Copyright, Publisher and Additional Information: | © 2018 Optical Society of America. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ | ||||||||
Keywords: | Semiconductor lasers, quantum cascade; Spectroscopy, terahertz; Interferometry | ||||||||
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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) | ||||||||
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Depositing User: | Symplectic Publications | ||||||||
Date Deposited: | 14 Mar 2018 11:40 | ||||||||
Last Modified: | 05 May 2018 03:58 | ||||||||
Status: | Published | ||||||||
Publisher: | Optical Society of America | ||||||||
Identification Number: | https://doi.org/10.1364/OL.43.002225 | ||||||||
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