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Gas spectroscopy through multimode self-mixing in a double-metal terahertz quantum cascade laser


Han, Y J; Partington, J; Chhantyal-Pun, R; Henry, M; Auriacombe, O; Rawlings, T; Li, L H; Keeley, J; Oldfield, M; Brewster, N; Dong, R; Dean, P; Davies, A G; Ellison, B N; Linfield, E H; Valavanis, A (2018). Gas spectroscopy through multimode self-mixing in a double-metal terahertz quantum cascade laser. Optics letters, 43(24):5933-5936.

Abstract

A multimode self-mixing terahertz-frequency gas absorption spectroscopy is demonstrated based on a quantum cascade laser. A double-metal device configuration is used to expand the laser's frequency tuning range, and a precision-micromachined external waveguide module is used to enhance the optical feedback. Methanol spectra are measured using two laser modes at 3.362 and 3.428 THz, simultaneously, with more than eight absorption peaks resolved over a 17 GHz bandwidth, which provide the noise-equivalent absorption sensitivity of 1.20×10  cm Hz and 2.08×10  cm Hz, respectively. In contrast to all previous self-mixing spectroscopy, our multimode technique expands the sensing bandwidth and duty cycle significantly.

Abstract

A multimode self-mixing terahertz-frequency gas absorption spectroscopy is demonstrated based on a quantum cascade laser. A double-metal device configuration is used to expand the laser's frequency tuning range, and a precision-micromachined external waveguide module is used to enhance the optical feedback. Methanol spectra are measured using two laser modes at 3.362 and 3.428 THz, simultaneously, with more than eight absorption peaks resolved over a 17 GHz bandwidth, which provide the noise-equivalent absorption sensitivity of 1.20×10  cm Hz and 2.08×10  cm Hz, respectively. In contrast to all previous self-mixing spectroscopy, our multimode technique expands the sensing bandwidth and duty cycle significantly.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Neuroradiology
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Physical Sciences > Atomic and Molecular Physics, and Optics
Language:English
Date:15 December 2018
Deposited On:15 Feb 2019 08:43
Last Modified:29 Jul 2020 09:21
Publisher:Optical Society of America
ISSN:0146-9592
OA Status:Closed
Publisher DOI:https://doi.org/10.1364/OL.43.005933
PubMed ID:30547973

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