Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser

Y. J. Han; J. Partington; R. Chhantyal-Pun; E. Nuttall; M. Henry; O. Auriacombe; T. Rawlings; L. H. Li; J. Keeley; M. Oldfield; N. Brewster; R. Dong; P. Dean; A. G. Davies; B. N. Ellison; E. H. Linfield; A. Valavanis

doi:10.1117/12.2528683

6 September 2019 Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser

Y. J. Han, J. Partington, R. Chhantyal-Pun, E. Nuttall, M. Henry, O. Auriacombe, T. Rawlings, L. H. Li, J. Keeley, M. Oldfield, N. Brewster, R. Dong, P. Dean, A. G. Davies, B. N. Ellison, E. H. Linfield, A. Valavanis

Author Affiliations +

Proceedings Volume 11124, Terahertz Emitters, Receivers, and Applications X; 111240Q (2019) https://doi.org/10.1117/12.2528683
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

We present a self-mixing terahertz-frequency gas spectroscopy technique using a multimode quantum cascade laser. A precision-micro-machined external waveguide module and a double-metal quantum cascade laser device are used to increase the optical feedback and the laser’s frequency tuning range. Methanol spectra are obtained using two laser modes at 3.362 THz and 3.428 THz simultaneously, with more than 8 absorption peaks resolved over a 17-GHz bandwidth, which provide minimum detectable absorption coefficients of 2.7×10^-4 cm⁻¹ and 4.9×10⁻⁴ cm⁻¹, respectively. In contrast to all previous self-mixing spectroscopy, our multimode technique expands the sensing bandwidth significantly. This broadband spectroscopy technique can potentially be used for the identification and analysis of chemical, biological radiological and nuclear (CBRN) agents and explosives.

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Y. J. Han, J. Partington, R. Chhantyal-Pun, E. Nuttall, M. Henry, O. Auriacombe, T. Rawlings, L. H. Li, J. Keeley, M. Oldfield, N. Brewster, R. Dong, P. Dean, A. G. Davies, B. N. Ellison, E. H. Linfield, and A. Valavanis "Broadband terahertz gas spectroscopy through multimode self-mixing in a quantum cascade laser", Proc. SPIE 11124, Terahertz Emitters, Receivers, and Applications X, 111240Q (6 September 2019); https://doi.org/10.1117/12.2528683

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KEYWORDS

Quantum cascade lasers

Terahertz radiation

Modes of laser operation

Absorption

Waveguides

Spectroscopy

Spectroscopes

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