Feedhorn-integrated THz QCL local oscillators for the LOCUS atmospheric sounder

Valavanis, Alexander; Henry, M.; Han, Yazhou; Auriacombe, O.; Dong, Rui; Rawlings, T.; Li, L. H.; Oldfield, M.; Brewster, N.; Davies, A. G.; Ellison, Brian N.; Linfield, Edmund H.

doi:10.1109/irmmw-thz.2016.7758687

Cited by 2 publications

(2 citation statements)

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“…The other symmetrical half-block was attached above the QCL to form a rectangular waveguide (160 × 80 m 2 ) enclosure around the device. The feedhorn and waveguide integrated device was shown to offer significantly improved performance over a non-integrated DM QCL 25 .…”

Section: Device Processmentioning

confidence: 99%

Broadband Terahertz Gas Spectroscopy Through Multimode Self-Mixing in a Quantum Cascade Laser

Han¹,

Partington²,

Chhantyal-Pun³

et al. 2021

Terahertz (THz), Mid Infrared (MIR) and Near Infrared (NIR) Technologies for Protection of Critical Infrastructures Against Exp

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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 increase the optical feedback and the laser's frequency tuning range. Methanol spectra are measured 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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Section: Device Processmentioning

confidence: 99%