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Sensors 2013, 13(1), 1329-1340; doi:10.3390/s130101329
Article

Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications

1,* , 1
,
2,3
,
1
,
4
 and
4
1 CNR-IFN and Dipartimento Interateneo di Fisica, Università and Politecnico di Bari, Via Amendola 173, I-70126 Bari, Italy 2 CNR-Dipartimento di Scienze Fisiche e Tecnologie della Materia, Largo E. Fermi 5, 50125 Firenze, Italy 3 NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy 4 Department of Material Science & Engineering, Rutgers University, Piscataway, NJ 08855, USA
* Author to whom correspondence should be addressed.
Received: 19 November 2012 / Revised: 8 January 2013 / Accepted: 9 January 2013 / Published: 21 January 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
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Abstract

We report on single mode optical transmission of hollow core glass waveguides (HWG) coupled with an external cavity mid-IR quantum cascade lasers (QCLs). The QCL mode results perfectly matched to the hybrid HE11 waveguide mode and the higher losses TE-like modes have efficiently suppressed by the deposited inner dielectric coating. Optical losses down to 0.44 dB/m and output beam divergence of ~5 mrad were measured. Using a HGW fiber with internal core size of 300 µm we obtained single mode laser transmission at 10.54 µm and successful employed it in a quartz enhanced photoacoustic gas sensor setup.
Keywords: hollow glass waveguide; quantum cascade laser; gas sensing; quartz enhanced photoacoustic spectroscopy hollow glass waveguide; quantum cascade laser; gas sensing; quartz enhanced photoacoustic spectroscopy
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Patimisco, P.; Spagnolo, V.; Vitiello, M.S.; Scamarcio, G.; Bledt, C.M.; Harrington, J.A. Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications. Sensors 2013, 13, 1329-1340.

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