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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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