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MDPI, Sensors, 1(13), p. 1329-1340, 2013

DOI: 10.3390/s130101329

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

Journal article published in 2013 by Pietro Patimisco, Vincenzo Spagnolo, Miriam S. Vitiello, Gaetano Scamarcio ORCID, Carlos M. Bledt, James A. Harrington
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 HE(11) 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.