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Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications
CNR-IFN and Dipartimento Interateneo di Fisica, Università and Politecnico di Bari, Via Amendola 173, I-70126 Bari, Italy
CNR-Dipartimento di Scienze Fisiche e Tecnologie della Materia, Largo E. Fermi 5, 50125 Firenze, Italy
NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy
Department of Material Science & Engineering, Rutgers University, Piscataway, NJ 08855, USA
* Author to whom correspondence should be addressed.
Received: 19 November 2012; in revised form: 8 January 2013 / Accepted: 9 January 2013 / Published: 21 January 2013
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
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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.
Patimisco P, Spagnolo V, Vitiello MS, Scamarcio G, Bledt CM, Harrington JA. Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications. Sensors. 2013; 13(1):1329-1340.
Patimisco, Pietro; Spagnolo, Vincenzo; Vitiello, Miriam S.; Scamarcio, Gaetano; Bledt, Carlos M.; Harrington, James A. 2013. "Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications." Sensors 13, no. 1: 1329-1340.