Coupling external cavity mid-IR quantum cascade lasers with low loss hollow metallic/dielectric waveguides

Patimisco, P.; Spagnolo, V.; Vitiello, M. S.; Tredicucci, Alessandro; Scamarcio, G.; Bledt, C. M.; Harrington, J. A.

doi:10.1007/s00340-012-4891-2

We report on the optical coupling between hollow core waveguides and external cavity mid-IR quantum cascade lasers (QCLs). Waveguides with 1000 mu m bore size and lengths ranging from 2 to 14 cm, with metallic (Ag)/dielectric (AgI or polystyrene) circular cross-section internal coatings, have been employed. Our results show that the QCL mode is perfectly matched to the hybrid HE11 waveguide mode, demonstrating that the internal dielectric coating thickness is effective to suppress the higher losses TE-like modes. Optical losses down to 0.44 dB/m at 5.27 mu m were measured in Ag/polystyrene-coated waveguide with an almost unitary coupling efficiency.

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Titolo:	Coupling external cavity mid-IR quantum cascade lasers with low loss hollow metallic/dielectric waveguides
Autori:	P. Patimisco V. Spagnolo M. S. Vitiello Tredicucci, Alessandro G. Scamarcio C. M. Bledt J. A. Harrington mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2012
Rivista:	APPLIED PHYSICS. B, LASERS AND OPTICS
Abstract:	We report on the optical coupling between hollow core waveguides and external cavity mid-IR quantum cascade lasers (QCLs). Waveguides with 1000 mu m bore size and lengths ranging from 2 to 14 cm, with metallic (Ag)/dielectric (AgI or polystyrene) circular cross-section internal coatings, have been employed. Our results show that the QCL mode is perfectly matched to the hybrid HE11 waveguide mode, demonstrating that the internal dielectric coating thickness is effective to suppress the higher losses TE-like modes. Optical losses down to 0.44 dB/m at 5.27 mu m were measured in Ag/polystyrene-coated waveguide with an almost unitary coupling efficiency.
Handle:	http://hdl.handle.net/11582/274230
Appare nelle tipologie:	1.1 Articolo in rivista

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