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

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

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We report on the optical coupling between hollow core waveguides and external cavity mid-IR quantum cascade lasers (QCLs). Waveguides with 1000 μm 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 HE 11 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 μm were measured in Ag/polystyrene-coated waveguide with an almost unitary coupling efficiency.

Original languageEnglish (US)
Pages (from-to)255-260
Number of pages6
JournalApplied Physics B: Lasers and Optics
Volume108
Issue number2
DOIs
StatePublished - Aug 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

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