Efficient coupling of double-metal terahertz quantum cascade lasers to flexible dielectriclined hollow metallic waveguides

R. Wallis, R. Degl'Iinnocenti, D. S. Jessop, Y. Ren, A. Klimont, Y. D. Shah, O. Mitrofanov, C. M. Bledt, J. E. Melzer, H. E. Beere, D. A. Ritchie

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The growth in terahertz frequency applications utilising the quantum cascade laser is hampered by a lack of targeted power delivery solutions over large distances (>100 mm). Here we demonstrate the efficient coupling of double-metal quantum cascade lasers into flexible polystyrene lined hollow metallic waveguides via the use of a hollow copper waveguide integrated into the laser mounting block. Our approach exhibits low divergence, Gaussian-like emission, which is robust to misalignment error, at distances > 550 mm, with a coupling efficiency from the hollow copper waveguide into the flexible waveguide > 90%. We also demonstrate the ability to nitrogen purge the flexible waveguide, increasing the power transmission by up to 20% at 2.85 THz, which paves the way for future fibre based terahertz sensing and spectroscopy applications.

Original languageEnglish (US)
Pages (from-to)26276-26287
Number of pages12
JournalOptics Express
Volume23
Issue number20
DOIs
StatePublished - Oct 5 2015

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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