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

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • R. Wallis
  • Riccardo Degl'Innocenti
  • D. S. Jessop
  • Y. Ren
  • A. Klimont
  • Y. D. Shah
  • O. Mitrofanov
  • C. M. Bledt
  • J. E. Melzer
  • J. A. Harrington
  • H. E. Beere
  • D. A. Ritchie
<mark>Journal publication date</mark>5/10/2015
<mark>Journal</mark>Optics Express
Issue number20
Number of pages12
Pages (from-to)26276-26287
Publication StatusPublished
<mark>Original language</mark>English


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.