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Integrating THz quantum cascade lasers with flexible dielectric-lined hollow metallic waveguides: Moving beyond free space optics

Wallis, R; Degl'Innocenti, R; Jessop, DS; Ren, Y; Mitrofanov, O; Bledt, CM; Melzer, JE; ... Ritchie, DA; + view all (2016) Integrating THz quantum cascade lasers with flexible dielectric-lined hollow metallic waveguides: Moving beyond free space optics. In: Proceedings of the 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE Green open access

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Abstract

We demonstrate a THz optical delivery system capable of supplying a low divergence HE 11 Gaussian beam at a distance of >500mm from the facet of a THz quantum cascade laser. This is achieved by optimising the optical coupling to an external hollow flexible polystyrene-lined Ag waveguide, by utilising a monolithically integrated cylindrical metal waveguide in the laser mounting block. This is shown to achieve >80% coupling efficiency between the two waveguides, whilst maintaining the spectral integrity of the laser. A comparison with other excitation geometries, such as bare laser excitation, as well as a laser with a facet coupled silicon lens, is also analysed.

Type: Proceedings paper
Title: Integrating THz quantum cascade lasers with flexible dielectric-lined hollow metallic waveguides: Moving beyond free space optics
Event: 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Location: Copenhagen, DENMARK
Dates: 25 September 2016 - 30 September 2016
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/IRMMW-THz.2016.7758564
Publisher version: https://doi.org/10.1109/IRMMW-THz.2016.7758564
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Physical Sciences, Engineering, Electrical & Electronic, Physics, Applied, Engineering, Physics, TRANSMISSION
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10094150
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