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3.5 THz quantum-cascade laser emission from dual diagonal feedhorns

  • B. N. Ellison (a1), A. Valavanis (a2), O. Auriacombe (a1), D. Gerber (a1), T. Rawlings (a1), N. Brewster (a1), M. L. Oldfield (a1), Y. Han (a2), L. H. Li (a2), E. Zafar (a2), E. H. Linfield (a2), A. G. Davies (a2), G. Savini (a3), M. Emes (a4), B. Winter (a4), D. Walker (a5) and E. Saenz (a6)...

Abstract

Antenna-pattern measurements obtained from a double-metal supra-terahertz-frequency (supra-THz) quantum cascade laser (QCL) are presented. The QCL is mounted within a mechanically micro-machined waveguide cavity containing dual diagonal feedhorns. Operating in continuous-wave mode at 3.5 THz, and at an ambient temperature of ~60 K, QCL emission has been directed via the feedhorns to a supra-THz detector mounted on a multi-axis linear scanner. Comparison of simulated and measured far-field antenna patterns shows an excellent degree of correlation between beamwidth (full-width-half-maximum) and sidelobe content and a very substantial improvement when compared with unmounted devices. Additionally, a single output has been used to successfully illuminate and demonstrate an optical breadboard arrangement associated with a future supra-THz Earth observation space-borne payload. Our novel device has therefore provided a valuable demonstration of the effectiveness of supra-THz diagonal feedhorns and QCL devices for future space-borne ultra-high-frequency Earth-observing heterodyne radiometers.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Author for correspondence: B. N. Ellison, E-mail: brian.ellison@stfc.ac.uk

References

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