Wallis, R. and Degl'Innocenti, Riccardo and Jessop, D. S. and Ren, Y. and Mitrofanov, O. and Bledt, C. M. and Melzer, J. E. and Harrington, J. A. and Beere, H. E. and Ritchie, D. A. (2016) Integrating THz quantum cascade lasers with flexible dielectric-lined hollow metallic waveguides:Moving beyond free space optics. In: 41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016. IEEE Computer Society, DNK. ISBN 9781467384865
Full text not available from this repository.Abstract
We demonstrate a THz optical delivery system capable of supplying a low divergence HE11 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.