7 September 2011 Terahertz quantum cascade laser coupled with high efficiency to the low loss optical modes of cylindrical hollow-core waveguides
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Abstract
We demonstrate that azimuthally polarized micro-ring THz quantum-cascade lasers can be coupled to hollow metallic waveguides with efficiencies ≥96% and perfectly matched with the TE01 waveguide mode, giving attenuation losses < 3dB/m. The use of Ag coated-flexible pipe waveguides allows propagation of either vertically polarized or azimuthally polarized QCL beams with propagation losses as low as 2.1-4.4 dB/m and bending losses lower than 1.2 dB.
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Miriam S. Vitiello, J. H. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, James A. Harrington, H. E. Beere, D. A. Ritchie, "Terahertz quantum cascade laser coupled with high efficiency to the low loss optical modes of cylindrical hollow-core waveguides", Proc. SPIE 8119, Terahertz Emitters, Receivers, and Applications II, 81190F (7 September 2011); doi: 10.1117/12.899132; https://doi.org/10.1117/12.899132
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