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We report high-performance continuous-wave (C-W) THz quantum cascade lasers with semi-insulating surface-plasmon waveguide. Epitaxial-side down mounting process was developed to enhance heat extraction from the active region. C-W power above 100 mW and C-W wall-plug efficiency above 1.5% was obtained. The highest C-W operation temperature was 70 K.
High-power terahertz quantum cascade lasers at −97.4 μm based on coplanar waveguide epitaxial-side down (Epi-down) mounting technique are presented. With the improved thermal management, excellent performance is obtained for the Epi-down mounted lasers. The maximum output powers of 685 mW in pulsed mode and 164 mW in continuous-wave (C-W) mode are realised at 10 K. The maximum C-W wall-plug efficiency...
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