High-power epitaxial-side down mounted terahertz quantum cascade lasers

摘要

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 of 1.67% is also realised. Fundamental lateral mode emissions are achieved for wide ridge lasers through a mode loss differentiation process.