Multi-Watt high-power THz frequency quantum cascade lasers

Multi-Watt high-power terahertz (THz) frequency quantum cascade lasers are demonstrated, based on a single, epitaxially grown, 24-μm-thick active region embedded into a surface-plasmon waveguide. The devices emit in pulsed mode at a frequency of ∼4.4 THz and have a maximum operating temperature of 132 K. The
maximum measurable emitted powers from a single facet are ∼2.4 W at 10 K and ∼1.8 W at 77 K.

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