High-power continuous-wave (cw) operation of distributed-feedback quantum-cascade lasers is reported. Continuous-wave output powers of 100 mW at 25 °C and 20 mW at 50 °C are obtained. The device exhibits a cw threshold current density of 1.34 kA cm2, a maximum cw wall-plug efficiency of 1% at 25 °C, and a characteristic temperature of ∼190 K in pulsed mode. Single-mode emission near 9.6 μm with a side-mode suppression ratio of ≥30 dB and a tuning range of 2.89 cm-1 from 15 to 50 °C is obtained.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)