Abstract
The authors present high-power continuous-wave (cw) operation of distributed-feedback quantum-cascade lasers. Continuous-wave output powers of 56mW at 25°C and 15mW at 40°C are obtained. Single-mode emission near 7.8μm with a side-mode suppression ratio of ⩾30dB and a tuning range of 2.83cm−1 was obtained between 15 and 40°C. The device exhibits no beam steering with a full width at half maximum of 27.4° at 25°C in cw mode.
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