Abstract
A high-power continuous-wave (CW) operation of distributed-feedback quantum-cascade lasers using a buried grating with epitaxial regrowth up to temperatures of above 60°C is demonstrated. For a high-reflectivity-coated 13μm-wide and 3mm-long cavity, CW output powers of 135mW at 25°C and still 37mW at 60°C are obtained. The device exhibits a CW threshold current density of 1.1kA∕cm2, a maximum CW wall-plug efficiency of 1.48% at 25°C, and a characteristic temperature of 177K in pulsed mode. Single-mode emission near 4.8μm with a side-mode suppression ratio of >30dB and a tuning range of ∼8.1cm−1 (i.e., tunability of 0.18cm−1∕K) in the temperature range from 15to60°C is observed.
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