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Distributed-Feedback Quantum-Cascade Lasers at 9 \mu m Operating in Continuous Wave Up to 423 K

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6 Author(s)
Wittmann, Andreas ; Inst. for Quantum Electron., ETH Zurich, Zurich ; Bonetti, Yargo ; Fischer, M. ; Faist, J.
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Single-mode lasers operating at lambda ap 9 mum in continuous wave up to 423 K (150degC) were achieved by the combination of strong distributed-feedback coupling, a narrow gain active region design, low intersubband, and free-carrier losses as well as a good thermal management. Tuning of 10 cm-1 or 0.9% of the center frequency was achieved by heating the device. The threshold current density varies from 1.1 kA/cm2 at 303 K to 2.4 kA/cm2 at 423 K. Other devices with low electrical power consumption of 1.6 and 3.8 W for an optical output power of 16 and 100 mW have been demonstrated at 263 K.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 12 )