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Low-Threshold Continuous-Wave Operation of Distributed-Feedback Quantum Cascade Laser at \lambda \sim 4.6 \mu m

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9 Author(s)
Jinchuan Zhang ; Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China ; Lijun Wang ; Song Tan ; Wanfeng Liu
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Room-temperature continuous-wave (CW) operation of distributed-feedback quantum cascade laser (DFB-QCL) emitting at 4.6 μm is presented. Strain-compensation combined with two-phonon resonance in active region design promises low-threshold current density. A record low-threshold current density of 1 kA/cm2 for DFB-QCL operated in CW mode at 30°C is realized without a high-reflectivity coating on the rear facet. Reliable dynamic single-mode emission with a sidemode suppression ratio of about 30 dB is achieved from 10 to 50°C.

Published in:

IEEE Photonics Technology Letters  (Volume:23 ,  Issue: 18 )