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Continuous-wave operation of distributed-feedback quantum cascade laser with ultra-low threshold current density

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8 Author(s)
J. C. Zhang ; Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Department of Electronic Engineering, Tsinghua University, Beijing, People's Republic of China ; L. J. Wang ; J. Y. Chen ; L. H. Zhao
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Continuous-wave operation of a distributed-feedback quantum cascade laser emitting at around 4.6 m grown by solid source molecular beam epitaxy combined with metal organic vapour phase epitaxy is presented. These devices display an ultra-low threshold current density of 0.85 kA/cm2 at 30°C. The low threshold characteristics resulted in continuous-wave operating temperature up to 100°C for thermoelectrically cooled devices and room-temperature continuous-wave output power in excess of 8.5 mW for uncooled devices.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 24 )