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Quantum-cascade lasers operating in continuous-wave mode above 90 °C at λ∼5.25 μm

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6 Author(s)
Evans, A. ; Center for Quantum Devices, Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208 ; Nguyen, J. ; Slivken, S. ; Yu, J.S.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2171476 

We report on the design and fabrication of λ∼5.25 μm quantum-cascade lasers (QCLs) for very high temperature continuous-wave (cw) operation. Cw operation is reported up to a maximum temperature of 90 °C (363 K). Cw output power is reported in excess of 500 mW near room temperature with a low threshold current density of 1.4 kA/cm2 at 298 K. Room temperature average power of over 540 mW is reported at 50% duty cycle. A high thermal conductance (Gth) of 340 W/K cm2 is reported for cw QCLs. A finite element thermal model is used to investigate the Gth and maximum cw operating temperature of the QCLs.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 5 )

Date of Publication:

Jan 2006

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