High-power, room-temperature, and continuous-wave operation of distributed-feedback quantum-cascade lasers at λ∼4.8 μm

Yu, J. S.; Slivken, S.; Darvish, S. R.; Evans, A.; Gokden, B.; Razeghi, M.
July 2005
Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p041104
Academic Journal
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 13 μm-wide and 3 mm-long cavity, CW output powers of 135 mW at 25 °C and still 37 mW at 60 °C are obtained. The device exhibits a CW threshold current density of 1.1 kA/cm2, a maximum CW wall-plug efficiency of 1.48% at 25 °C, and a characteristic temperature of 177 K in pulsed mode. Single-mode emission near 4.8 μm with a side-mode suppression ratio of >30 dB and a tuning range of ∼8.1 cm-1 (i.e., tunability of 0.18 cm-1/K) in the temperature range from 15 to 60 °C is observed.


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