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2.4 W room temperature continuous wave operation of distributed feedback quantum cascade lasers

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5 Author(s)
Lu, Q.Y. ; Department of Electrical Engineering and Computer Science, Center for Quantum Devices, Northwestern University, Evanston, Illinois 60208, USA ; Bai, Y. ; Bandyopadhyay, N. ; Slivken, S.
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We demonstrate high power continuous-wave room-temperature operation surface-grating distributed feedback quantum cascade lasers at 4.8 μm. High power single mode operation benefits from a combination of high-reflection and antireflection coatings. Maximum single-facet continuous-wave output power of 2.4 W and peak wall plug efficiency of 10% from one facet is obtained at 298 K. Single mode operation with a side mode suppression ratio of 30 dB and single-lobed far field without beam steering is observed.

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Applied Physics Letters  (Volume:98 ,  Issue: 18 )