Journal
APPLIED PHYSICS LETTERS
Volume 78, Issue 14, Pages 1964-1966Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1360225
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High average power quantum cascade lasers at 9.3 mum using InP top cladding layers and both junction up and junction down mounting are presented. A 3 mm long, junction up mounted device emitted 54 mW average power at 30 degreesC and 11.5% duty cycle with a threshold current density of 3.72 kA/cm(2). A similar, but only 1.5 mm long device with high reflection coating on both facets was mounted junction down and tested at even higher duty cycles. At -27 degreesC, we achieved continuous wave operation with a threshold current density of 3.3 kA/cm(2). (C) 2001 American Institute of Physics.
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