Abstract
Using the recently proposed shallow-well design, we demonstrate InP based quantum cascade lasers (QCLs) emitting around 4.9 μm with 27% and 21% wall plug efficiencies in room temperature (298 K) pulsed and continuous wave (cw) operations, respectively. The laser core consists of 40 QCL-stages. The highest cw efficiency is obtained from a buried-ridge device with a ridge width of 8 μm and a cavity length of 5 mm. The front and back facets are antireflection and high-reflection coated, respectively. The maximum single facet cw power at room temperature amounts to 5.1 W.
Original language | English (US) |
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Article number | 181102 |
Journal | Applied Physics Letters |
Volume | 98 |
Issue number | 18 |
DOIs | |
State | Published - May 2 2011 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)