Room temperature quantum cascade lasers with 27% wall plug efficiency

Y. Bai, N. Bandyopadhyay, S. Tsao, S. Slivken, M. Razeghi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

339 Scopus citations


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 languageEnglish (US)
Article number181102
JournalApplied Physics Letters
Issue number18
StatePublished - May 2 2011

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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