Quantum-cascade lasers operating in continuous-wave mode above 90 °c at λ∼5.25 μm

A. Evans, J. Nguyen, S. Slivken, J. S. Yu, S. R. Darvish, M. Razeghi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


We report on the design and fabrication of λ∼5.25 μm quantum-cascade lasers (QCLs) for very high temperature continuous-wave (cw) operation. Cw operation is reported up to a maximum temperature of 90 °C (363 K). Cw output power is reported in excess of 500 mW near room temperature with a low threshold current density of 1.4 kA cm2 at 298 K. Room temperature average power of over 540 mW is reported at 50% duty cycle. A high thermal conductance (Gth) of 340 WK cm2 is reported for cw QCLs. A finite element thermal model is used to investigate the Gth and maximum cw operating temperature of the QCLs.

Original languageEnglish (US)
Article number051105
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number5
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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