Room-temperature continuous-wave operation of quantum-cascade lasers at λ∼4 μm

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


High-power cw λ∼4 μm quantum-cascade lasers (QCLs) are demonstrated. The effect of different cavity length and laser die bonding is also investigated. For a high-reflectivity-coated 11-μm -wide and 4-mm -long epilayer-down bonded QCL, cw output powers as high as 1.6 W at 80 K and 160 mW at 298 K are obtained, and the cw operation is achieved up to 313 K with 12 mW. The laser exhibits a threshold current density of 1.96 kA cm2, a slope efficiency of 737 mWA, and a maximum wall-plug efficiency of 0.9% under cw mode at 298 K. In pulsed mode, a maximum average power of 552 mW at 298 K is achieved at 45% duty cycle and a characteristic temperature is 176 K from 80 to 393 K.

Original languageEnglish (US)
Article number041111
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number4
StatePublished - 2006

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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