High-temperature continuous-wave operation of λ∼8 μm quantum cascade lasers

Steven Boyd Slivken*, A. Matlis, C. Jelen, A. Rybaltowski, J. Diaz, Manijeh Razeghi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We report single-mode continuous-wave operation of a λ∼8 μm quantum cascade laser at 140 K. The threshold current density is 4.2 kA/cm2 at 300 K in pulsed mode and 2.5 kA/cm2 at 140 K in continuous wave for 2 mm long index-guided laser cavities of 20 μm width. Wide stripe (W ∼100 μm), index-guided lasers from the same wafer in pulsed operation demonstrate an average T0 of 210 K with other wafers demonstrating a T0 as high as 290 K for temperatures from 80 to 300 K. This improvement in high-temperature performance is a direct result of three factors: excellent material quality, a low-loss waveguide design, and a low-leakage index-guided laser geometry.

Original languageEnglish (US)
Pages (from-to)173-175
Number of pages3
JournalApplied Physics Letters
Issue number2
StatePublished - Jan 11 1999

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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