Temperature-insensitive long-wavelength (λ ≈14 μm) Quantum Cascade lasers with low threshold

Xue Huang, William O. Charles, Claire F. Gmachl

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We demonstrate high-performance, long-wavelength (λ ≈ "14 μm) Quantum Cascade (QC) lasers based on a diagonal optical transition and a "two-phonon-continuum" depletion scheme in which the lower laser level is depopulated by resonant longitudinal optical phonon scattering followed by scattering to a lower energy level continuum. A 2.8 mm long QC laser shows a low threshold current density of 2.0 kA/cm2, a peak output power of ~336 mW, and a slope efficiency of 375 mW/A, all at 300K, with a high characteristic temperature T0 ~310 K over a wide temperature range from 240 K to 390 K.

Original languageEnglish (US)
Pages (from-to)8297-8302
Number of pages6
JournalOptics Express
Issue number9
StatePublished - Apr 25 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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