Evidence of cascaded emission in a dual-wavelength quantum cascade laser

Kale J. Franz, Daniel Wasserman, Anthony J. Hoffman, David C. Jangraw, Kuen Ting Shiu, Stephen R. Forrest, Claire F. Gmachl

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12 Scopus citations


This letter reports on a quantum cascade laser that exhibits simultaneous dual-wavelength emission from two consecutive optical transitions in each active region. These "cascaded" transitions-a second-excited state to first-excited state and a first-excited state to ground state-yield light at ∼9.5 and ∼8.2 μm, respectively, in good agreement with simulations. The two lasing wavelengths have similar thresholds at the leading edge of a current pulse.

Original languageEnglish (US)
Article number091104
JournalApplied Physics Letters
Issue number9
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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