High performance "continuum-to-continuum" quantum cascade lasers with a broad gain bandwidth of over 400 cm-1

Yu Yao, Xiaojun Wang, Jen Yu Fan, Claire F. Gmachl

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

A quantum cascade laser structure is demonstrated that provides a broadband gain spectrum of 430 cm-1 with a peak emission wavelength around 4.8 μm. The laser active region is based on multiple transitions from strongly coupled upper states to lower laser states. In spite of the broad gain spectrum, high laser performance was demonstrated with low threshold current density (as low as 1.6 kA/ cm2), large slope efficiency (over 5 W/A) and high wall plug efficiency (up to 23%) in pulsed mode operation at 295 K.

Original languageEnglish (US)
Article number081115
JournalApplied Physics Letters
Volume97
Issue number8
DOIs
StatePublished - Aug 23 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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