Broadband quantum cascade laser gain medium based on a "continuum-to- bound" active region design

Yu Yao, William O. Charles, Tracy Tsai, Jianxin Chen, Gerard Wysocki, Claire F. Gmachl

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Abstract

We present quantum cascade laser designs at 7-9 μm with two lower injector states strongly coupled with the upper laser state at the operating electric fields. Optical transitions from these three coupled states contribute to a large gain spectrum width (∼250 cm-1 full width at half maximum), which enables external cavity tuning of the lasers over 200 cm-1. Lasers show comparable performance to the conventional narrow band design at a similar wavelength with a peak modal gain coefficient of ∼10 kA/cm, a slope efficiency ∼1 W/A, and good temperature performance (T 0=170 K) in pulsed mode operation at 295 K.

Original languageEnglish (US)
Article number211106
JournalApplied Physics Letters
Volume96
Issue number21
DOIs
StatePublished - May 24 2010
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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