Phase-locked, high power, mid-infrared quantum cascade laser arrays

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Abstract

We demonstrate phase-locked, high power quantum cascade laser arrays, which are combined using a monolithic, tree array multimode interferometer, with emission wavelengths around 4.8 μm. A maximum output power of 15 W was achieved from an eight-element laser array, which has only a slightly higher threshold current density and a similar slope efficiency compared to a Fabry-Perot laser of the same length. Calculated multimode interferometer splitting loss is on the order of 0.27 dB for the in-phase supermode. In-phase supermode operation with nearly ideal behavior is demonstrated over the working current range of the array.

Original languageEnglish (US)
Article number181106
JournalApplied Physics Letters
Volume112
Issue number18
DOIs
StatePublished - Apr 30 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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