High power, low divergent, substrate emitting quantum cascade ring laser in continuous wave operation

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10 Scopus citations

Abstract

We demonstrate a surface grating coupled substrate emitting quantum cascade ring laser with high power room temperature continuous wave operation at 4.64 μm. A second order surface metal/semiconductor distributed-feedback grating is used for in-plane feedback and vertical out-coupling. A device with 400 μm radius ring cavity exhibits an output power of 202 mW in room temperature continuous wave operation. Single mode operation with a side mode suppression ratio of 25 dB is obtained along with a good linear tuning with temperature. The far field measurement exhibits a low divergent concentric ring beam pattern with a lobe separation of ∼0.34°, which indicates that the device operates in fundamental mode (n = 1).

Original languageEnglish (US)
Article number035505
JournalAPL Materials
Volume5
Issue number3
DOIs
StatePublished - Mar 1 2017

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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