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External cavity cascade diode lasers tunable from 3.05 to 3.25 μm

  • Meng Wang
  • , Takashi Hosoda
  • , Leon Shterengas
  • , Gela Kipshidze
  • , Ming Lu
  • , Aaron Stein
  • , Gregory Belenky
  • Stony Brook University
  • Brookhaven National Laboratory

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The external cavity tunable mid-infrared emitters based on Littrow configuration and utilizing three stages type-I quantum well cascade diode laser gain elements were designed and fabricated. The free-standing coated 7.5-μm-wide ridge waveguide lasers generated more than 30 mW of continuous wave power near 3.25 μm at 20°C when mounted epi-side-up on copper blocks. The external cavity lasers (ECLs) utilized 2-mm-long gain chips with straight ridge design and anti-/neutral-reflection coated facets. The ECLs demonstrated narrow spectrum tunable operation with several milliwatts of output power in spectral region from 3.05 to 3.25 μm corresponding to ∼25 meV of tuning range.

Original languageEnglish
Article number011012
JournalOptical Engineering
Volume57
Issue number1
DOIs
StatePublished - Jan 1 2018

Keywords

  • external cavity laser
  • GaSb
  • mid-infrared
  • quantum cascade
  • tunable laser

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