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Title: Mode switching in a multi-wavelength distributed feedback quantum cascade laser using an external micro-cavity

We demonstrate a multi-wavelength distributed feedback (DFB) quantum cascade laser (QCL) operating in a lensless external micro-cavity and achieve switchable single-mode emission at three distinct wavelengths selected by the DFB grating, each with a side-mode suppression ratio larger than 30 dB. Discrete wavelength tuning is achieved by modulating the feedback experienced by each mode of the multi-wavelength DFB QCL, resulting from a variation of the external cavity length. This method also provides a post-fabrication control of the lasing modes to correct for fabrication inhomogeneities, in particular, related to the cleaved facets position.
Authors:
 [1] ;  [2] ; ; ; ;  [1] ;  [3] ;  [4] ; ; ;  [5] ;  [6]
  1. School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, Massachusetts 02138 (United States)
  2. (Switzerland)
  3. Department of Physics, Harvard University, 17 Oxford St., Cambridge, Massachusetts 02138 (United States)
  4. MIT Lincoln Laboratory, 244 Wood St., Lexington, Massachusetts 02420 (United States)
  5. Center for Compound Semiconductors and School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0250 (United States)
  6. Institute for Quantum Electronics, ETH Zurich, Wolfgang-Pauli-Strasse 16, 8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22283265
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 43 PARTICLE ACCELERATORS; CAVITY RESONATORS; DIFFRACTION GRATINGS; FABRICATION; FEEDBACK; LASER RADIATION; PHOTON EMISSION; SOLID STATE LASERS; WAVELENGTHS