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Title: Extended and quasi-continuous tuning of quantum cascade lasers using superstructure gratings and integrated heaters

In this work, we demonstrate broad electrical tuning of quantum cascade lasers at 9.25 μm, 8.5 μm, and 4.4 μm in continuous wave operation using Vernier-effect distributed Bragg reflectors based on superstructure gratings. Integrated micro-heaters allow to switch from one Vernier channel to the other, while predictable and mode-hop free tuning can be obtained in each channel modulating the laser current with a side mode suppression ratio as high as 30 dB. The resulting device behaves effectively as a switchable multicolour tunable source. Tuning up to 6.5% of the central wavelength is observed. To prove the importance of the developed devices for high resolution molecular spectroscopy, a N{sub 2}O absorption spectrum has been measured.
Authors:
 [1] ;  [2] ; ; ; ; ; ;  [1] ;  [3]
  1. Alpes Lasers SA, 1-3 Passsage Max Meuron, CH-2001 Neuchâtel (Switzerland)
  2. (Switzerland)
  3. Institute for Quantum Electronics, ETH-Zurich, CH-8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22486146
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION SPECTRA; GRATINGS; HEATERS; LASERS; NITROUS OXIDE; RESOLUTION; SPECTROSCOPY; SWITCHES; TUNING