Widely tunable quantum cascade lasers with coupled cavities for gas detection

Peter Fuchs*, Jochen Seufert, Johannes Koeth, Julia Semmel, Sven Höfling, Lukas Worschech, Alfred Forchel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The authors report the fabrication of widely tunable monolithic quantum cascade lasers (QCLs) with coupled Fabry-Perot (FP) cavities on indium phosphide. Quasicontinuous tuning of the single mode emission over a total spectral range of 242 nm was realized at two regions between 8.394 and 8.785 mu m. An absorption experiment with ammonia shows principle feasibility of gas detection with multisegment QCL devices. Good agreement of the experimentally observed tuning behavior with the one expected from calculated FP mode-combs indicates that the change in the refractive index is mainly due to thermal heating as a result of current injection. (C) 2010 American Institute of Physics. [doi:10.1063/1.3514247]

Original languageEnglish
Article number181111
Number of pages3
JournalApplied Physics Letters
Volume97
Issue number18
DOIs
Publication statusPublished - 1 Nov 2010

Keywords

  • LINEWIDTH ENHANCEMENT FACTOR
  • HIGH-AVERAGE-POWER
  • ROOM-TEMPERATURE
  • MU-M
  • DISTRIBUTED-FEEDBACK
  • SINGLE-MODE

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