Investigation of the spectral width of quantum cascade laser emission near 5.2 μm by a heterodyne experiment

Heiko Ganser, Bertold Frech, Andreas Jentsch, Manfred Mürtz, Claire Gmachl, Federico Capasso, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, Alfred Y. Cho, Wolfgang Urban

Research output: Contribution to journalArticle

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Abstract

We report line width measurements of a quantum cascade distributed feedback laser by a heterodyne experiment. At currents slightly above threshold and a laser output power higher than 1 mW, the full width at half maximum of the beat signal was narrower than 0.5 MHz, which gives us an upper limit of the laser line width. As reference laser we used a carbon monoxide laser. Both lasers were operating unstabilized in continuous wave mode emitting light at about 5.2 μm.

Original languageEnglish (US)
Pages (from-to)127-130
Number of pages4
JournalOptics Communications
Volume197
Issue number1-3
DOIs
StatePublished - Sep 15 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Beat note
  • Line width
  • Mid infrared
  • Quantum cascade laser
  • Spectroscopy

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    Ganser, H., Frech, B., Jentsch, A., Mürtz, M., Gmachl, C., Capasso, F., Sivco, D. L., Baillargeon, J. N., Hutchinson, A. L., Cho, A. Y., & Urban, W. (2001). Investigation of the spectral width of quantum cascade laser emission near 5.2 μm by a heterodyne experiment. Optics Communications, 197(1-3), 127-130. https://doi.org/10.1016/S0030-4018(01)01441-9