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1 results

  • 15 - Self-Mixing in Quantum Cascade Lasers: Theory and Applications

  • from Part III - Applications
  • Edited by Dan Botez, University of Wisconsin, Madison, Mikhail A. Belkin, Technische Universität München
  • Book:
    Mid-Infrared and Terahertz Quantum Cascade Lasers
    Published online:
    25 August 2023
    Print publication:
    14 September 2023, pp 477-508

  • Summary

    Laser feedback interferometry, based on the self-mixing (SM) effect in quantum cascade lasers (QCLs), is one of the simplest coherent techniques, for which the emission source can also play the role of a highly-sensitive detector. The combination of QCLs and SM is particularly attractive for sensing applications, notably in the THz band where it provides a high-speed high-sensitivity detection mechanism which inherently suppresses unwanted background radiation. The SM phenomenon in QCLs has been exploited for a wide range of applications, including the measurement of internal laser characteristics, two- and three-dimensional imaging, materials analysis and near-field imaging. This chapter provides an overview of the SM effect in QCLs, and reviews the state of the art in sensing using this technique.