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

from Part III - Applications

Published online by Cambridge University Press:  25 August 2023

Edited by
Dan Botez  and
Mikhail A. Belkin
Dan Botez
Affiliation:
University of Wisconsin, Madison
Mikhail A. Belkin
Affiliation:
Technische Universität München
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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.

Keywords

laser feedback interferometryself-mixingcoherent detectionterahertz imagingterahertz sensing
Type
Chapter
Information
Mid-Infrared and Terahertz Quantum Cascade Lasers , pp. 477 - 508
Publisher: Cambridge University Press
Print publication year: 2023

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