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Sensors 2015, 15(8), 19140-19156; doi:10.3390/s150819140

Study of QCL Laser Sources for the Realization of Advanced Sensors

1
Dipartimento Interareneo di Fisica, Università degli Studi e Politecnico di Bari, via Amendola 173, I-70126 Bari, Italy
2
CNR—Istituto di Fotonica e Nanotecnologie UOS Bari, via Amendola 173, I-70126 Bari, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Vincenzo Spagnolo and Dragan Indjin
Received: 7 May 2015 / Revised: 22 July 2015 / Accepted: 27 July 2015 / Published: 5 August 2015
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
View Full-Text   |   Download PDF [1282 KB, uploaded 5 August 2015]   |  

Abstract

We study the nonlinear dynamics of a quantum cascade laser (QCL) with a strong reinjection provided by the feedback from two external targets in a double cavity configuration. The nonlinear coupling of interferometric signals from the two targets allows us to propose a displacement sensor with nanometric resolution. The system exploits the ultra-stability of QCLs in self-mixing configuration to access the intrinsic nonlinearity of the laser, described by the Lang–Kobayashi model, and it relies on a stroboscopic-like effect in the voltage signal registered at the QCL terminals that relates the “slow” target motion to the “fast” target one. View Full-Text
Keywords: quantum cascade laser; optical feedback interferometry; nano displacement sensing; laser sensors quantum cascade laser; optical feedback interferometry; nano displacement sensing; laser sensors
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

de Risi, G.; Columbo, L.L.; Brambilla, M. Study of QCL Laser Sources for the Realization of Advanced Sensors. Sensors 2015, 15, 19140-19156.

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