Study of QCL Laser Sources for the Realization of Advanced Sensors

Sensors

Giuseppe de Risi¹  Lorenzo Luigi Columbo¹  Massimo Brambilla¹  Vincenzo Spagnolo² 

[1] Dipartimento Interareneo di Fisica, Università degli Studi e Politecnico di Bari, via Amendola 173, I-70126 Bari, Italy; E-Mails:Dipartimento Interareneo di Fisica, Università degli Studi e Politecnico di Bari, via Amendola 173, I-70126 Bari, Italy;

关键词: quantum cascade laser;    optical feedback interferometry;    nano displacement sensing;    laser sensors;   

DOI  :  10.3390/s150819140

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.