Intrinsic stability of quantum cascade lasers against optical feedback

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Updated: May 10, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

F P Mezzapesa1, L L Columbo, M Brambilla

  • 1CNR-IFN UOS Bari, Bari, Italy. francesco.mezzapesa@uniba.it

Optics Express
|June 6, 2013
PubMed

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Effects of feedback01:24

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...