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Related Concept Videos

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...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...

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Related Experiment Video

Updated: Jun 22, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
07:42

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Published on: December 15, 2021

Dynamics of frequency shifted feedback lasers: simulation studies.

M Stellpflug, G Bonnet, B Shore

    Optics Express
    |May 26, 2009
    PubMed
    Summary

    This study analyzes frequency shifted feedback (FSF) lasers, revealing five operational regimes through advanced simulations. We predict the operational thresholds for titanium-sapphire and neodymium-doped FSF lasers.

    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Intracavity frequency shifted feedback (FSF) lasers exhibit complex operational properties.
    • Previous studies have described some, but not all, of these characteristics.

    Purpose of the Study:

    • To provide a comprehensive analysis of FSF laser output power dependence on pump-laser power.
    • To detail the effects of FSF on laser operation.
    • To predict operational regimes and thresholds in different laser gain media.

    Main Methods:

    • Utilized an extended rate equation model for simulations.
    • Employed phase space analysis for a deeper understanding.
    • Simulated titanium-sapphire laser operation with FSF.

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    Main Results:

    • Identified five distinct operational regimes in titanium-sapphire FSF lasers, exceeding previously observed experimental regimes.
    • Detailed the influence and behavior of FSF within the laser cavity.
    • Predicted specific thresholds for each regime.

    Conclusions:

    • The extended model accurately captures FSF laser dynamics.
    • Five operational regimes are predicted for FSF lasers, offering new insights.
    • Threshold predictions are provided for both titanium-sapphire and neodymium-doped FSF lasers.