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Related Concept Videos

Load-frequency control01:28

Load-frequency control

Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Fiber-laser-based difference frequency generation scheme for carrier-envelope-offset phase stabilization

Yujun Deng, Fei Lu, Wayne Knox

    Optics Express
    |June 5, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber-laser system demonstrates difference frequency generation for carrier-envelope-offset phase self-stabilization. This method efficiently generates low-noise 615-nm pulses, paving the way for stabilized fiber-laser sources.

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    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

    Published on: November 22, 2019

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    Last Updated: Jun 22, 2026

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    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

    Published on: November 22, 2019

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • Carrier-envelope-offset (CEO) phase stabilization is crucial for precision spectroscopy and frequency metrology.
    • Existing methods often rely on complex free-space optics, limiting integration with fiber-laser systems.

    Purpose of the Study:

    • To demonstrate a novel difference frequency generation (DFG) scheme for CEO phase self-stabilization.
    • To develop a compact and robust fiber-laser-based system for generating stabilized optical pulses.

    Main Methods:

    • Utilizing the unique dispersion properties of photonic-crystal-fibers (PCFs) for efficient pulse generation.
    • Employing Cherenkov radiation in a PCF to generate short, low-noise 615-nm pulses from a mode-locked Yb-fiber laser.
    • Implementing DFG between the generated 615-nm pulses and the 1030-nm output of an Yb-fiber amplifier.

    Main Results:

    • Successful generation of 615-nm short pulses with high efficiency and low noise.
    • Demonstration of DFG to produce ~1530-nm pulses, compatible with Er-doped fiber amplifiers.
    • Potential for self-stabilization of the carrier-envelope-offset phase in a fiber-laser system.

    Conclusions:

    • The proposed DFG scheme offers a promising route towards fiber-laser-based CEO phase-stabilized sources.
    • This approach integrates nonlinear frequency conversion directly within a fiber-laser architecture.
    • The results highlight the potential for compact, robust, and versatile optical frequency standards.