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Related Concept Videos

Self-Locking Screw01:16

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
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Modes of Standing Waves - I01:03

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
Modes of Standing Waves: II01:04

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Solenoids01:17

Solenoids

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Forced Oscillations

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Related Experiment Video

Updated: Jun 19, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Asynchronous soliton mode locking.

C R Doerr, H A Haus, E P Ippen

    Optics Letters
    |October 27, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel fiber laser using asynchronous phase modulation for stable, high-repetition-rate picosecond soliton generation. This method eliminates the need for precise modulator frequency control, simplifying laser operation.

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    Published on: February 28, 2016

    Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
    07:42

    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

    Published on: December 15, 2021

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Fiber Optics

    Background:

    • Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
    • Achieving stable, high-repetition-rate operation often requires complex stabilization techniques.
    • Erbium-doped fiber lasers are widely used for generating pulses in the 1.55 µm spectral region.

    Purpose of the Study:

    • To report a harmonically mode-locked erbium-doped fiber ring laser.
    • To demonstrate the use of asynchronous phase modulation for pulse generation and stabilization.
    • To achieve steady-state operation of picosecond solitons at a 1 GHz repetition rate.

    Main Methods:

    • Utilized an erbium-doped fiber ring laser cavity.
    • Implemented a phase modulator operating asynchronously with the generated pulses.
    • Employed the asynchronous phase modulation for pulse start-up and background cleanup.
    • Leveraged this technique for a novel form of pulse timing stabilization.

    Main Results:

    • Successfully generated short solitons.
    • Achieved stable, harmonically mode-locked operation at a 1 GHz repetition rate.
    • Demonstrated steady-state operation of picosecond solitons.
    • Eliminated the need for modulator drive frequency stabilization.

    Conclusions:

    • Asynchronous phase modulation is an effective technique for stabilizing mode-locked fiber lasers.
    • This method simplifies laser design and operation by removing the requirement for frequency stabilization.
    • The developed laser offers a robust platform for generating high-repetition-rate picosecond solitons.