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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Wave summation
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Related Experiment Video

Updated: Jun 22, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

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Published on: November 22, 2019

Pulse interactions in the stretched-pulse fiber laser.

V Roy, M Olivier, M Piché

    Optics Express
    |June 9, 2009
    PubMed
    Summary

    Fiber laser pulse collisions were studied experimentally. Researchers found that pulse interactions can alter pulse number and speed, with a new interaction mechanism proposed.

    Area of Science:

    • Nonlinear optics
    • Fiber laser physics

    Background:

    • Stretched-pulse fiber lasers support complex pulse dynamics.
    • Understanding pulse interactions is crucial for laser stability and control.

    Purpose of the Study:

    • To experimentally investigate the outcomes of collisions between two-pulse bound states and single pulses.
    • To elucidate the mechanisms governing these pulse interactions.

    Main Methods:

    • Experimental examination of pulse collisions in a stretched-pulse fiber laser.
    • Analysis of changes in pulse characteristics during and after collision.

    Main Results:

    • Observed scenarios are explained by modifications to the pulse bound state.
    • Demonstrated that relative speed and pulse number are not conserved during collisions.

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    Last Updated: Jun 22, 2026

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  • Identified a mechanism explaining interactions among colliding pulses.

    • Conclusions:

    • Pulse bound state evolution dictates collision outcomes.
    • Collisions can lead to non-conservation of pulse number and speed.
    • A novel interaction mechanism provides insight into pulse dynamics.