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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.
Rectangular and Triangular Pulse Function01:19

Rectangular and Triangular Pulse Function

The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,

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Related Experiment Video

Updated: Jun 16, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
11:20

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Pulse shape generator for laser fusion.

C E Thomas, L D Siebert

    Applied Optics
    |February 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel pulse stacker generates precisely shaped, short laser pulses for optimal fuel pellet implosion in laser fusion experiments. This technology enables varied pulse widths and shapes, crucial for advancing fusion energy research.

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    Last Updated: Jun 16, 2026

    Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

    Area of Science:

    • Physics
    • Fusion Energy
    • Laser Technology

    Background:

    • Laser-driven inertial confinement fusion requires precisely shaped, short laser pulses for efficient fuel pellet implosion.
    • Existing electro-optic shutters are too slow for generating the desired picosecond pulse widths and shapes.

    Purpose of the Study:

    • To develop a versatile device capable of generating a wide range of laser pulse shapes and widths.
    • To overcome the limitations of existing pulse-shaping technologies for laser fusion applications.

    Main Methods:

    • Utilizing a pulse stacker that combines multiple 30-picosecond mode-locked laser pulses.
    • Implementing the pulse stacker within the KMS Fusion neodymium-doped-glass laser system.

    Main Results:

    • The developed pulse stacker successfully generates varied pulse shapes and widths.
    • The system has been instrumental in producing over 500 neutron-yielding shots in fusion experiments.

    Conclusions:

    • The versatile pulse stacker is a key enabling technology for advanced laser fusion experiments.
    • This method allows for tailored laser pulse characteristics, optimizing the heating and compression of fusion fuel targets.