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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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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Prepulse-free, multi-terawatt, sub-30-fs laser system.

Hiromitsu Kiriyama, Norihiro Inoue, Yutaka Akahane

    Optics Express
    |June 9, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a novel laser system using optical parametric chirped pulse amplification (OPCPA) to achieve unprecedented prepulse contrast. This advancement significantly improves the quality of ultrashort laser pulses for advanced applications.

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    An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

    Published on: October 23, 2018

    Area of Science:

    • Laser Physics and Photonics
    • Ultrafast Optics
    • High-Intensity Laser Systems

    Background:

    • Ultrashort pulse lasers are crucial for various scientific fields.
    • Achieving high prepulse contrast is a persistent challenge in laser technology.
    • Existing methods often struggle to suppress unwanted prepulses effectively.

    Purpose of the Study:

    • To develop a prepulse-free, multi-terawatt ultrashort pulse laser system.
    • To significantly enhance the prepulse contrast of amplified laser pulses.
    • To achieve high energy and ultrashort pulse durations with improved contrast.

    Main Methods:

    • Integration of optical parametric chirped pulse amplification (OPCPA) with a conventional Ti:sapphire chirped pulse amplification laser chain.
    • Utilizing an OPCPA system after a regenerative amplifier to boost prepulse contrast.
    • Employing a subsequent four-pass Ti:sapphire amplifier for further energy amplification.

    Main Results:

    • Achieved a dramatic enhancement in prepulse contrast by 6 orders of magnitude.
    • Measured a prepulse contrast better than 4.4 x 10^-11 for a 24 mJ pulse.
    • Obtained a final amplified energy of 279 mJ with a 23.5 fs pulse duration, reaching 5.9 TW peak power.

    Conclusions:

    • The combined OPCPA and Ti:sapphire system effectively suppresses prepulses.
    • This laser system offers superior prepulse contrast for high-energy ultrashort pulses.
    • The developed technology advances capabilities for demanding applications in ultrafast science.