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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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Updated: Jun 16, 2026

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

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Published on: February 28, 2016

Selection of cw Mode-Locked Laser Pulses.

V J Corcoran, R W McMillan, P M Rushworth

    Applied Optics
    |February 6, 2010
    PubMed
    Summary

    A new compact device can select individual pulses from a continuous wave mode-locked pulse train. This pulse selector allows for the isolation of single, repetitive, or random pulses for various applications.

    Area of Science:

    • Optics and Photonics
    • Laser Technology

    Background:

    • Mode-locked lasers generate high-repetition-rate pulse trains.
    • Selecting specific pulses from these trains is crucial for many applications.
    • Existing methods may lack compactness or flexibility.

    Purpose of the Study:

    • To describe a novel compact device for pulse selection from a continuous wave mode-locked pulse train.
    • To demonstrate the device's capability in selecting single, repetitive, or random pulses.

    Main Methods:

    • Development of a compact pulse selection apparatus.
    • Integration with a continuous wave mode-locked laser source.
    • Experimental validation of pulse selection modes.

    Main Results:

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    Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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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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    • Successful demonstration of a compact pulse selection device.
    • Capability to isolate single pulses.
    • Ability to select repetitive or random pulse sequences.
    • Experimental test results confirm device performance.

    Conclusions:

    • The described compact device offers a versatile solution for pulse selection.
    • Enables precise control over pulse extraction from mode-locked lasers.
    • Potential applications in spectroscopy, optical communications, and material processing.