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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Collapse of optical pulses.

Y Silberberg

    Optics Letters
    |September 23, 2009
    PubMed
    Summary

    Optical pulses can collapse in time and space due to combined physical effects, potentially creating intense ultrashort pulses or stable light bullets. Conditions for this phenomenon and experimental possibilities are explored.

    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Theoretical physics

    Background:

    • Optical pulses are subject to various physical phenomena during propagation.
    • Understanding pulse behavior is crucial for advancements in optical technologies.

    Purpose of the Study:

    • To investigate the simultaneous collapse of optical pulses in both time and space.
    • To explore the formation of ultrashort pulses with high optical fields.
    • To discuss the possibility of generating stable light bullets.

    Main Methods:

    • Theoretical analysis of pulse propagation dynamics.
    • Consideration of combined effects: diffraction, anomalous dispersion, and nonlinear refraction.

    Main Results:

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    Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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  • Demonstrated that optical pulses can collapse simultaneously in time and space.
  • Identified conditions leading to ultrashort pulse generation with extremely large optical fields.
  • Showcased the potential for forming stable light bullets.

    • Conclusions:

    • The combined effects of diffraction, anomalous dispersion, and nonlinear refraction enable optical pulse collapse.
    • This collapse offers a pathway to generating high-intensity ultrashort pulses and stable light bullets.
    • The study outlines conditions and discusses experimental feasibility.