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Carrier-envelope phase-stable spatiotemporal light bullets.

I Gražulevičiūtė, R Šuminas, G Tamošauskas

    Optics Letters
    |August 15, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Intense laser pulses self-focus and form light bullets in fused silica. These bullets split at higher power but maintain stable phase, offering insights into nonlinear optics.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Investigating intense laser pulse propagation in optical materials is crucial for understanding nonlinear phenomena.
    • Self-focusing and filamentation are key processes in high-intensity laser-matter interactions.
    • Carrier-envelope phase stability is vital for precise control of ultrashort laser pulses.

    Purpose of the Study:

    • To experimentally investigate the self-focusing and filamentation of intense, phase-stable laser pulses in fused silica.
    • To analyze the spectral broadening dynamics and their relation to spatiotemporal light bullet formation.
    • To examine the behavior of light bullets, including splitting and phase stability, under varying input power.

    Main Methods:

    • Utilized 90 fs, 1.8 μm carrier-envelope phase-stable laser pulses.
    • Employed spectral measurements in a wedge-shaped fused silica sample.
    • Applied a three-dimensional imaging technique to characterize spatiotemporal light bullets.
    • Conducted f-2f interferometric measurements to verify carrier-envelope phase stability.

    Main Results:

    • Observed detailed spectral broadening, including third-harmonic and resonant radiation, as a function of propagation distance.
    • Linked spectral dynamics to the formation and propagation of spatiotemporal light bullets.
    • Demonstrated light bullet splitting into two distinct bullets with different group velocities at higher input power.
    • Confirmed stable carrier-envelope phase of light bullets, even after splitting.

    Conclusions:

    • Spatiotemporal light bullets play a critical role in the spectral broadening of intense laser pulses in fused silica.
    • Light bullet splitting is a power-dependent phenomenon that preserves their unique spatiotemporal intensity profiles.
    • The stable carrier-envelope phase of light bullets is robust and maintained throughout the observed propagation dynamics.