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Updated: Oct 18, 2025

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
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Laser filaments as pulsed antennas.

Aleksei M Zheltikov

    Optics Letters
    |October 1, 2021
    PubMed
    Summary

    Secondary radiation emission from laser filaments is explained by transient antenna radiation. This model accurately describes terahertz and microwave properties, explaining efficient microwave generation in experiments.

    Area of Science:

    • Physics
    • Optics
    • Electromagnetism

    Background:

    • Laser-induced filaments generate secondary radiation.
    • Understanding this emission is crucial for applications in terahertz and microwave technologies.

    Purpose of the Study:

    • To revisit secondary radiation emission from laser filaments.
    • To explain the spectral, polarization, and angular properties of emitted radiation.
    • To provide a physical explanation for efficient microwave generation.

    Main Methods:

    • Applying transient antenna radiation theory to laser filaments.
    • Analyzing time-domain pulsed-antenna characteristics.
    • Comparing theoretical predictions with experimental observations of emitted radiation.

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    Main Results:

    • Transient antenna radiation solutions accurately describe spectral and polarization properties.
    • The model explains radiation patterns and angular dispersion of terahertz and microwave emission.
    • Filament length is directly related to the low-frequency cutoff, explaining microwave generation.

    Conclusions:

    • Transient antenna radiation provides a clear physical model for laser-induced filament emission.
    • This framework enhances understanding of terahertz and microwave generation mechanisms.
    • The study clarifies the relationship between filament properties and emitted radiation characteristics.