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Laser self-focusing in the atmosphere.

R I Miller, T G Roberts

    Applied Optics
    |June 5, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Self-focusing of laser beams in the atmosphere is explored. Atmospheric effects like density variations and air breakdown limit self-focusing, but specific laser pulse parameters show potential for this phenomenon.

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    Area of Science:

    • Optics
    • Atmospheric Physics
    • Nonlinear Optics

    Background:

    • Self-focusing is a nonlinear optical phenomenon where a beam of light can focus itself.
    • Atmospheric propagation introduces complexities such as density variations and absorption.
    • High-intensity lasers can induce air breakdown, limiting nonlinear effects.

    Purpose of the Study:

    • To investigate the applicability of self-focusing theory to laser beams in the atmosphere.
    • To estimate the impact of atmospheric conditions on self-focusing.
    • To determine the laser pulse parameters conducive to atmospheric self-focusing.

    Main Methods:

    • Application of self-focusing theory to atmospheric conditions.
    • Estimation of limiting effects: density variation, absorption, and air breakdown.

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  • Analysis of power-driven instabilities.

    • Main Results:

    • Atmospheric density variations, absorption, and air breakdown were found to limit self-focusing.
    • Laser pulses with durations between 10 nanoseconds and 10 microseconds were considered.
    • Powers ranging from 100 to 1000 times the critical power (P(c)) showed potential for self-focusing.

    Conclusions:

    • Self-focusing of laser beams in the atmosphere is feasible under specific conditions.
    • The critical power (P(c)) is defined for an ideal, non-attenuating medium.
    • Optimal laser pulse parameters (10 ns-10 µs, 10^2-10^3 P(c)) exist for atmospheric self-focusing.