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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Transmission at lambda = 10.6-mum wavelength through the upper atmosphere.

D H Douglas-Hamilton

    Applied Optics
    |March 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Atmospheric bleaching of carbon dioxide (CO(2)) laser beams is modeled. At high intensities, thermal blooming is significantly reduced by bleached absorption, improving beam propagation.

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    Area of Science:

    • Atmospheric optics
    • Laser physics
    • Chemical kinetics

    Background:

    • Carbon dioxide (CO(2)) lasers are used in various applications.
    • Atmospheric propagation of high-intensity laser beams can be affected by thermal blooming.
    • Understanding absorption dynamics is crucial for predicting laser beam behavior.

    Purpose of the Study:

    • To develop an analytic model for atmospheric bleaching at 10.6 micrometer wavelength.
    • To investigate the impact of the CO(2)-N(2)-H(2)O system on laser absorption.
    • To analyze the propagation of upward-directed CO(2) laser beams.

    Main Methods:

    • Derivation of an analytic model from kinetic equations.
    • Analysis of the CO(2)-N(2)-H(2)O system.
    • Calculation of local absorptance and total absorption along the beam path.

    Main Results:

    • The model quanties absorption in the CO(2)-N(2)-H(2)O atmosphere.
    • Calculated values for local and integrated absorption are provided.
    • At intensities of 10(6)-10(7) W cm(-2), significant reduction in thermal blooming was observed.

    Conclusions:

    • Bleached absorption effectively mitigates thermal blooming for high-intensity CO(2) laser beams.
    • The developed analytic model provides insights into atmospheric laser propagation.
    • This research is relevant for applications requiring long-range laser transmission.