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Laser transmission through thin cirrus clouds.

K N Liou, Y Takano, S C Ou

    Applied Optics
    |March 20, 2008
    PubMed
    Summary
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    A new model simulates near-infrared laser transmission through thin cirrus clouds for aircraft-target systems. Horizontal ice crystal orientation can enhance laser transmission, but it depends heavily on distance and cloud optical depth.

    Area of Science:

    • Atmospheric optics
    • Remote sensing
    • Laser physics

    Background:

    • Thin cirrus clouds significantly impact near-infrared (NIR) laser propagation.
    • Accurate modeling of laser transmission is crucial for airborne tactical applications.
    • Multiple scattering effects in clouds require sophisticated modeling approaches.

    Purpose of the Study:

    • To develop a near-infrared airborne-laser transmission model for thin cirrus clouds.
    • To account for multiple scattering by randomly and horizontally oriented ice crystals.
    • To investigate the influence of various parameters on laser transmission in an aircraft-target system.

    Main Methods:

    • Developed a laser transmission model based on the successive-order-of-scattering approach.
    • Formulated direct transmission and multiple scattering for a specific aircraft-target geometry.

    Related Experiment Videos

  • Included scattering and absorption by aerosols, water vapor, and air.
  • Conducted sensitivity experiments varying aircraft-target position, cloud optical depth, and ice crystal size.

    • Main Results:

    • Transmission contributions from scattering orders higher than 1 were found to be negligible.
    • Horizontal orientation of ice crystals can enhance laser beam transmission.
    • Transmitted energy is highly dependent on the horizontal distance between aircraft and target.
    • Cloud optical depth and relative position (above/below aircraft) significantly affect transmission.

    Conclusions:

    • The developed model accurately simulates NIR laser transmission through thin cirrus clouds.
    • Higher-order scattering effects can be neglected in this specific geometry.
    • Ice crystal orientation and cloud properties are critical factors for airborne laser applications.