Aperture averaging of optical scintillations in CO2 DIAL
Nelson, Douglas H.
Petrin, Roger R.
Schmitt, Mark J.
Whitehead, Michael C.
Walters, Donald L.
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Atmospheric turbulence causes several effects on a propagating laser beam We have previously studied the effects of beam spreading and beam wander, and feel we have a good understanding of their impact on CO2 DIAL. Another effect is scintillation where atmospheric turbulence causes irradiance fluctuations within the envelope of the beam profile. We believe that scintillation at the target plays an important role in LIDAR return statistics. A Huygens-Fresnel wave optics computer simulation for propagating beams through atmospheric optical turbulence has been previously developed. We modify this simulation to include the effects of reflective speckle and examine its application in comparison with experimental data.
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