Beam Spread Induced by Atmospheric Turbulence in a Folded Path

摘要

On the basis of extended Huygens-Fresnel principle and quadratic approximation,general expressions of the beam spread reflected from a target in a turbulent atmosphere are derived. The properties of reflected beam spread are investigated. It is found that there exist amplification and self compensation of beam spread in the reflection from a mirror and a corner cube reflector, respectively. Calculations show that the spread can be reduced by using a long-wavelength laser as well as large transmitting and reflection radii.