SCATTERING AND REFLECTANCE OF LIGHT FROM AIRBORNE LASER SYSTEMS
RADIATION RESEARCH ASSOCIATES INC FORT WORTH TX
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The LITE-I Monte Carlo program was used to predict the ground reflected and atmospheric scattered components of the scattered light from airborne laser systems received at collimated receivers located at the same altitude as the laser system and focused on the ground area illuminated by the direct radiation from the laser system. Lasers emitting light with wavelengths of 0.5145, 1.06, 3.507 and 10.6 microns were considered at different altitudes in two model atmospheres. The first atmosphere was a clear atmosphere having a ground level meteorological range of 25 km. The second atmosphere was identical to the first above 1.5 km but below 1.5 km the aerosol content was increased to reduce the ground level meteorological range to 5 km. The ground reflected component of the scattered light entering the receiver for all four wavelengths was taken to be the sum of the direct radiation incident on the ground and reflected to the receiver plus the single scattered radiation incident upon the ground area illuminated by the direct radiation and then reflected to the receiver. For the 3.507 and 10.6 micron lasers the atmospheric scattered component at the receiver in both atmospheres is composed almost entirely of single scattered light, but for the 0.5145 and 1.06 micron lasers the single scattered irradiance seriously underpredicts the atmospheric scattered component for lookangles greater than just a few degrees.
- Lasers and Masers