Quantization of Scattering of Laser Beams. Window and Atmospheric Scattering at 1.06micrometers.

摘要

A laser beam propagating through the atmosphere from a transmitter can be observed at various aspect angles because of scattering by the exit window of the transmitter and by particles in the atmosphere. The objective of this contract was to provide quantitative values for both types of scattering at the 1.06micrometer laser wavelength. The contractual effort was conveniently divided into two tasks:Task (1) -Measure the laser beam scattering for a set of five different window materials under these conditions:clean,or dirty with small amounts of water,dust,and fingerprints (oil),or cleaned,as would be done by a laser operator in the field;Task (2) -Calculate the laser beam scattering for a standard clear and a standard hazy atmosphere as functions of polarization and receiver position for receiver fields of view of 300, 100, 30,and 1 mr. Procedures used are discussed,the results of the measurements and calculations are given in graphic form and a brief comparison of window and atmospheric scattering is presented along with conclusions and recommendations.