Proceedings PaperSpreading Of Optical Beams Passing Through Substantial Air,Water Paths
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Experiments have been performed which measure the intensity distribution pattern of an optical beam which originates below the surface of the water. A narrow beam (5°) light source was submerged at varying depths up to 16 attenuation lengths (alpha = 2.4 m-1) and pointed in a vertical direction. An optical detector was flown through the beam at altitudes to 3000' and pointed downward at the underwater source. Data was obtained which provides plots of the optical beam intensity distribution as a function of angle. Three analytical models are presented for predicting beamwidth based on optical properties of the ocean. Comparison with the experimental results shows deficiencies in each of the models developed.