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COMPARISON OF UNDERWATER ATTENUATION OF LASER WITH NONLASER LIGHT.
NAVAL RESEARCH LAB WASHINGTON D C
In a cooperative effort with the U. S. Naval Ordnance Laboratory, the attenuation coefficients of filtered Potomac River water were measured for coherent and for noncoherent light. A He-Ne gas laser served as a source of coherent red light at 6330A, and a filtered, collimated, concentrated arc lamp furnished noncoherent light at 6355A red and at 5255A green. The divergence of the light beam was of the order of one milliradian in all cases, and the entire cross section of the beam was always accepted by the receiver. The attenuation of red light was measured for underwater ranges of 6 to 36 m and of green light for ranges of 6 to 122 m. No experimentally significant difference was found between the attenuation coefficients measured for coherent and noncoherent light. The value obtained at 6328A was 0.35m, and at 5255A the value was 0.097m. Author
See also AD-412 313.