Effects of Atmospheric Turbulence on the Transmission of a Laser Beam at 6328 Å II–Frequency Spectra

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Abstract
The frequency spectra of light intensity fluctuations of a laser beam by atmospheric turbulence were investigated using a He–Ne gas laser at 6328 Å with a beam diameter of about 3.5 mm and optical path length of L = 4.5 km and 14.5 km. The normalized spectra U(f) were not systematically affected by different receiving aperture diameters 5 mm ≤ D ≤ 80 mm, probably because of the small diameter of the output aperture of the source. The theoretical relation fc∝L-12, where fc is a characteristic frequency of U(f), does not appear to hold empirically.

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