Probability density of intensity fluctuations for laser beams disturbed by turbulent aero-engine exhaust
2007
In this paper we analyze some results of natural and numerical experiments on probability density of intensity
fluctuations on an axis for 1,06 microns and 0,53 microns laser beams in comparison with theoretical dependences
(lognormal, exponential and K-distribution). Beams were propagated in aviation engine exhaust at various angles
between the jet and beam axes. It has been shown that for a beam with a wavelength of 0,53 microns experimental data
can be approximated as exponential and K-distribution, while for radiation with a wavelength of 1,06 microns good
conformity to K-distribution has been observed.
Optimum conditions for image registration with CCD-cameras of laser beams distorted by turbulence have been
chosen. For this purpose transfer characteristics of several same type samples of CCD-cameras have been studied at
various irradiation modes and registration tunings. It has been shown that the dynamic range of the cameras is used to
maximum capacity for image recording when gamma-correction is applied.
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