Scintillation Measurements of Broadband 980nm Laser Light in Clear Air Turbulence
JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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Intensity scintillation variances and intensity probability density functions PDF were experimentally measured for broad-band 2nm, 980 nm laser light reflected by two corner-cube retro-reflectors as a function of retro-reflector lateral spacing over a short 75 m atmospheric optical path. The PDFs transitioned from broad double peaked beta shaped densities to log-normal ones as the retro-reflector spacing was increased to exceed the optical field lateral coherence length. Specific spacing for a given average atmospheric refractive index structure constant Cn2 eliminated coherent interference between light beams returned by each retro-reflector.
- Statistics and Probability