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Estimating the turbulence profile with differential scintillations measured by a Shack-Hartmann wave front sensor

An implementation of differential scintillations to characterize the C2n(z) profile along a nearly horizontal propagation path measured by a Shack-Hartmann wavefront sensor is developed and demonstrated. Measurements from a Small Mobile Atmospheric Sensing Hartmann (SMASH) instrument using an LED source to characterize 500 m, 1 km and 2 km paths at the Environmental Laser Test Facility (ELTF) are presented.