Abstract
AbstractThe conventional feedback of multidither outgoing -wave adaptive optical systems isinoperative in the presence of a featureless target resolved by the transmitting optics.This paper proposes to define an artificial glint by imaging the target laser pattern on apinhole aperture. The concept is somewhat obvious but, in turbulence, the existing theoryon resolution and coherence states that it is restricted to small scintillation strength.It is shown, through correlation measurements between the target irradiance and theartifificial -glint irradiance, that the range of validity is much broader than predicted.Operational tests with a two -degree -of- freedom system demonstrate that the artificial -glint technique allows effective tracking and tilt compensation at propagation distancesreaching far into the scintillation- saturation region, in disagreement with recentmodels.IntroductionThe propagation characteristics of optical beams in the earth's atmosphere are greatlyaffected by the random fluctuations of the refractive index produced by the air turbulen-
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