Segmented mirrors for atmospheric compensation
1990
An optical wavefront propagating through the atmosphere will
be perturbed by local variations in the refractive index ofthe atmospheric
gases. When accumulated over long optical path distances they will impart
a spatial and temporally random distortion to the wavefront. These distortions
have a characteristic spatial coherence length r0 and an atmospheric
decorrelation time ?0. In directed energy applications, atmospheric
distortions can reduce the peak target energy densities of larger diameter
laser beams by orders of magnitude. The problem is not solved through
the use of larger apertures; once the aperture size increases beyond one
or two r0, the far-field spot remains constant in size. Hence, for large
aperture systems, the overall performance is set by the spatial coherence
of the atmosphere and not by the system's exit pupil.
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