Abstract
We show how the technique of astronomical speckle holography is dependent upon the degree of isoplanicity between the object and the discrete point source. A well calibrated measurement of the degree of correlation between two quasi-instantaneous simultaneous point source speckle patterns ( separation = 2.6″) are presented to illustrate this non-isoplanatic effect as a function of the spatial frequency. This two-dimensional measurement is in qualitative agreement with previously computed models and shows a high degree of correlation at seeing dominated frequencies with a severe attenuation (but not total loss of correlation) for frequencies approaching the diffraction limit. We show how such measurements may be used to reweight (calibrate) the Fourier amplitude of a speckle holographic image observed under similar seeing conditions in order to compensate for the non-isoplanatic degradation at high spatial frequencies.
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