Abstract
The inhomogeneous distribution of brightness in a split-element filter is
discussed. This inhomogeneity is caused by the off-axis effect of the
birefringent crystal and can seriously affect astronomical observations in the
case of a large field of view. For example, the maximal brightness fluctuation
is ∼9.44% in a full-disk solar telescope whose maximal incident
angle is 70 arcmin. We also discuss ways to avoid this
disadvantage.
© 1997 Optical Society of America
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