Abstract
We describe an aberration of a double-focus lens made of a uniaxial crystal with the optic axis perpendicular to the optical axis of the lens. One of the focal points of the lens is formed by ordinary rays in the crystal, and the other is formed by extraordinary rays. The extraordinary rays have astigmatism at the focal point owing to birefringence of the crystal even under the paraxial condition. The magnitude of the aberration depends on the lens thickness and the ratio of the principal refractive indices.
© 1992 Optical Society of America
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