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This article describes a laser system in which the astigmatismof laser beam is corrected by positioning a parallel glass plate into th e optical path of the laser beam.
English (United States)
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Laser Astigmatism Compensation System
This article describes a laser system in which the astigmatismof laser beam
is corrected by positioning a parallel glass plate into th e optical path of the
Laser 1 emits a light beam 2 having some astigmatism. A parallel glass plate
3 positioned at an appropriate angle from the perpendicu- lar to the beam axis of
propagation for a given thickness and index of refraction will create an
astigmatism equal and opposite to that o f the beam as it comes from the
The astigmatism of non-parallel light through a plane parallel plate is given
by: where WP is the difference between the sagittal and tangential focal
surfaces, Up is the tilt of the plate, t is the thickness of the plate, and N is the
index of refraction of the plate.