Method and apparatus for providing astigmatism-reduced images wi

Details Method and apparatus for providing astigmatism-reduced images wi Method and apparatus for providing astigmatism-reduced images wi

1995-02-21

1996-11-26

McGraw, Vincent P.

Optics: measuring and testing

By light interference

Having shearing

G01J 328

Patent

active

055791069

ABSTRACT:
An apparatus for providing an astigmatically-reduced image with a spectroscopic instrument is disclosed which comprises a collimator which collimates electromagnetic radiation; a cylindrical mirror which receives and reflects the collimated electromagnetic radiation; a diffractor having a surface with a plurality of diffraction rulings inscribed thereon for diffracting electromagnetic radiation directed from the collimator; and a focuser which collects, focuses and directs diffracted electromagnetic radiation and directs it towards an exit aperture. In the preferred embodiment, the cylindrical mirror comprises a concave cylindrical mirror positioned such that the cylindrical axis is substantially normal to rulings on the diffractor. In another preferred embodiment, the cylindrical mirror is convex and is positioned such that the cylindrical axis is substantially parallel to rulings on the diffractor.

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