1978-10-12
1980-06-03
Henry, Jon W.
350 55, G02B 1706
Patent
active
042059020
ABSTRACT:
An inexpensive laser beam expander including a first mirror system comprising an off axis section of a Schwarzschild telescope system with a first, convex spherical mirror and a second, concave spherical mirror, having a first common center of curvature, the input laser beam being incident on the first mirror and reflected therefrom to the second mirror, the second mirror forming a real image at a first image point; and a second mirror system comprising a backwards Schwarzschild telescope system including a third, convex mirror and a fourth, concave mirror, having a second common center of curvature, the second system being such that parallel incident light striking the fourth concave mirror and reflected to the third convex mirror will form a virtual image behind the third convex mirror at a second image point, the second system disposed so that the second image point coincides with the first image point whereby the third convex mirror intersects the light reflected from the second concave mirror and reflects it to the fourth concave mirror, the fourth concave mirror providing a collimated output beam which is expanded.
REFERENCES:
patent: 2970518 (1961-02-01), Ross
patent: 3674334 (1972-07-01), Offner
patent: 3748015 (1973-07-01), Offner
patent: 3811749 (1974-05-01), Abel
Giarratana Salvatore A.
Grimes Edwin T.
Henry Jon W.
Masselle Francis L.
The Perkin-Elmer Corporation
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