Beam expanding lens

Details Beam expanding lens Beam expanding lens

1994-05-16

1996-06-04

Epps, Georgia Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359625, 359831, G02B 306

Patent

active

055238890

ABSTRACT:
A new type of optical element for diverging a laser beam in several directions, for example to produce a relatively uniform cross, has a number of cylindrical segments. Each segment has at least two surfaces, a primary and a secondary surface. The primary surface has a relatively sharp apex and is shaped to conform to a curve defined in a (x,y,z) cartesian coordinate system by the equation ##EQU1## where z and y are independent of x, c is the curvature at the apex and Q is the conic constant which is less than -1.
The element is useful e.g. for precision alignment.

REFERENCES:
patent: 3535025 (1970-10-01), Shannon
patent: 4826299 (1989-05-01), Powell
patent: 5123722 (1992-06-01), Meymand

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