Method and lens arrangement to improve imaging performance of mi

Details Method and lens arrangement to improve imaging performance of mi Method and lens arrangement to improve imaging performance of mi

1998-06-30

2000-05-30

Spyrou, Cassandra

Optical: systems and elements

Light interference

359620, 359667, 359900, 362259, 355 67, G02B 2700, G03B 2754

Patent

active

060697393

ABSTRACT:
A technique for introducing variable phase delay across portions of a spatially coherent light beam, such as a laser, without changing the focal length of the portions of the beam. A fly's-eye lens array is utilized to distribute the light for a more uniform illumination, but different length air gaps are introduced in the lens elements to provide a variable delay of portions of the beam. In a second scheme, a set of prisms is positioned in the path of the laser beam, in which the shape of the prism introduces variable phase delay across the cross-section of the beam.

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