Diffractive optical elements

Details Diffractive optical elements Diffractive optical elements

1997-01-24

1999-08-17

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

264 132, 264 133, 264 136, 264 27, B29D 1100

Patent

active

059389893

ABSTRACT:
A method for the replication of diffractive optical elements using audio/video disc manufacturing equipment and processes. The audio/video disc manufacturing process and mold mastering tooling create diffractive optical elements using a mold plate. The diffractive optic design and photomasks are first fabricated then replicated using compact disc industry mold mastering techniques. The surface relief pattern is produced centered in the plate using ion milling or refractive ion etching photolithographic fabrication techniques. Once patterned, the mold master plate is punched into a circular form consistent with standard compact or video disc mold bases--typically eight inches for a compact disc. After molding, each element can be cut out of the disc using blade, shear, waterjet or laser cutting.

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