Lithograph with beam guidance and method of producing digital holograms in a storage medium

US7445873B2 · kind B2 · utility

Assignee

• TESA SCRIBOS GMBH · DE

Inventors

• Steffen Noehte · Weinheim, DE
• Christoph Dietrich · Herborn, DE
• Robert Thomann · Heidelberg, DE
• Stefan Stadler · Hamburg, DE
• Jorn Leiber · Hamburg, DE

Key dates

• Filing date: Mar 28, 2002
• Grant date: Nov 4, 2008
• Expiry date: Nov 8, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2260/63
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Producing a digital hologram-in a storage medium includes: (i) focusing a write beam onto the storage medium; (ii) moving the write beam two-dimensionally relative to the storage medium; (iii) focusing a scanning beam onto a beam-guiding mask having a plurality of tracks; (iv) moving the scanning beam two-dimensionally relative to the mask, the movement of the scanning beam being coupled with the movement of the write beam; (v) generating a position control signal when the position of the scanning beam deviates from the scanned track by a predefined value; (vi) controlling the position of the write beam on the storage medium with the aid of the position control signal; and (vii) writing the hologram by introducing radiation energy point by point, the intensity of the write beam being controlled as a function of the position of the write beam on the storage medium.