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

• Main Authors: DIETRICH CHRISTOPH, THOMANN ROBERT, NOEHTE STEFFEN, LEIBER JOERN, STADLER STEFAN
• Format: Patent
• Language: English
• Published: 04.11.2008
• Subjects: APPARATUS SPECIALLY ADAPTED THEREFOR; CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROTHERAPY; HOLOGRAPHIC PROCESSES OR APPARATUS; HOLOGRAPHY; HUMAN NECESSITIES; HYGIENE; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MAGNETOTHERAPY; MATERIALS THEREFOR; MEDICAL OR VETERINARY SCIENCE; ORIGINALS THEREFOR; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICS; RADIATION THERAPY; ULTRASOUND THERAPY

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.