Method for recording information in an optically readable data memory

US5243589A · kind A · utility

Assignee

• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Michael Stuke · Göttingen, DE
• Horst-Christian Langowski · Hannover, DE
• Tobias Damm · Hersbruck, DE
• Stefan Preuss · Göttingen, DE

Key dates

• Filing date: Jun 5, 1992
• Grant date: Sep 7, 1993
• Expiry date: Jun 5, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/00451
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In a method for recording information in an optical data memory by surface exturing, a substrate surface is first pre-treated or sensitized by selective irradiation at relatively low fluence. For selectivity of irradiation, a mask, a holographic imaging process, or direct writing may be used. In a second step, the sensitized regions are ablated from the surface by means of spatially non-selective irradiation at a different wavelength and at relatively high fluence.