Siros Technologies, Inc.

Landauer, Incorporated

Sergei Orlov

Lambertus Hesselink

Sergei L Sochava

Matthew Charles Bashaw

Brian H Cumpston

Tokuyuki Honda

Ray Snyder

Anna Akselrod

An apparatus and method for optical data storage and/or retrieval using an optical data storage medium having a spatially-modulated refractive index that can be altered locally with optical methods. Data can be written at a plurality of depths throughout the volume of the medium using a write beam and relatively simple and inexpensive optical components. The write beam stores data locally by physical distortion of the medium at discrete storage locations. The alterations can be detected as variations in the reflectivity of the storage locations using a retrieval beam.

Method and apparatus for optical data storage and/or retrieval by selective alteration of a holographic storage medium

A holographic storage and retrieval system for use in co-propagating or counter-propagating geometries having a common optical relay for guiding a signal beam and a reference beam along a common optical axis to a holographic medium to write a hologram therein. The optical relay has an object region imaging quality such that at least 65% and preferably at least 80% of the nominal luminous energy from object pixels is encompassed or 'ensquared' by the corresponding image pixels. Additionally, the optical relay has a high total numerical aperture (N.A.) of about 0.83, a pixel N.A. of approximately 0.04 for the signal beam. The system of the invention can be used with holographic storage media in the form of disks, tapes or bulk holographic crystals.

Optical relay for pixel-based holographic storage and retrieval

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Mountain View, CA, United States of America

Sergei Orlov