Lisa Dhar

Holographic data storage media for practical systems

Holographic data storage (HDS), which makes use of the full volume of the recording medium, possesses high potential by promising fast transfer rates of hundreds of Megabytes/sec and storage densities greater than 200 Gbytes per 120mm disk. The restrictions that are placed on the holographic media, however, are stringent. Described here is a high performance photopolymer based medium that has the properties necessary to enable this technology. Through the use of several different holographic techniques, the material characteristics that are necessary for holographic storage products may be determined. The two different systems that are discussed here include Plane Wave and Digital Holographic Data Storage. These measured characteristics include high dynamic range (M/#), sensitivity, and small recording-induced Bragg detuning. In addition, results of archival and shelf-life environmental testing of the media will be discussed.

Photopolymer media for holographic storage at ∼ 405 nm

We report new photopolymer media for holographic data storage (HDS) that are photosensitive to laser wavelengths from 400-410 nm. The media possess high dynamic range and photosensitivity, low shrinkage, and good archival and shelf-life stability, which show great promise for a practical HDS system.

Progress toward the commercial realization of high performance holographic data storage: architecture and function of the InPhase Technologies holographic drive

The promise of using volume holography to deliver high performance optical storage systems is at hand. The possibility of extremely large storage capacities and fast transfer rates make holographic storage ideal for high performance video applications. An overview of advances at InPhase Technologies toward the first drive product is presented. InPhase Technologies is developing a holographic recordable optical drive and associated disk media for professional archive applications. The target user capacity for the first product is 300GB of user data with sustained write and read user transfer rates of 20MByte/s. The architecture, design and implementation of the holographic drive are described here.

Blue-sensitive rewriteable holographic media

An easily fabricated organic holographic media is presented that is rewriteable, sensitive to 407-nm light, and that exhibits high storage capacity, photosensitivity, and environmental robustness. Data written in this media is nonvolatile to readout with the blue write beam, and is only erased by irradiation with UV light. Over 50 holographic write/erase cycles have been demonstrated to date

Photopolymer use for holographic data storage

Holographic data storage (HDS), which makes use of the full volume of the recording medium, possesses high potential by promising fast transfer rates of hundreds of Megabytes/sec and storage densities greater than 200 Gbytes per 120mm disk. The restrictions that are placed on the holographic media, however, are stringent. Described here is a high performance photopolymer based medium that has the properties necessary to enable this technology. Through the use of several different holographic techniques, the material characteristics that are necessary for holographic storage products may be determined. The two different systems that are discussed here include Plane Wave and Digital Holographic Data Storage. These measured characteristics include high dynamic range (M/#), sensitivity, and small recording-induced Bragg detuning. In addition, results of archival and shelf-life environmental testing of the media will be discussed.

Optical Holographic Data Storage

Holography is a compelling choice for next-generation data storage needs. It enables storage densities and data transfer rates beyond the current optical technologies. Holography can surpass the storage densities of traditional optical recording because it goes beyond the two-dimensional approaches to write data in three dimensions. In addition, unlike conventional technologies that record and recover digital data serially, holography allows the reading and writing of millions of bits of data with a single pulse of light, enabling data transfer rates of billions of bits per second.

Progress toward the commercial realization of high performance holographic data storage

The promise of using volume holography to deliver high performance optical storage systems is at hand. The possibility of extremely large storage capacities and fast transfer rates make holographic storage ideal for high performance video applications. An overview of advances at InPhase Technologies is presented. Progress toward high-density implementations as well as the development of a functional prototype is presented. These systems are the first fully functional holographic recordable drives developed. Their development paves the way for the commercialization of this technology.

Red-Sensitive Holographic Recording Media

A media is presented that allows for holographic data storage at red wavelengths. The newly developed media has low scatter, low shrinkage upon recording, high dynamic range, good sensitivity, good shelf life, and good archival.