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.
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.
An overview of the InPhase Technologies holographic demonstration platform is reviewed and a new holographic multiplexing technique presented. The platform is a compact, mobile system and the first fully functional, portable; holographic recordable drive complete with custom optics and control and channel electronics. In addition a description of "POLYTOPIC MULTIPLEXING" is presented. This innovation allows us to simplify the system geometry and optimize the media usage enabling a sustainable product road map. These developments pave the way for the commercialization of this technology.
KEYWORDS: Diffraction, Refractive index, Holograms, Holography, Digital holography, Data storage, Multiplexing, Semiconductor lasers, High dynamic range imaging, Photopolymer media
We report new photopolymer media for holographic data storage (HDS) at blue wavelengths (~ 405 nm), which show great promise for a practical HDS system.
An easily fabricated organic holographic media is presented that is rewriteable, sensitive to 407nm light, and that exhibits high storage capacity, sensitivity, and environmental robustness.
KEYWORDS: Diffraction, Holograms, Holography, Digital holography, Data storage, Chemistry, Multiplexing, High dynamic range imaging, Volume holography, Holographic materials
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.
Proc. SPIE. 5005, Practical Holography XVII and Holographic Materials IX
KEYWORDS: Diffraction, Holograms, Holography, Digital holography, Data storage, Chemistry, Multiplexing, High dynamic range imaging, Volume holography, Holographic materials
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.
Proc. SPIE. 3468, Advanced Optical Memories and Interfaces to Computer Storage
KEYWORDS: Refractive index, Holograms, Holography, Digital holography, Data storage, Multiplexing, CCD cameras, Optical storage, Holographic data storage systems, Photopolymer media
We report on the holographic storage and recovery of multiple high capacity (800 X 600, 480 kbit) data pages in 250 micrometer and 500 micrometer thick photopolymer media. The data pages were recovered with raw bit error rates less than 5 X 10-3, the level correctable by current error correction strategies. Our results demonstrate that photopolymer systems can be fabricated with the optical quality and low level of scatter required for digital data storage.
KEYWORDS: Refractive index, Holograms, Holography, Digital photography, Digital holography, Data storage, Polymerization, Photopolymers, Holographic data storage systems, Photopolymer media
We report on the holographic storage of multiple digital data pages in photopolymer media. The results demonstrate the potential of these materials for high density data storage.
Proc. SPIE. 2547, Laser Techniques for Surface Science II
KEYWORDS: Quantum wells, Diffusion, Electroluminescence, Near field scanning optical microscopy, Near field, Surface properties, Laser damage threshold, Spatial resolution, Laser optics, Near field optics
Near-field scattering optical microscopy (NSOM) is used to characterize the emission output and to obtain photoconductivity maps of InGaAsP multiple quantum well lasers. The high spatial resolution of NSOM (approximately (lambda) /20) allows detailed imaging of the laser structure. Emission measurements not only provide direct visualization of the laser mode but also reveal unwanted emission due to InP electroluminescence. Near-field photoconductivity experiments yield high resolution measurement of carrier transport throughout the structure yielding valuable information on current leakage, defect formation, and the quality of p-n junctions.
KEYWORDS: Refractive index, Channel waveguides, Waveguides, Cladding, Chemical vapor deposition, Near field scanning optical microscopy, Profiling, Spatial resolution, Phosphosilicate glass, Near field optics
The refractive index profile of a straight channel phosphosilicate glass planar optical waveguide is obtained with high spatial resolution (approximately 0.25 micrometers ) using near- field scanning optical microscopy (NSOM). The optical intensity profile of the waveguide mode is measured by NSOM and the refractive index distribution is calculated from the measured intensity. The calculated refractive index distribution is in agreement with that expected from the fabrication procedure and provides evidence for phosphorous diffusion between the core and cladding regions.
The polar low frequency vibrational and relaxational modes crucial to understanding the structure and phase transitions of ferroelectric perovskite crystals are examined using impulsive stimulated Raman scattering (ISRS). At wavevectors near the Brillouin zone center, these modes are strongly coupled to light, and the pure optic mode behavior is deduced from the wavevector dependence of the mixed phonon-polaritons.
Vibrational energy relaxation of the symmetric C-H stretching mode of methyl thiolate on a Ag(l 1 1) surface is measured by picosecond infrared-visible sum frequency generation. Vibrational relaxation lifetime components of ~3 PS and 63 PS are observed at 300 K. The long lifetime component shows a moderate temperature dependence. Both population relaxation components are assigned to intramolecular energy transfer on the basis of comparisons with other measurements and the predicted temperature dependence of intramolecular relaxation rates. Direct energy transfer to electronic or vibrational degrees of freedom in the substrate is not found to be important for this vibrational mode.
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