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Cryogenic frequency domain optical mass memory

Gary C. Bjorklund, Wilfried Lenth, C. Ortíz

Published Dec 1, 1982• 0 citations
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Abstract

Cryogenic frequency domain optical memories based upon photochemical hole burning offer the possibility of storing data at densities of up to 10 to the 11th power bits/sq.cm. The basic principles of photochemical hole burning are reviewed. Recent results on recording materials, data reading and writing, and system configurations are presented. (Author)

Related papers

Cryogenic Frequency Domain Optical Mass Memory

Gary C. Bjorklund, Wilfried Lenth, C. Ortíz

Cryogenic frequency domain optical memories based upon photochemical hole burning offer the possibility of storing data at densities of up to 1011 bits /cm2. The basic principles of photochemical hole burning are reviewed. Recent results on recording materials, data reading and writing, and configurations are presented.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jul 30, 1982•5 citations

Reading and writing of information in a frequency domain optical memory using GaAlAs diode lasers

Peter Pokrowsky, Frank Ghu, Gary C. Bjorklund

Recently there has been considerable interest in frequency domain optical memories based on the cryogenic phenomenon of photochemical hole burning.1 This phenomenon occurs whenever persistent photochemical changes can be induced by exposure to narrowband optical radiation tuned to a frequency within the inhomogeneously broadened zero phonon line of a photoactive material contained In a host. The narrowband radiation selectively excites that fraction of molecules whose homogeneous linewidth overlaps the excitation frequency. The ensuing photochemical reaction results in a persistent narrow dip or hole in the line shape. Since typical ratios of inhomogeneous- to-homogeneous widths are of the order of 103, 103 resolvable holes can be burned into the inhomogeneous line at each spatial location in the sample. Thus the storage density in such a frequency domain optical memory might ultimately be 103 higher than in a conventional optical memory.

Conference on Lasers and Electro-Optics•Jan 1, 1983•0 citations

Reading and Writing of Photochemical Holes Using GaAIAs Diode Lasers

Peter Pokrowsky, W. E. Moerner, F. Chu +1 more

Many investigations have been done on the field of frequency domain optical memories based on photochemical hole burning (PHB). This effect offers an extra dimension for the organization of an optical memory. At cryogenic temperatures several solid state materials such as aggregate color centers in alkali halide crystals exhibit inhomogeneously broadened absorption lines. In such an absorption line permanent narrow holes can be burnt by photochemical processes induced by exposure to intense laser radiation with a wavelength within the inhomogeneously broadened line.

Optical Data Storage•Jan 1, 1983•0 citations

Ultra-High Density Optical Memory by Photochemical Hole Burning (PHB) and Multi-Layered PHB System

Motomu Yoshimura, Tetsuya Nishimura, Noriaki Tsukada

We have shown a possibility to store data at more than 600x10 8 bits/cm 2, by forming a double-layered PHB system. This memory density is the highest one reported so far.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 19, 1989•4 citations

Molecular electronics for frequency domain optical storage: Persistent spectral hole-burning - A review

W. E. Moerner

Persistent spectral hole-burning (PHB) is a phenomenon that allows an additional dimension, the frequency at which spectral holes are written, to be used to encode digital data. PHB can be used to store a large number of bits of information in the volume irradiated by a focused laser beam, leading to a possible future storage technology, frequency domain optical storage. A large number of photochemical and photophysical mechanisms have led to the production of spectral holes; a wealth of information has been learned about host-guest interactions, dephasing, and solid-state photochemistry at low temperatures. The general structure of a frequency domain optical store places a set of constraints on the engineering of such a system as well as on the materials used as recording media. The dynamics of the hole-burning process are crucial; for monophotonic mechanisms in particular, a set of stringent constraints can be derived that limit the applicability of this class of materials. Recent discoveries of two-color, photon-gated hole-burning offer special promise for nondestructive reading and improved performance.

•Mar 25, 1985•10 citations

Frequency Domain Optical Storage: The Importance of Photon-Gated Materials

W. E. Moerner, R. M. Macfarlane, Wilfried Lenth

Persistent spectral hole-burning (PHB, also called photochemical hole-burning) permits use of the optical frequency for encoding digital information through the presence and absence of spectral holes that are burned in inhomogeneously broadened absorption lines at low (liquid helium) temperatures. The optical frequency or wavelength at which a given hole is burned acts as an additional dimension for data storage, hence this optical recording scheme has been called Frequency Domain Optical Storage (FDOS). The combination of spectral and spatial data-recording can make storage densities in excess of 1010 bits/cm2 possible; furthermore, since rotation of the recording medium is not necessary, shorter random access times will result. The future success of the FDOS concept will rely on progress in several technological and engineering areas as well as on advances in several critical materials areas1.

Optical Data Storage•Jan 1, 1987•1 citation
Cryogenic frequency domain optical memories based upon photochemical hole burning offer the possibility of storing data at densities of up to 10 to the 11th power bits/sq.cm. The basic principles of photochemical hole burning are reviewed. Recent results on recording materials, data reading and writing, and system configurations are presented. (Author)
Recently there has been considerable interest in frequency domain optical memories based on the cryogenic phenomenon of photochemical hole burning.1 This phenomenon occurs whenever persistent photochemical changes can be induced by exposure to narrowband optical radiation tuned to a frequency within the inhomogeneously broadened zero phonon line of a photoactive material contained In a host. The narrowband radiation selectively excites that fraction of molecules whose homogeneous linewidth overlaps the excitation frequency. The ensuing photochemical reaction results in a persistent narrow dip or hole in the line shape. Since typical ratios of inhomogeneous- to-homogeneous widths are of the order of 103, 103 resolvable holes can be burned into the inhomogeneous line at each spatial location in the sample. Thus the storage density in such a frequency domain optical memory might ultimately be 103 higher than in a conventional optical memory.
Many investigations have been done on the field of frequency domain optical memories based on photochemical hole burning (PHB). This effect offers an extra dimension for the organization of an optical memory. At cryogenic temperatures several solid state materials such as aggregate color centers in alkali halide crystals exhibit inhomogeneously broadened absorption lines. In such an absorption line permanent narrow holes can be burnt by photochemical processes induced by exposure to intense laser radiation with a wavelength within the inhomogeneously broadened line.
Persistent spectral hole-burning (PHB) is a phenomenon that allows an additional dimension, the frequency at which spectral holes are written, to be used to encode digital data. PHB can be used to store a large number of bits of information in the volume irradiated by a focused laser beam, leading to a possible future storage technology, frequency domain optical storage. A large number of photochemical and photophysical mechanisms have led to the production of spectral holes; a wealth of information has been learned about host-guest interactions, dephasing, and solid-state photochemistry at low temperatures. The general structure of a frequency domain optical store places a set of constraints on the engineering of such a system as well as on the materials used as recording media. The dynamics of the hole-burning process are crucial; for monophotonic mechanisms in particular, a set of stringent constraints can be derived that limit the applicability of this class of materials. Recent discoveries of two-color, photon-gated hole-burning offer special promise for nondestructive reading and improved performance.
Persistent spectral hole-burning (PHB, also called photochemical hole-burning) permits use of the optical frequency for encoding digital information through the presence and absence of spectral holes that are burned in inhomogeneously broadened absorption lines at low (liquid helium) temperatures. The optical frequency or wavelength at which a given hole is burned acts as an additional dimension for data storage, hence this optical recording scheme has been called Frequency Domain Optical Storage (FDOS). The combination of spectral and spatial data-recording can make storage densities in excess of 1010 bits/cm2 possible; furthermore, since rotation of the recording medium is not necessary, shorter random access times will result. The future success of the FDOS concept will rely on progress in several technological and engineering areas as well as on advances in several critical materials areas1.