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Spectral Hole-Burning and Related Spectroscopies: Science and Applications

Coherent erasure and processing in time-domain optical storage

Ulf Elman, Stefan Kröll

Published Jan 1, 1994• 0 citations
Publisher

Abstract

Persistent spectral hole-burning and photon echoes can provide insight into the dynamics of amorphous and crystalline materials on the molecular/atomic level. Part of the current interest in these methods, however, is also caused by the existence of potential applications in optical data storage and processing. At present it may be difficult to specify exactly at what applications these techniques should try to target but, based on current research efforts and results, it appears that persistent spectral hole burning is a possible candidate for high density, possibly long time, volumetric storage, while photon echoes have properties more attractive for short time storage or storage connected to processing applications.

DOI
10.1364/shbs.1994.wc4

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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.