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TWO-COLOR, PHOTON-GATED SPECTRAL HOLE-BURNING

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Abstract

Persistent spectral hole-burning (PHB) has been proposed as the essential element of a frequency domain optical storage system1 in which the frequency at which a hole is burned in an inhomogeneously broadened absorption line at low temperatures serves as an additional dimension for the storage of digital information. Essentially all of the mechanisms studied until recently have been single-photon mechanisms, i.e., the photoionduced change leading to hole-burning (writing) for a given center occurs with a certain fixed probability after the absorption of one photon. Such linear, monophotonic processes suffer from the drawback that the act of detecting holes (reading) can also produce changes in the absorption line. Recent modeling studies of the generalized single-photon process2 have shown that thousands to tens of thousands of reads can be obtained from single-photon mechanisms only when the material possesses high quantum efficiency and low absorption cross section. These restrictive requirements do not apply for photon-gated hole-burning mechanisms, i.e., those mechanisms for which hole-burning occurs only in the presence of an additional “gating” light source, because for these mechanisms, reading is performed in the absence of the gating light and is therefore nondestructive.

© 1985 Optical Society of America

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