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Spectral Hole-Burning and Related Spectroscopies: Science and Applications

Incoherent Light Read-Out of Spectral Holograms

Anne Débarre, J. Keller, J.-L. Le Gouët, P. Tchénio

Published Jan 1, 1991• 0 citations
Publisher

Abstract

It is known that one has investigated two types of approach to Persistent Spectral Hole Burning (PHB), and to potential application for optical data storage. In both methods, a structure is stored within the inhomogeneously broadened optical absorption line of the guest ions or molecules in a host matrix at low temperature.
DOI
10.1364/pshb.1991.fb3

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One very exciting application of laser spectroscopy would be to use the high-resolution capabilities of today’s lasers and the phenomenon of persistent spectral hole-burning to form a frequency domain optical storage system.1 In such a system, bits of information would be stored by locally modifying (in the frequency domain) the shape of an inhomogeneously broadened absorption line of an absorber in a solid at low temperatures. Because typical homogeneous widths are 1000X (or more) narrower than typical inhomogeneous widths, as many as 1000 bits could be written in one diffraction-limited 1-μm spot In a sample, yielding the impressive storage density of 1011 bits/cm2.

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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.

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It is acknowledged that inhomogeneous absorption bands consisting of narrow homogeneous zero-phonon lines (ZPL) can be used for the purpose of optical data storage in the frequency dimension /1/. Persistent spectral hole-burning (PSHB) /2,3/ has made it feasible to preserve the recorded frequency domain information for a practically unlimited period of time. Via PSHB the inhomogeneous distribution function of the resonance frequencies of the impurity zero-phonon lines can be altered in an almost arbitrary fashion. This, in turn, makes it possible to manipulate the absorption coefficient and correlated to it index of refraction of the optical storage media. On this basis it has been proposed to use PSHB for the shaping of laser pulses via Fourier synthesis /4/. Holographic storage of time domain optical signals in PSHB media was proposed by Mossberg /5/. In the first experiments on the PSHB time domain holography the reproduction of various temporal shapes of picosecond pulses was demonstrated in dye doped polymers cooled to liquid helium temperature /6/. Earlier Zuikov et al. observed correlation between the temporal shapes of nanosecond excitation laser pulses and photon echo signals /7/. Since that time a variety of experiments on time domain holography in different resonant media have been reported (see /8/ and references therein).

Spectral Hole-Burning and Related Spectroscopies: Science and Applications•Jan 1, 1992•0 citations
One very exciting application of laser spectroscopy would be to use the high-resolution capabilities of today’s lasers and the phenomenon of persistent spectral hole-burning to form a frequency domain optical storage system.1 In such a system, bits of information would be stored by locally modifying (in the frequency domain) the shape of an inhomogeneously broadened absorption line of an absorber in a solid at low temperatures. Because typical homogeneous widths are 1000X (or more) narrower than typical inhomogeneous widths, as many as 1000 bits could be written in one diffraction-limited 1-μm spot In a sample, yielding the impressive storage density of 1011 bits/cm2.
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.
Persistent spectral hole burning (PSHB) [1] allows for frequency selective recording of holograms and opens interesting prospects for high density optical information storage and processing. When hole burning is performed with the interference pattern of two crossed laser beams a spectrally narrow hole is created in an inhomogeneously broadened absorption band and simultaneously the spatial fringe pattern is recorded as a modulation of the hole depth. During reconstruction of the hologram diffraction from this spatial fringe pattern occurs, reflecting the changes of the absorption coefficient and the refractive index introduced by the spectral hole [2].
Persistent spectral hole-burning (PHB) 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 temperatures. The combination of spectral and spatial data recording can make storage densities of 1010 bits/cm2 possible. The most challenging innovation needed to achieve a practical storage system is presented by the complex materials requirements1 on a successful storage medium.
It is acknowledged that inhomogeneous absorption bands consisting of narrow homogeneous zero-phonon lines (ZPL) can be used for the purpose of optical data storage in the frequency dimension /1/. Persistent spectral hole-burning (PSHB) /2,3/ has made it feasible to preserve the recorded frequency domain information for a practically unlimited period of time. Via PSHB the inhomogeneous distribution function of the resonance frequencies of the impurity zero-phonon lines can be altered in an almost arbitrary fashion. This, in turn, makes it possible to manipulate the absorption coefficient and correlated to it index of refraction of the optical storage media. On this basis it has been proposed to use PSHB for the shaping of laser pulses via Fourier synthesis /4/. Holographic storage of time domain optical signals in PSHB media was proposed by Mossberg /5/. In the first experiments on the PSHB time domain holography the reproduction of various temporal shapes of picosecond pulses was demonstrated in dye doped polymers cooled to liquid helium temperature /6/. Earlier Zuikov et al. observed correlation between the temporal shapes of nanosecond excitation laser pulses and photon echo signals /7/. Since that time a variety of experiments on time domain holography in different resonant media have been reported (see /8/ and references therein).