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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Requirements to impurity activated solids as materials for optical data storage and processing

K. -S. K. Rebane

Published Aug 3, 2005• 0 citations
Publisher

Abstract

Persistent spectral hole burning (PSHB) has remarkable applications in optical data storage and processing, including space-frequency and space-time domain holographies. Experiments have proven practically everything predicted and proposed by theory. The bottleneck between laboratory experiments and commercial applications is the need in low (liquid He) temperatures, as the main parameter of the data storage efficiency-the ratio between the inhomogeneous and homogeneous zero-phonon line (ZPL) widths α(T) = Γinh/Γhom(T)-- decreases owing to the rapid increase of Γhom(T) with temperature. A few optical and Mossbauer ZPLs are narrow even at RT, but they have usually also narrow Γinh. It is proposed to enlarge Γinh by making use of the Doppler effect. Two possible manifestations of the Doppler effect in the Universe are also discussed.

DOI
10.1117/12.639053

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Persistent spectral hole burning (PSHB) has remarkable applications in optical data storage and processing, including space-frequency and space-time domain holographies. Experiments have proven practically everything predicted and proposed by theory. The bottleneck between laboratory experiments and commercial applications is the need in low (liquid He) temperatures, as the main parameter of the data storage efficiency-the ratio between the inhomogeneous and homogeneous zero-phonon line (ZPL) widths α(T) = Γinh/Γhom(T)-- decreases owing to the rapid increase of Γhom(T) with temperature. A few optical and Mossbauer ZPLs are narrow even at RT, but they have usually also narrow Γinh. It is proposed to enlarge Γinh by making use of the Doppler effect. Two possible manifestations of the Doppler effect in the Universe are also discussed.
Persistent spectral hole-burning (PSHB) and its applications in data storage and processing are described. Purely electronic zero-phonon lines having very high peak values in the low temperature impurity spectra of solids are considered. Limitations for very large capacity PSHB memories put by the number of impurity molecules to store one bit are discussed. Doped with impurities optical fiber memory is proposed as a means to have low impurity concentration simultaneously with a large number of the impurities to store one bit. Bit-by-bit (digital) storage is compared to the distributed one and the advantages of the two versions of the latter -- PSHB holography and PSHB modeling of neural networks -- are considered. An experiment of simultaneous read-out over coordinates and frequency in neural network modeling is described. Requirements to PSHB materials and possibilities of the existence of materials effective at high temperatures are discussed.
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).
Zero-phonon lines in impurity optical spectra and their inhomogeneous broadening are discussed. Photoburning of persistent spectral holes is not only an effective method to eliminate the inhomogeneous broadening and perform high resolution spectroscopy, but it serves also as a powerful tool to control by means of illumination the absorption coefficient and refractive index of the matter. It opens new horizons for frequency-selective optical memories, data storage and data processing. Hole burning by picosecond pulses and the time-and space-domain holography based on it are discussed and the results of the experiments described.
Brief review of zero-phonon lines, persistent spectral hole burning (PSHB) and its applications is given. The provided by PSHB additional dimension - the spectral one in optical data storage allows in principle to get densities up to 1012 bit cm−2 or 1016 bit cm−3. In both cases an 1016 cm−3 cell comprising on average only 100 impurity molecules is involved to store a bit. It is a two small amount because of fluctuations in the distribution of impurities over the cells. Parallel processing and distributed data storage, realized in PSHB holography and optical modelling of neural networks, are prospective to utilize the full capacity of PSHB storage and processing.
Spectroscopies of matrix isolated species and impurity activated solids are close relatives. Both are among the well developing chapters of solid state spectroscopy and optics. In this paper I am trying to give very brief overview what has been achieved in science and applications of impurity activated solids based on zero-phonon lines (ZPLs) in optical data storage and processing. I would like to show that the latter comprises via persistent spectral hole burning time-and-space domain holography in a certain meaning also the "stopping of light". ZPLs are beginning to play a role in the approaches to optical quantum computing.
Persistent spectral hole-burning (PSHB) is a versatile tool to study Stark effect in solids where impurity spectra is strongly inhomogeneously broadened. At liquid helium temperatures impurity homogeneous zero-phonon line widths are small (γhom~10–2-10–4cm–1) and narrow holes can be burnt in the inhomogeneous distribution by illumination with narrow band laser(Δνlaser < γhom) U1- Stark effect alters the shape of narrow spectral holes depending on the Stark shift (splitting) of impurity energy levels, orientation of the impurities, strength and orientation of the electric field, as well as on the properties of the matrix [2].