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Journal of Optics A Pure and Applied Optics

Optical storage of information via refreshing by inverse seeding (OSIRIS)

Matthias Esselbach, Gregor Cedilnik, Armin Kießling, Richard M. Kowarschik

Published Oct 29, 1999• 4 citations
Publisher

Abstract

In this paper we discuss the possibility for realizing an optical memory using dynamic refreshment. Using phase-correct back coupling by means of nonlinear optical phase conjugation the information stored in a photorefractive crystal is continuously read out, transmitted into an auxiliary memory and from this back into the crystal again and is, in this way, refreshed. Practical realizations and first results are presented.

DOI
10.1088/1464-4258/1/6/103

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Applied Optics•Nov 10, 1999•92 citations
In this paper we discuss the possibility for realizing an optical memory using dynamic refreshment. Using phase-correct back coupling by means of nonlinear optical phase conjugation the information stored in a photorefractive crystal is continuously read out, transmitted into an auxiliary memory and from this back into the crystal again and is, in this way, refreshed. Practical realizations and first results are presented.
We propose a dynamic refreshing technique in a photorefractive memory with double mutually pumped phase conjugate mirrors. Long-term continuous readout without any fixing technique can be achieved by the high quality image refreshing that uses the resonance of the phase conjugate beams with image information between phase conjugate mirrors. We perform the experiment on the long-term reading of the images in the photorefractive memory with BaTiO/sub 3/ crystals and achieve the continuous reading time over 10 times longer than the time constant of the crystal without image degradation.
Storing and delaying optical information is of crucial importance for optical communications, signal processing and in the quantum domain. A plethora of techniques for optical storage have been shown which aim to maintain as much as possible the advantages of optics, such as e.g. the coherence, the bandwidth and capacity. In particular the interaction of optical waves with mechanical motion offers a solution to buffer optical information [1-4]. It was shown that one can use acoustic waves to store and delay optical signals coherently via the effect of stimulated Brillouin scattering (SBS) [3,4]. This allows for simultaneous storage at multiple wavelengths [5], cascaded storage at different spatial positions [6], and nonreciprocal storage with a GHz bandwidth [7]. However, the delay time of this technique is so far limited to the acoustic lifetime of about 10 ns.
An encrypted optical memory system that uses a wavelength code as well as input and Fourier-plane random phase codes is proposed. Original data are illuminated by a coherent light source with a specified wavelength and are then encrypted with two random phase codes before being stored holographically in a photorefractive material. Successful decryption requires the use of a readout beam with the same wavelength as that used in the recording, in addition to the correct phase key in the Fourier plane. The wavelength selectivity of the proposed system is evaluated numerically. We show that the number of available wavelength keys depends on the correlation length of the phase key in the Fourier plane. Preliminary experiments of encryption and decryption of optical memory in a LiNbO(3):Fe photorefractive crystal are demonstrated.