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17th Congress of the International Commission for Optics: Optics for Science and New Technology

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

Matthias Esselbach

Published Sep 1, 1996• 0 citations
Publisher

Abstract

We show a possibility of realizing an optical memory using dynamic refreshment. Via phase-correct back-coupling by means of nonlinear optical phase-conjugation the information stored in a photorefractive crystal is periodically read out, transmitted into a second crystal acting as an auxiliary memory and from this transmitted back into the first crystal. In this way the information is refreshed.

DOI
10.1117/12.2316149

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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2019•0 citations
We show a possibility of realizing an optical memory using dynamic refreshment. Via phase-correct back-coupling by means of nonlinear optical phase-conjugation the information stored in a photorefractive crystal is periodically read out, transmitted into a second crystal acting as an auxiliary memory and from this transmitted back into the first crystal. In this way the information is refreshed.
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.