1 January 1987 Image Transmission And Self-Oscillation In An Active Phase-Conjugated Ring Resonator Using BaTiO3
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Proceedings Volume 0813, Optics and the Information Age; (1987); doi: 10.1117/12.967158
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada
Abstract
Applications of active feedback in optics have been discussed by several authors. For example cohe-rent optical systems have been proposed for analog optical computing /1/. Recently progress has been made in the field of holographic associative memories /2/ and several coherent optical feedback configurations have been realized /3/. So far in those experiments the apertures were limited in diameter as well as angle and also the achieved amplification factors were not suitable enough for applications. In our work we studied a feedback system with ring structure together with photorefractive amplifiers. An increase of the space-bandwidth product of former systems was realized with the use of the aberration compensating properties of the phase conjugating element. Moreover this phase conjugating element allowed a gain in the feedback loop of > 50. We studied further possibilities of incorporating even higher gain in the loop (up to several thousands). Both amplifier types were realized with photorefractive crystals of BaTiO3 /4,5/. Injection of a spatially modulated beam into this active feedback system causes image bearing os-cillation. Experimental results concerning image transmission and self oscillation are reported.
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T Tschudi, H Klumb, T. Kobialka, A Herden, F. Laeri, T H Darmstadt, J. Albers, "Image Transmission And Self-Oscillation In An Active Phase-Conjugated Ring Resonator Using BaTiO3", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967158; https://doi.org/10.1117/12.967158
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KEYWORDS
Resonators

Phase conjugation

Optical amplifiers

Crystals

Mirrors

Image transmission

Image filtering

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