Critical Coupling Strength For Enhanced Four-Wave Mixing By Use Of Moving Interference Gratings In Diffusion Dominated Photorefractive Crystals

Cornelia Denz; Joachim Goltz; Theo Tschudi

doi:10.1117/12.947879

8 February 1988 Critical Coupling Strength For Enhanced Four-Wave Mixing By Use Of Moving Interference Gratings In Diffusion Dominated Photorefractive Crystals

Cornelia Denz, Joachim Goltz, Theo Tschudi

Author Affiliations +

Proceedings Volume 0963, Optical Computing '88; (1988) https://doi.org/10.1117/12.947879
Event: Optical Computing '88, 1988, Toulon, France

Abstract

In nearly degenerated four-wave mixing the application of running gratings in the crystal produces an enhancement of the four-wave mixing efficiency compared to the case of degenerated four-wave mixing with stationary gratings'. In diffusion dominated photorefractive crystals that enhancement is obtained only if the coupling strength rises above a critical value. In our analytical study we examine that critical coupling strength for weak input signals as a function of the pump beam intensity ratio. Moreover, we discuss the dependence of the reflectivity on the (temporal) grating frequency.

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Cornelia Denz, Joachim Goltz, and Theo Tschudi "Critical Coupling Strength For Enhanced Four-Wave Mixing By Use Of Moving Interference Gratings In Diffusion Dominated Photorefractive Crystals", Proc. SPIE 0963, Optical Computing '88, (8 February 1988); https://doi.org/10.1117/12.947879

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