CROSSTALK BY NONLINEAR GRATING COMBINATIONS IN PHOTOREFRACTIVE HOLOGRAMS COMPUTED DIRECTLY FROM THE BAND-TRANSPORT MODEL

Author:

BUCHHAVE PREBEN1

Affiliation:

1. The Optics Group, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark

Abstract

The crosstalk between two photorefractive holograms caused by nonlinear grating interactions is computed directly from the band-transport equations without using an empirical reduction factor to describe the difference between the modulation index of the impressed intensity grating and the resulting free carrier modulation. The long period grating modulation resulting from the interference between closely spaced object beams cannot write a holographic grating, but is treated as a local modulation of the high frequency part of the grating. The method can be applied as long as the low frequency envelope does not in itself write a photorefractive grating. With this limitation the method can be used for arbitrary values of modulation indices and beam ratios where the simple band-transport equations apply.

Publisher

World Scientific Pub Co Pte Lt

Subject

Physics and Astronomy (miscellaneous),Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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