Abstract

The mixing of two sets of mutually coherent beams, termed double two-beam mixing, is considered. At low modulation depth, combination gratings of the primaries are analyzed theoretically and show that the internal electric fields in photorefractive media also have cross components with wave vectors K₁ ± K₂ in addition to the primary components K₁ and K₂ and higher orders of 2K₁ and 2K₂, where K₁ and K₂ are wave vectors of two fringes. Each component is given in the form of an analytical solution, and the coupling behavior is studied for all relations between K₁ and K₂. The results show that the coupling behavior depends not only on the primary gratings but also on the combination grating K₁ and K₂ and the high-order grating 2K₁ or 2K₂. These features can be employed theoretically in phase-intensity transform and wavelength conversion.

© 1996 Optical Society of America

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