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Abstract
Kogelnik's coupled wave theory is used to obtain the relative phase and directions of the coupled waves at the output of a planar volume grating. This allows us to obtain the energy coupling on a planar volume grating when it is illuminated by two waves related by diffraction. We illustrate this coupling with a two grating beamsplitter that splits an incident polarized beam into two transmitted beams whose intensity ratio may be continuously varied without altering the other beam parameters.