The Beam Ratio in Volume Holography

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Abstract
Holograms for potential use as optical interconnects in micro-electronic circuits can be recorded optically by either sequential or simultaneous exposures. It is desirable that these holograms have the highest possible diffraction efficiency. In this paper, we investigate the role of the beam ratio, in both recording modes, in achieving the maximum diffraction efficiency. In the study to determine the optimum beam ratio that is needed in order to obtain the maximum diffraction efficiency on reconstruction, it is usually assumed that either the reference beam intensity, the total object beam intensity, or the average light intensity have been fixed and that the interference fringes have the highest theoretically possible contrast. According to the properties of volume phase holograms, we suggest that the total intensity of all the component beams should be the fixed parameter and that the main refractive index modulation should reach a maximum. Expressions are derived using these assumptions.