Abstract
The efficiency of lossless volume holograms in converting plane and cylindrical waves into each other is analysed and the results are plotted as a function of the normalised thickness of the hologram. A coupler consisting of two separate holograms, and capable of converting a divergent cylindrical wave into a convergent cylindrical wave, is also investigated, and it is shown that under favourable conditions an overall efficiency of 98.3% may be obtained.
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