Shrinkage correction of volume phase holograms for optical interconnects

The film shrinkage effect of photopolymeric phase media failed to provide the desired volume holograms for point-to-point optical interconnects. In this paper, we report a new compensation method to physically correct the shrinkage effect resulted from the holographic recording and the post baking. Dupont photopolymer HRF-600X001 is studied. The correction of the Bragg diffraction angle shift of 85', which is induced by a 5.25% film shrinkage, is successfully demonstrated with the surface-normal configuration. A shrinkage-corrected volume hologram with 80% diffraction efficiency is experimentally confirmed. The methodology reported herein is applicable to other phase media when the associated film shrinkage data are experimentally determined.