Abstract
A new methodology describing the effects of aperiodic and multiplexed gratings in volume holographic imaging systems (VHIS) is presented. The aperiodic gratings are treated as an ensemble of localized planar gratings using coupled wave methods in conjunction with sequential and non-sequential ray-tracing techniques to accurately predict volumetric diffraction effects in VHIS. Our approach can be applied to aperiodic, multiplexed gratings and used to theoretically predict the performance of multiplexed volume holographic gratings within a volume hologram for VHIS. We present simulation and experimental results for the aperiodic and multiplexed imaging gratings formed in PQ-PMMA at 488nm and probed with a spherical wave at 633nm. Simulation results based on our approach that can be easily implemented in ray-tracing packages such as Zemax® are confirmed with experiments and show proof of consistency and usefulness of the proposed models.
Highlights
Volume holographic imaging systems (VHIS) consisting of volume holographic gratings as specialized spatial-spectral filters have recently been successfully applied to microscopic and spectroscopic application
Kogelnik’s two-beam approximate coupled-wave (ACW) analysis [8] and rigorous coupled-wave (RCW) theory [9] have been used extensively to model diffraction effects of uniform gratings formed by two plane waves
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Summary
Volume holographic imaging systems (VHIS) consisting of volume holographic gratings as specialized spatial-spectral filters have recently been successfully applied to microscopic and spectroscopic application. Syms and Solymar [11,12] demonstrated treating a grating with localized planar grating sections of variable in orientation across the hologram It is based on wave optics and not convenient for design process. In Ref [13,14,15], the Born approximation was used to obtain analytical models for volume holographic gratings This technique is based on wave optics under assumptions of weak interaction among the incident and diffracted light [8]. In case of volume holograms of high-diffractive efficiency, the approximation breaks down because the incident light is strongly depleted
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