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In this invited talk, we will review optical cryptography with biometrics for multi-depth objects using optical scanning holography (OSH). We also focus on the discussion of key distribution.

A lossy hologram compression method is investigated to compress three-dimensional (3-D) images holographically recorded with optical scanning holography. Without loss of major reconstruction details, results have shown that the lossy compression method is able to achieve high compression ratio of up to 100.

We propose a holographic display method to reconstruct two on-axis holograms free of the zeroth-order light and the twin image using two amplitude-modulation spatial light modulators (SLMs).

Stratified volume holographic optical elements (SVHOE's) comprise a recently proposed class of novel diffraction structure, it's unique angular selectivity of the SVHOE's Bragg diffraction process have more promising applications. The previous study of SVHOE's are mainly based on isotropic materials, in this paper we study the diffraction properties of holographic gratings in anisotropic media separated by buffer layers using the method of Coupled wave theory. It is shown that the diffraction efficiency of such system also exist the uniform periodic angular sensitivity, in addition the dependence of the periodic SVHOE angular sensitivity on number of layers and total SVHOE thickness have been discussed.