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Tests of optical data storage in arrays of microfibers confirm its applicability and potential for higher storage densities than those achievable with conventional holographic data storage. Arrays of single-mode microfibers, spaced 0.78 microm apart and 60 microm long, were generated in a photopolymer film with four laser beams and simultaneously inscribed with Lippmann-Bragg fringes by use of a counterpropagating beam. Following the curing steps, spectra of white light retroreflected from a single fiber exhibit the reconstructed spectral lines of the multiwavelength laser used in the recording step; 10(11) bits/cm(2), or 10(13) bits on a compact disk, appear to be recordable.

Acousto-optic imaging is a technique that maps the optical properties of thick scattering sample with a millimetric resolution. The detection of the acousto-optic signal represents a challenge because it is very weak amongst a strong parasitic signal. Various methods based on holography in photorefractive crystals or digital holography have been studied. Here dynamic holography is obtained with the gain medium Nd:YVO 4 . We study the experimental feasibility of a detection system based on holography in a gain media and show the first acousto-optic results obtained in a 5mm slice of chicken breast.

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