Pixel-matched phase-conjugate readout for holographic data storage

We demonstrate one-to-one pixel-matching of phase-conjugate digital volume holographic data storage, with data pages as large as a megapel (1024×1024 pixels). A self-pumped phase-conjugate mirror in BaTiO3 is used to provide a phase-conjugate reference beam, which reconstructs the data-bearing object beam from a LiNbO3 crystal using the 90° geometry. The systems tradeoffs of phase-conjugate readout are described, and two methods of generating phase-conjugate reference beams are described and compared.