Digital holographic storage system incorporating optical fixing

Digital holograms have been written in stoichiometric Pr:LiNbO₃ in a two-color recording scheme, demonstrating what is to our knowledge the first all-optical nondestructive readout of digital data. Using writing light at 800 nm and gating light at 476 nm, we stored and retrieved 256-kbit digital data pages with a raw bit-error rate BER of $<{10}^{-4}$.