Multilayered optical data storage using a spatial soliton, which has the potential to increase the number of recording layers, is proposed and experimentally investigated. A Ti:sapphire pulsed laser focusing near the surface of a Ce-doped Sr_(0.75)Ba_(0.25)Nb_2O_6 crystal generated a second-harmonic (SH) beam associated with the self-focusing fundamental laser and induced SH collision responses to the counterpropagating laser pulses. Using threshold controls, single-bit data were recorded with a domain-reversal technique at the collision point, and its data were read out through a quasi-phase-matched SH generation process enhanced at the reversed domains. Multilayered recording and selective data rerecording were also demonstrated.
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