Abstract
Three-dimensional optical memory with photorefractive mate- rials is discussed for ultra-high density/capacity memory exceeding the classical limit of a conventional optical recording system. Bit data are recorded as highly localized refractive index variations in three- dimensional volume using a focused laser beam. We show recording and reading results using a multilayered recording medium with a pho- toisomerization polymer and transparent films. Two-photon recording is also demonstrated. We also discuss the spherical aberration corrections using a volume holographic device, and compact confocal configuration using a semiconductor laser. © 2001 Society of Photo-Optical Instrumentation En- gineers. (DOI: 10.1117/1.1402123)
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