We demonstrate selective fixing of volume holograms in photorefractive
media. Each holographic page may be fixed individually and overwritte
n without destroying the other fixed pages. We present experimental re
sults describing this process in Cr-doped Sr0.75Ba0.25Nb2O6 at room te
mperature, with hologram lifetimes exceeding 100 days during continuou
s readout with an intense beam (1 W/cm2).