Patent ID: 7700270

Claim:
A method making and scanning using holograms formed in photo-thermo-refractive (PTR) glasses comprising the steps of: optionally exposing PTR glass with a periodic pattern of a source of ionizing radiation; exposing the exposed PTR glass with high-power Visible radiation generated by a high power source generating at approximately 10 megawatts/cm 2 to approximately 100 gigawatts/cm 2 ; thermal treating the radiation exposed PTR glass; generating a plurality of holograms in the thermal treated PTR glass as Bragg gratings; and replaying holograms formed in the exposed and thermal treated PTR glass with a laser beam, wherein the replaying step comprises the step of: spinning a first PTR hologram about it's optical axis while moving a second PTR hologram in an arc so that it is located coincident with a laser beam diffracted by the first PTR hologram and spinning the second PTR hologram about the optical axis of the laser beam diffracted by the first PTR hologram.