HOLOGRAPHIC MOTION-PICTURE BY EU3+-Y2SIO5

Real-time recording of a moving object was made with persistent spectr al hole burning of a cryogenic Eu3+:Y2SiO5 crystal. In a basic hologra phic configuration the ultrastable laser frequency was continuously sc anned within the F-7(0)-5D0 absorption line (typically 200 MHz in 20 s ) while the object was in motion, thus permitting the storage and reco nstruction of the moving image. The success of this motion picture is attributable to (1) the kilohertz-wide hole width, (2) the quasi-persi stent hole lifetime, and (3) the high hole-burning quantum efficiency of this material.