Abstract
We recorded picosecond photochemically accumulated stimulated photon echo (PASPE) holograms by using two-color photon-gated persistent spectral hole- burning at liquid-helium temperature. Images stored using this technique have more than three orders of magnitude higher read-out stability compared with the one-color process. We used Zn-tetra-phenyl-tetrabenzoporphyrin in a polystyrene film with 20% hexachloroethan (C2Cl6) as recording material. The long lifetime of the triplet state allows the observation of a transient image prior to the fixation of the image. By restricting the green gating beam to a part of the transient hologram image on the polymer film, the photoreaction takes place only in the area illuminated with both colors, and this part of the image is stored permanently.
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