Abstract

We recently reported experiments demonstrating the existence of shallow traps in photorefractive barium titanate,1 These traps can be populated by light and depopulated by thermal excitation in the dark. Once populated, the shallow traps cause partial decay of a photorefractive grating In the dark with a decay time of ~2–3 s as shown In Fig. 1. This coasting causes the grating erasure efficiency of a train of short (~20-ns) light pulses to vary with the repetition rate of the pulses.1 Also, populating the shallow traps alters the absorption of the barium titanate crystal,2 so long as the optical excitation cross sections are different for the deep and shallow traps.

© 1988 Optical Society of America

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References

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