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Photorefractive-index gratings formed by nanosecond optical pulses in BaTiO3

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Abstract

We write and read a refractive-index grating in a photorefractive crystal BaTiO3 with a single 20-nsec laser pulse at 532 nm. The grating formed is erasable with similar pulses. Diffraction efficiency decreases exponentially with the cumulative erasing light energy for 20-nsec pulses at intensity levels of 5–30 MW/cm2. Optical energies required to write and erase gratings with 20-nsec pulses are about an order of magnitude larger than for millisecond-to-second-long pulses at 515 nm, even though the grating is still formed by a one-photon process.

© 1981 Optical Society of America

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