Picosecond photorefractive effect in BaTiO₃

Abstract

We report the observation of photorefractive index gratings written and read out in BaTiO₃ using single pulses of 30-psec duration and fluences of 1 to 15 mJ/cm² at a wavelength of 0.532 μm. While the photorefractive gratings are masked during formation by large free-carrier grating, they are clearly seen from 50 psec to many minutes following the peak in the writing beams. The rapid and complete formation of the photorefractive grating and the complete decay of the free-carrier grating on a scale of 50 to 100 psec indicate either that the carrier-recombination time in our sample of BaTiO₃ is less than 100 psec or that the mobility of the carriers is >23 cm²/V sec.

© 1987 Optical Society of America

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