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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