Abstract

Sr0.59Ba0.41Nb2O6 and Sr0.75Ba0.25 Nb2O6 exhibit an intensity-dependent absorption in the visible spectral range. We perform pump (green)–probe (red) measurements and find variation as high as 0.45 cm−1 in the absorption coefficient, which depends significantly on the polarization of the probe light beam. Our results indicate a nonexponential dark decay time of the induced absorption and suggest that the trapping potential of the shallow traps varies significantly from one trap to another (multiple isolated shallow traps).

© 1994 Optical Society of America

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