Abstract
The Z-scan technique1 proved to be a quite simple method (it uses one laser beam only) for characterization of different optically nonlinear media. Recently this technique was also successively applied to photorefractive crystals (PRCs) Bi12TiO20 (BTO) under an external DC electric field.2 It was shown, however, that due to some point defects and inclusions that are typical for PRCs the standard Z-scan curves are characterized by a rather big spread of experimental points. Here we propose utilization of modulation version of this technique, which gives much better and more reproducible Z-scan. curves in. PRCs.
© 1996 Optical Society of America
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