Abstract
Ducharme and Feinberg2 tried without success to explain the observation of photoconductivities that depend on the intensity l as lx, where 0 < x < 1.1 Furthermore, in Refs. 2 and 3 the two-wave mixing gain in a BaTiO3 crystal was measured as a function of grating period and it was found that the gain changes sign at a certain grating period.
© 1986 Optical Society of America
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