Abstract

Permanently fixed noisily recorded refractive index gratings are discovered in single crystals of $\mathrm{Li}\mathrm{Nb}{\mathrm{O}}_3:\mathrm{Fe}$ upon long-term exposure to a single laser beam with high intensities of $I=100\mathrm{kW}∕{\mathrm{m}}^2$ and ambient temperature. The fixing process is explained by considering the effect of laser-induced heating of the sample and the well-known simultaneous thermal fixing procedure.

© 2007 Optical Society of America

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