Abstract
Photovoltaic laser beam degradation in lithium niobate () has been investigated through a finite-differences beam propagation method for nonlinear media. The simulations use a two-center model (, ) that has been recently proved to be necessary to successfully describe the photorefractive effect in nominally pure . Refractive index profiles and intensity and phase beam profiles have been calculated for a wide intensity range and several material distances. A good agreement is obtained on comparing simulations and experimental data. This includes self-defocusing for moderate intensities and the complex beam profile structures appearing for high intensities, providing a complete description of this nonlinear optical phenomenon.
© 2014 Optical Society of America
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