Nonlinear refraction, nonlinear absorption, and optical limiting in BSO and BGO photorefractive crystals
Aleksandr RyasnyanskiySamarkand State Univ. (Uzbekistan)
Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEjournal2004en
ABI
Abstract
This paper presents experimental results on nonlinear refraction, nonlinear absorption and optical limiting in photrefractive crystals Bi<sub>12</sub>SiO<sub>20</sub> (BSO) and Bi<sub>12</sub>GeO<sub>20</sub> (BGO) at the fundamental and second harmonic wavelengths of picosecond Nd:YAG laser radiation. It is shown that nonlinear refraction was due self-focusing process when nonlinear absorption was due to three-photon absorption at the wavelength of 1064 nm and two-photon absorption at the wavelength of 532 nm.
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