Nonlinear refraction, nonlinear absorption, and optical limiting in BSO and BGO photorefractive crystals

This paper presents experimental results on nonlinear refraction, nonlinear absorption and optical limiting in photrefractive crystals Bi₁₂SiO₂₀ (BSO) and Bi₁₂GeO₂₀ (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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