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Fanning Laser Light Application to the Characterization of Bi12TiO20 and Bi12SiO20 Crystals

Bi 12 SiO 20 and Bi 12 TiO 20 crystals were grown using the melting technique. The crystals were characterized by DTA, X-ray diffraction, and chemical etching. The fanning effect is known as a self-scattering process in which a single laser light beam self-generates scattering in an asymmetrical way. The intensity distribution of fanning light in the far field measured under an applied electric field, normalized to the intensity measured without a field represents the two-wave mixing gain factory γ. For the experiments an argon laser with λ=515nm and the maximum power of 0.5 W was used and the scattered intensity was recorded. The factor γ(θ,φ) for a set of samples was calculated using the intensity distribution in the far field, recorded with a CCD camera. The values of γ(θ,φ) were correlated with the optical inhomogeneity of the crystals.