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|Type:||Artigo de periódico|
|Title:||Growth And Characterization Of Photorefractive Bi12tio20 Single Crystals|
|Abstract:||Photorefractive Bi12TiO20 single crystals of high optical quality were grown in a resistive heating furnace from high temperature nonstoichiometric (10:1) solutions of Bi2O3 and TiO2 at pulling rates 0.3-0.8 mm/h at rotation 20-30 rpm along the 〈001〉 and 〈011〉 axis. Powder X-ray analysis, Laue method, and electron-probe microanalysis were used for characterization. BTO crystals have the bcc structure of sillenite type with a0 = 10.178(8) angstrom. The chemical composition of the crystals can be written down as Bi12.1±0.2Ti0.96±0.09O20.1. Natural optical activity q of BTO crystals is 6.3 ± 0.2 deg/mm at λ = 0.633 μm and 11.9 ± 0.2 deg/mm at λ = 0.5145 μm, optical absorption coefficient α = 0.42 ± 0.04 cm-1 at λ = 0.633 μm and linear electro-optic coefficient r41 = r52 = r63 = 5.3pm/V. Fanning effect in the 'fiber-like' BTO sample was studied and double phase conjugation with conversion efficiency up to 8% was observed in a wide range of incidence angles of the pump at λ = 0.633 μm for 2 × 3 mW input light power.|
|Editor:||Akademie-Verlag Berlin, Berlin, Germany|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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