Nonlinear optical absorption and refraction of epitaxial Ba0.6Sr0.4TiO3 thin films on (001) MgO substrates |
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Authors: | SW Liu J Xu D Guzun GJ Salamo CL Chen Y Lin Min Xiao |
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Institution: | (1) Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA;(2) The Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA |
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Abstract: | Highly epitaxial Ba0.6Sr0.4TiO3 (BST) ferroelectric thin films were fabricated on (001) MgOsubstrates by pulsed laser deposition. The nonlinear optical absorption
coefficients (β) and refraction indices (γ) of the BST thin films on (001) MgO substrates were investigated using the single
beam Z-scan technique with femtosecond laser pulses at the wavelengths of 790 nm and 395 nm, respectively, at room temperature.
The nonlinear absorption coefficients of BST thin films were measured to be ∼0.087 cm/GW and ∼0.77 cm/GW at 790 nm and 395 nm,
respectively. The nonlinear refraction indices of BST thin films exhibit a strong dispersion from a positive value of 6.1×10-5 cm2/GW at 790 nm to a negative value of -4.0×10-5 cm2/GW at 395 nm near band gap. The dispersion of γ is roughly consistent with Sheik-Bahae’s theory for the bound electronic
nonlinear refraction resulting from the two-photon resonance. These results show that the BST film is a promising material
as a candidate for nonlinear optical applications.
PACS 42.70.Mp; 78.20.-e; 81.05.-t |
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