Abstract
We have derived a formula of third-order nonlinear optical susceptibility χ ( 3 ) ( − ω ; ω , − ω , ω ) . Under a scissor approximation by using a first-principle band structure approach, we have calculated the third-order nonlinear susceptibility χ ( 3 ) , dielectric constant ɛ, and the nonlinear optical absorption for BaTiO 3. The imaginary parts of the nonlinear susceptibility, dielectric constant, and two-photon absorption coefficient were calculated and discussed. The calculated two-photon absorption coefficient β equals 0.17 cm/GW, is in good agreement with the experimental value of 0.1 cm/GW under 596 nm laser excitation.
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