Using spectroscopic ellipsometry, the room temperature refractive index and absorption versus wavelength of the ferroelectric antiferromagnet bismuth ferrite, BiFeO3, are reported. The material has a direct band gap at 442 nm wavelength (2.81 eV). Using optical second harmonic generation, the nonlinear optical coefficients were determined to be d(15)/d(22)=0.20 +/- 0.01, d(31)/d(22) = 0.35 +/- 0.02, d(33)/d(22)=-11.4 +/- 0.20, and vertical bar d(22)vertical bar = 298.4 +/- 6.1 pm/V at a fundamental wavelength of 800 nm. (C) 2008 American Institute of Physics.
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