Large Third-Order Nonlinear Optical Susceptibility of Rh-Doped BaTiO 3 Thin Films Prepared by Pulsed Laser Deposition

Rh-doped barium titanate (BaTiO 3 ) epitaxial thin films have been fabricated on SrTiO 3 (100) substrates by pulsed laser deposition. The nonlinear optical properties of the films were determined using the z-scan method at a wavelength of 532 nm with a laser duration of 10 ns. The real and imaginary parts of the third-order nonlinear susceptibility χ (3) were 5.71 × 10 -7 esu and 9.59 × 10 -8 esu, respectively. The real part value of χ (3) of the Rh:BaTiO 3 films is about one order larger than that of Ce-doped BaTiO 3 thin films. The results show that Rh:BaTiO 3 thin films have great potential applications for nonlinear optical devices.