The third-order optical nonlinearity of The pyrochlore phase 0.7Pb(Mg1/3Nb2/3)O3–0.3PbTiO3 thin film on quartz

• DOI: 10.1016/j.physb.2005.09.023
• Publication Date: 2005-11-10T12:17:48Z
• Authors: F.W. Shi; X.J. Meng; G.S. Wang; T. Lin; J.H. Ma; Y.W. Li; J.H. Chu
• Keywords: 0103 physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences

Abstract The xPb(Mg1/3Nb2/3)O3–(1−x)PbTiO3 (PMNT) (with x = 0.7 ) thin film is prepared on quartz substrates prepared using a sol–gel process. The PMNT thin film has a well-crystallized pyrochlore phase structure. The sign and magnitude of both real and imaginary parts of third-order nonlinear susceptibility χ ( 3 ) of the thin film have been determined by the Z-scan technique performed at 800 nm with a femtosecond laser. The nonlinear refraction index coefficient γ, the nonlinear absorption coefficient β of the thin film are 1.37×10−12 cm2/W and −6.73×10−8 m/W, respectively. The real and imaginary part of the third-order nonlinear susceptibility of the film are 1.06×10−17 and −1.65×10−19 m2/V2, respectively. The results suggested that the nonlinearity is dominated by the refractive for the film.