Low- and high-order nonlinear optical properties of BaTiO_3 and SrTiO_3 nanoparticles

Abstract

We present the studies of the third- and higher-order nonlinear optical processes in barium titanate (BaTiO3) and strontium titanate (SrTiO3) nanoparticles. We measured the nonlinear refractive indices and nonlinear absorption coefficients of the BaTiO3 and SrTiO3 nanoparticles dissolved in ethylene glycol using the 790 nm fs and ps pulses. The high-order harmonic generation up to the 39th order was achieved in the BaTiO3 and SrTiO3 nanoparticles-contained plumes when the femtosecond radiation propagated through the preformed plasma. The 1×10−6 and 4×10−6 high-order harmonic efficiencies at the plateau region were achieved in the cases of the BaTiO3 and SrTiO3 nanoparticles-contained plasmas.