Linear and nonlinear optical properties of rare earth doped of Ba0.7Sr0.3TiO3 thin films

Abstract

Ba0.7Sr0.3TiO3:Eu ferroelectric films were deposited on quartz substrates by pulsed laser deposition. The linear absorption coefficient and the linear refractive index calculated from the transmission spectrum at 532 nm were found to be 1.67x10(4) cm(-1) and 1.82 respectively. The room temperature photoluminescence shows the characteristic emission of Eu3+ ions. The nonlinear optical properties of the film were investigated by a single beam Z-scan setup. The negative nonlinear refractive index and two photon absorption coefficient was found to be -1.508x10(-6) m(2)/GW and 240 m/GW respectively. The real and imaginary part of the third order susceptibility of the thin films is 2.58x10(-17) m(2)/V-2 and 1.16x10(-16) m(2)/V-2 respectively. The BST:Eu thin films show good optical limiting property.