Femtosecond third-order optical nonlinearity of BiFeO3.
We report both linear and nonlinear optical properties of a ferroelectric thin film of polycrystalline BiFeO(3) deposited on a quartz substrate. The linear refraction index and absorption coefficient of the film are determined as a function of light wavelength by optical transmittance measurements. By performing Z-scan experiments with femtosecond laser pulses at a wavelength of 780 nm, the third-order nonlinear refraction index and two-photon absorption (2PA) coefficient are measured to be 1.5 x 10(-4) cm(2)/GW and 16 cm/GW, respectively. The results indicate that the thin film of polycrystalline BiFeO(3) is a promising candidate for applications in nonlinear photonic devices.
Gu
Bing
B
Department of Physics, Nanjing Normal University, Nanjing, China. gubing@njnu.edu.cn
Wang
Yang
Y
Wang
John
J
Ji
Wei
W
D000042:Absorption; D003460:Crystallization; D007834:Lasers; D008027:Light; D055095:Optics and Photonics; D010777:Photochemistry / Q000379:methods; D017785:Photons; D011791:Quartz; D012542:Scattering, Radiation; D013053:Spectrophotometry / Q000379:methods; D013696:Temperature
D011791:Quartz