A Z-Scan Study of LiNbO3 Thin Films
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Abstract
Poly-crystal LiNbO3 films on a fused SiO2 substrate are prepared by the rf sputtering technique. The third-order optical nonlinearity of the LiNbO3 films has been investigated by using Z-scan method with picosecond laser pulses at the wavelength of 532 nm. The nonlinear refractive index γ and nonlinear absorption coefficient β are determined to be -7.2 x 10-9cm2/W and 0.39cm/kW, respectively. The third-order optical nonlinearity x(3) of the LiNbO3 film is about 9.1 x 10-7 esu, which is considerably large than the reported value for Z-cut pure LiNbO3 crystals.
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