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Title: Femtosecond Z-scan measurements of nonlinear refraction in nonlinear optical crystals
Authors: Li, H.P.
Kam, C.H.
Lam, Y.L.
Ji, W. 
Issue Date: Jan-2001
Citation: Li, H.P., Kam, C.H., Lam, Y.L., Ji, W. (2001-01). Femtosecond Z-scan measurements of nonlinear refraction in nonlinear optical crystals. Optical Materials 15 (4) : 237-242. ScholarBank@NUS Repository.
Abstract: We report an investigation of third-order optical nonlinearities in several nonlinear optical crystals using the Z-scan technique with femtosecond laser pulses at 780 nm wavelength. The crystals studied include LiNbO3:MgO, KTiOAsO4, KTiOPO4, β-BaB2O4 and LiB3O5, which are extensively used for ultrashort-pulse second-harmonic generation and optical parametric oscillation. The nonlinear refractive index n2 in these crystals has been determined to be in the range from 10-16 to 10-15 cm2/W. No two-photon absorption has been observed. The experimental results are compared with the two-band model for the bound electronic Kerr nonlinearity. It is shown that the measured n2 values in β-BaB2O4 and LiB3O5 are one order of magnitude smaller than those of LiNbO3:MgO, KTiOAsO4, KTiOPO4, which is in agreement with the theoretical prediction.
Source Title: Optical Materials
ISSN: 09253467
DOI: 10.1016/S0925-3467(00)00038-0
Appears in Collections:Staff Publications

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