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9 October 2000 Femtosecond Z-scan measurements of nonlinear refraction in second-harmonic-generation crystals
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Proceedings Volume 4221, Optical Measurement and Nondestructive Testing: Techniques and Applications; (2000) https://doi.org/10.1117/12.402582
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China
Abstract
The refractive nonlinearity is measured in several nonlinear optical crystals using the Z-scan technique with femtosecond pulses at 780-nm wavelength. The crystals studied include KTiOPO4, KTiOAsO4 (beta) BaB2O4, LiB3O5 and LiNbO3:MgO, which are extensively used for ultrashort- pulse second-harmonic generation and optical parametric oscillation. The nonlinear refractive index n2 in these crystals is determined to be in the range from 10-16 to 10-15 cm2/W. No two-photon absorption is observed. The experimental results are compared with two-parabolic band model for the bound electronic Kerr nonlinearity. It is found that the measured n2 values in (beta) BaB2O4 and LiB3O5 are one order of magnitude smaller than those of LiNbO3:MgO, KtiOAsO4,KtiOPO4, which is in agreement with the theoretical prediction.
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He Ping Li, Chan Hin Kam, Yee Loy Lam, and Wei Ji "Femtosecond Z-scan measurements of nonlinear refraction in second-harmonic-generation crystals", Proc. SPIE 4221, Optical Measurement and Nondestructive Testing: Techniques and Applications, (9 October 2000); https://doi.org/10.1117/12.402582
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