Femtosecond Z-scan measurements of nonlinear refraction in second-harmonic-generation crystals

He Ping Li; Chan Hin Kam; Yee Loy Lam; Wei Ji

doi:10.1117/12.402582

9 October 2000 Femtosecond Z-scan measurements of nonlinear refraction in second-harmonic-generation crystals

He Ping Li, Chan Hin Kam, Yee Loy Lam, Wei Ji

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.

Citation Download Citation

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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