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Proceedings Paper

Femtosecond Z-scan measurements of nonlinear refraction in second-harmonic-generation crystals
Author(s): He Ping Li; Chan Hin Kam; Yee Loy Lam; Wei Ji
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Paper 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.

Paper Details

Date Published: 9 October 2000
PDF: 5 pages
Proc. SPIE 4221, Optical Measurement and Nondestructive Testing: Techniques and Applications, (9 October 2000); doi: 10.1117/12.402582
Show Author Affiliations
He Ping Li, Nanyang Technological Univ. (Singapore)
Chan Hin Kam, Nanyang Technological Univ. (Singapore)
Yee Loy Lam, Nanyang Technological Univ. (Singapore)
Wei Ji, National Univ. of Singapore (Singapore)

Published in SPIE Proceedings Vol. 4221:
Optical Measurement and Nondestructive Testing: Techniques and Applications
FeiJun Song; Frank Chen; Michael Y.Y. Hung; H.M. Shang, Editor(s)

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