Abstract

We report general characteristics of on-axis Z-scan transmittance for arbitrary circularly symmetric beams. Some experimental results are presented for a nearly top-hat-shaped beam and for a trimmed Airy beam whose electric field profile is the central portion of an Airy function inside its first zero. The sensitivity of Z-scan method with a trimmed Airy beam for measuring an induced index-of-refraction change is a factor of 1.5 greater than that of a Gaussian beam. Also, it is found that there are some advantages of experimental alignment and numerical convergence for a Z-scan measurement that uses a trimmed Airy beam over one that uses a top-hat beam.

© 1996 Optical Society of America

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