Z-scan measurement with a slit instead of a circular aperture is proposed and analyzed for an astigmatic Gaussian beam. This new technique can accurately determine not only the nonlinear refractive index but also the ellipticity and positions of x–y foci of the astigmatic beam.
© 2000 Optical Society of America
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(190.3270) Nonlinear optics : Kerr effect
(190.5940) Nonlinear optics : Self-action effects
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
Yong-Liang Huang and Chi-Kuang Sun, "Z-scan measurement with an astigmatic Gaussian beam," J. Opt. Soc. Am. B 17, 43-47 (2000)