Recently, the newly developed Z-scan technique has been widely used as a simple but accurate and sensitive tool for determining nonlinear refraction and absorption in a single-beam, single-wavelength geometry.1 Here we introduce a simple dual-wavelength extension of this technique for measuring changes of refraction as well as absorption induced by a strong pump on a weak probe at a different wavelength. Although, in general, pump and probes of arbitrary wavelengths can be implemented, we experimentally demonstrate this technique when the probe beam is the second harmonic of the pump beam.

© 1991 Optical Society of America

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