Abstract

A phase-object (PO) Z-scan technique, which can conveniently distinguish the transient thermal-lensing effect from the third-order nonlinear refraction, is described. The PO Z-scan trace of the transient thermal-lensing effect shows a valley–peak shape that is very different from the single-valley (peak) shape of the pure negative (positive) third-order nonlinearity. The nonlinear refraction of the C70/toluene solution is investigated by using the PO Z scan with 8ns pulses at 532nm wavelength as a test.

© 2009 Optical Society of America

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