Using z-scan technique one can get both nonlinear absorption (NLA) and nonlinear refraction (NLR) measurements of the samples simultaneously.
The pure nonlinear refraction traces of POA and PPy samples are shown in Fig.
The samples were characterized with negative nonlinear refraction (self-defocusing) property.
Traveltime Tomography, Geophysics, 63, no.
In this work, parameters such as linear absorption factor, thermal conductivity, thermo-optical and nonlinear refraction
factors of silver nanoparticles were measured," she said, adding, "It was observed that the increase in nanoparticles' concentration improved the linear and nonlinear optical refraction of the nanoparticles.
The typical Z-scan data with fully open aperture is insensitive to nonlinear refraction
(NLR) and therefore the data are expected to be symmetric with respect to the focus.
This technique enables simultaneous measurement of nonlinear refraction (NLR) and non-linear absorption (NLA).
The peak-valley shape of the curve indicates negative nonlinear refraction.