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Open aperture z-scan transmission traces of all the samples; black, green, and red curves are for , , and samples, respectively. Dotted and solid curves are theoretical ones, considering 2PA and 3PA, respectively. The inset (a) shows the variation of with . The solid line represents the linear fit to the data which gives the slope , indicating 3PA process. The inset (b) shows the variation of with of ZnS QDs. The solid curve is theoretically fitted one considering 3PA saturation model of Ref. 12 . Symbols are experimental points in every case.
Closed aperture z-scan transmission traces at an intensity . Symbols are experimental points and solid curves are theoretically fitted ones following the method described in detail in Ref. 6 .
Nonlinear three-photon absorption and refraction coefficients, measured at 532 nm wavelength. The experimental error in each data is estimated to be 10%. , , and samples are undoped, 1% doped, and 2.5% doped ZnS QDs, respectively.
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