Regarding z-scan, while fitting open aperture data how can we get conformation that we are on a right track while calculating saturation intensity Is is it less then peak intensity or approximately same as peak intensity.
Last thing can we vary zo calculated value to some extend in case our fitting curve is not good
Z-scan.
It is not totally clear what you are referring to in your question. If you are referring to intense-field interactions and extracting saturation intensities of non-linear processes, you may refer to the following paper: "Z-scan method for nonlinear saturation intensity determination, using focused intense laser beams" (DOI: 10.1103/PhysRevA.90.053422)
Sir i want to know while fitting Z-scan data and calculating saturation intensity from fitting equation, i want to know how it varies with peak intensity, si mean since we fit z-scan data fr different peak intensities and for evey fit we get corresponding saturation intensity i want to know how saturation insity varies for low and high peak intensity...
I am still not sure I understand your question, but assuming you are talking about the method described in the mentioned paper, saturation intensities are a characteristic of a certain process, and do not vary with intensity, as long as the process can be described by a specific mechanism throughout the range of intensities. Nevertheless, varying the peak intensity while tuning "z", allows to extract the saturation intensity, which was shown to be related (by a simple factor of ~3) to the intensity of maximal yield for non-linear processes.
An analytical function may be found in: "Intense-Field Double Detachment of Electrostatically Bound F– (NF3 ) n Cluster Anions" (DOI: 10.1021/acs.jpca.5b11792)
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