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(a) Experimental set-up for Z-scan measurements (L: Lens, O. A.: Open aperture, C. A.: Closed aperture, P. D.: Photodetector). (b)–(e) Measured Z-scan data overlaid with theoretical fittings. The top four figures show measurements taken at λ = 800 nm, while the bottom four figures show measurements at λ = 1570 nm. The figures in the left column are open-aperture Z-scan data, while the right column shows closed-aperture Z-scans.
