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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The CA z-scan measurements of the Au NP sample with a concentration of 4 mg/L for different average powers that ranged from 0.8 to 1.6 W (a–e) at a constant excitation wavelength of 800 nm.