The study of nonlinear optical properties of aqueous acid fuchsin dye and its optical power limiting using Z-Scan method

In this research effort, the nonlinear refraction (NLR) and nonlinear absorption (NLA) of Acid Fuchsin dye solution were measured using Z-scan technique. Both properties were measured through the application of open aperture and closed aperture Z-Scan measurements in order to analyse the relationship between different laser input fluences and on four different dye concentrations (0.03 mM, 0.05 mM, 0.10 mM, and 0.20 mM). The results showed that both; NLR, NLA and optical limiting properties were observed starting from 0.05 mM. There is a reduction in terms of its NLR value observed as the concentrations increased with 0.03 mM has the highest value of n2. It is shown that the increment of NLA value is also observed as the concentrations increased. The low optical limiting (OL) threshold is observed around 0.04 W under continuous wave (CW) 532 nm laser beam. This shows that acid fuchsin dye has the capability as an optical limiter in photonics applications.