Articles written in Bulletin of Materials Science

    • Third-order optical nonlinearity and power limiting characteristics of acid green 3 dye


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      Third-order optical nonlinearity and optical limiting (OL) characteristics of an organic dye acid green 3 (AG 3) dye in water has been studied using a 635 nm diode laser of 5 mW power. The UV–visible absorption studies were carried out to understand the linear optical properties of acid green 3 dye. The recorded Fourier transform infrared spectra of acid green 3 dye reveals that the ${\pi}$-electrons are delocalized through intermolecular charge transfer (ICT) within theN-ethyl–sodium sulphite bonds, which lead to measurable polarization across the push–pull molecules. The structural properties and crystalline size of the acid green 3 dye were examined by X-ray diffraction spectra. The third-order nonlinear optical (NLO) parameters such as nonlinear absorption coefficient (${\beta}$) and nonlinear refractive index ($n_2$) were determined by performing the open aperture Z-scan and closed aperture Z-scan experiments, respectively. The reverse saturable absorption and self-defocusing type optical nonlinearity were observed for acid green 3 dye. The experiments were also performed to understand the OL characteristics of acid green 3 dye and obtained a low limiting threshold of 1.23${\times}$10$^2$ W cm$^{–2}$. The results of present experimental study reveal that acid green 3 dye possess good NLO properties and this dye system may be suitable for applications in low power NLO and photonic devices.

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