Rutile-structured nanocrystalline tin dioxide (SnO 2 ) powder was synthesized by the chemical precipitation method using the precursor SnCl 2 • 5H 2 O. The SnO 2 powder was annealed at different temperatures, namely, 600, 800 and 1000 • C. Micro-Raman spectra were recorded for both the as-grown and annealed SnO 2 nanocrystalline samples. Micro-Raman spectral measurements on the SnO 2 nanoparticle show the first-order Raman modes A 1g (633 cm −1 ), E 1g (475 cm −1 ) and B 2g (775 cm −1 ), indicating that the grown SnO 2 belongs to the rutile structure. The first-order A 1g mode is observed as an intense band, whereas the other two modes show low intensity. The full width at half-maximum and band area of the Raman lines of SnO 2 nanoparticle annealed at various temperatures were calculated. The effect of high-temperature annealing on the vibrational modes of SnO 2 was studied. The optical image of SnO 2 nanocrystalline material was used to understand the surface morphology effect.

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An organic nonlinear optical centric single crystal, sulphanilic acid monohydrate (SAM) was successfully grown by slow evaporation method. The cell parameters of the grown crystal were assessed by single crystal XRD. The UV absorption edge was found to be 249[Formula: see text]nm providing a wide optical transmittance covering the visible region. The thermal, mechanical and dielectric properties of the grown crystal were examined. Fluorescence emission spectrum was recorded and lifetime was studied. A multiple shot laser technique was adopted to investigate the surface laser damage of the crystal. The third-order nonlinear optical characteristics of the grown crystal, investigated by [Formula: see text]-scan technique attest its suitability in the field of nonlinear optical applications.

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