Growth and characterization of a single crystal of Urea Adipic acid (UAA) – A third order nonlinear optical material

• The various properties of urea-adipic acid (UAA) crystals are reported for the first time.
• The UAA crystal was grown in methanol solvent.
• From the UV–visible spectral studies, various optical constants were determined.
• Z-scan measurements reveal the aptness of crystal for third order NLO application.

An organic single crystal of Urea Adipic acid (UAA) was successfully grown in methanol solvent by slow solvent evaporation technique at room temperature (30 °C). The structure of grown crystal was elucidated from the X-ray diffraction study and it belongs to monoclinic system with centrosymmetric space group P21/c. The optical transmission spectrum of UAA has been recorded and its theoretical calculations were carried out to determine the linear optical constants such as linear absorption coefficient, extinction coefficient, refractive index and reflectance etc. The third-order nonlinearities of UAA crystal have been investigated by Z-scan method. The values of nonlinear refractive index (n2), the absorption coefficient (β) and third-order nonlinear susceptibility (χ(3)) are found to be the order of 0.96 × 10−10 cm2/W, 1.248 × 10−4 cm/W and 6.44 × 10−8 esu respectively. Fourier Transform Infra Red and Raman spectroscopy studies reveal the intermolecular interactions present in the UAA sample. The dielectric and mechanical measurements of the title compound are also reported.

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