Growth and characterisation of organic nonlinear optical single-crystal 4-nitrophenol grown by vertical Bridgman technique
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An organic nonlinear optical single-crystal 4-nitrophenol was successfully grown by vertical Bridgman technique using single-wall ampule in size of 38 × 15 mm2. The lattice parameters and crystallinity of the title crystal were confirmed through the single crystal and powder X-ray diffraction studies, respectively. The UV–Vis–NIR spectral analysis addressed that the title crystal has a lower optical cut-off wavelength at 405 nm and exhibits transparency of 82% in entire visible and near-IR regions with a wide band gap of 2.84 eV. The hardness, Meyer’s index, stiffness constant, yield strength, fracture toughness, and brittle index of the grown specimen were systematically investigated using a Vickers microhardness tester. The low value of dielectric constant and dielectric loss for the present crystal enrolls that it is well suitable for microelectronic industry. The laser-induced damage threshold value of the grown specimen is found to be 17.66 GW/cm2. The Z-scan measurement was employed to calculate the third-order nonlinear optical parameters of the title crystal.
The authors thank the management of VIT, Vellore, for providing excellent research facilities. The authors are very much thankful to SAIF, IIT Madras, for providing single crystal XRD.
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