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<p>Organic single crystals of R-mandelic acid S-alanine hemihydrate (MASAH) were successfully grown by the slow evaporation technique. Single crystal and powder X-ray diffraction analyses confirm that the crystal belongs to the triclinic system with a non-centrosymmetric space group P1. The grown crystal exhibits good optical transparency in the visible region with a lower cut-off wavelength of 272&#xa0;nm and an optical bandgap of 4.2&#xa0;eV. Fourier transform infrared (FTIR) and Nuclear magnetic resonance (NMR) analyses confirm the presence of functional groups and molecular structure. Thermal analysis reveals that the crystal is stable up to 102&#xa0;°C. The Second harmonic generation (SHG) efficiency of MASAH is found to be 0.93 times that of Potassium dihydrogen phosphate (KDP). Z-scan studies indicate a positive nonlinear refractive index and significant third-order nonlinear optical response. Unlike earlier reports limited to structural analysis, the present work establishes the optical and nonlinear optical properties of MASAH. Compared to conventional amino acid crystals such as glycine and L-alanine, the enhanced nonlinear response is attributed to π-electron contribution and intermolecular interactions.</p>

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Exploring the growth and characterization of R mandelic acid S-alanine hemihydrate for nonlinear optical and optical limiting applications

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • K. Sivakumar,
  • R. Rishwantthi,
  • P. Umarani

摘要

Organic single crystals of R-mandelic acid S-alanine hemihydrate (MASAH) were successfully grown by the slow evaporation technique. Single crystal and powder X-ray diffraction analyses confirm that the crystal belongs to the triclinic system with a non-centrosymmetric space group P1. The grown crystal exhibits good optical transparency in the visible region with a lower cut-off wavelength of 272 nm and an optical bandgap of 4.2 eV. Fourier transform infrared (FTIR) and Nuclear magnetic resonance (NMR) analyses confirm the presence of functional groups and molecular structure. Thermal analysis reveals that the crystal is stable up to 102 °C. The Second harmonic generation (SHG) efficiency of MASAH is found to be 0.93 times that of Potassium dihydrogen phosphate (KDP). Z-scan studies indicate a positive nonlinear refractive index and significant third-order nonlinear optical response. Unlike earlier reports limited to structural analysis, the present work establishes the optical and nonlinear optical properties of MASAH. Compared to conventional amino acid crystals such as glycine and L-alanine, the enhanced nonlinear response is attributed to π-electron contribution and intermolecular interactions.