Studies on growth and characterization of Triglycine acetate (TGAc) NLO single crystals

Triglycine acetate belongs to amino acid group revealing non-linear optical property. Single crystals of Triglycine acetate (TGAc) have been grown by slow evaporation of solution at 30 degrees C. Single crystal X-ray diffraction analysis reveals that the crystal belongs to monoclinic system. The optical absorption studies show that the crystal is transparent in the entire visible region with a cut off wavelength of 250 nm. The optical band gap is found to be 4.60 eV. The dependence of extinction coefficient (K) and refractive index (n) on wavelength has also been reported. Mechanical studies were carried out on the as grown crystal. The dielectric studies show that the dielectric constant and dielectric loss decrease exponentially with frequency at room temperature. Photoconductivity study confirms the negative photoconducting nature of the crystal which confirms the high degree of transparency of the material.