unidirectional <001> Pure and NaCl-doped triglycine sulfate (TGS) crystals were grown by SR method. The grown crystals were then studied by atomic absorbtion, optical transmission and Fourier Transform Infrared (FTIR) spectroscopy techniques, microhardness and surface etching techniques. The NaCl-doped TGS crystal showed higher transmission than the pure crystal in the entire UV-Vis. region. It was observed that the NaCl additive caused the growth rate of TGS crystal in the [001] direction to increase.