Single crystals of Yttrium doped sulphamic acid (Y : SA) were grown from aqueous solutions by slow evaporation technique. Structural characterization of the grown crystals has been carried out by powder and single crystal X-ray diffraction (XRD) methods. (Y : SA) crystals crystallize in tetragonal structure. Second harmonic generation (SHG) for the material of this work was confirmed using Nd : YAG laser. The UV-Visible spectrum showed that the grown crystals have wide optical transparency in the entire visible region. The thermal stability of the crystal has been indentified by thermal studies
