The third order nonlinear optical single crystal of Sulphamic Acid Lithium Chloride (SALC) was grown by slow evaporation method at room temperature. The grown single crystal was characterized by single crystal X-ray Diffraction (XRD) analysis; it confirms the crystal belongs to the orthorhombic system. The vibrational mode of SALC was identified by Fourier Transform Infrared (FTIR) spectral analysis. UV-Vis-NIR absorption studies were performed to know the optical behaviour of the SALC single crystal. The response of the dielectrics studies with respect to the frequency range of 50 Hz to 5 MHz has been investigated and results are discussed. Further the Third order nonlinearities of the SALC crystal was studied by Z-scan techniques. The values of non-linear refractive index (n2), absorption coefficient (β), and third order non-linear susceptibility (χ3) were found.