Single crystals of pure and doped L-Arginine maleate (LArM) were grown successfully by slow evaporation technique. In the present study, to improve the device characteristics of LArM crystals, metal dopant was incorporated into the pure crystals. The grown pure and doped LArM crystals were confirmed by X-ray powder diffraction studies. The pure and doped crystals were characterized by Fourier Transform Infrared (FT-IR). Absorptions of the grown crystals were analyzed using UV-Vis-NIR studies. Nonlinear optical studies of pure and doped crystals were carried out and it revealed that the dopant has increased the efficiency of the pure crystal