By using silica gel as a medium, the inorganic crystals of Cadmium doped Zinc Hydrogen Phosphate was successfully grown on single diffusion technique. The crystals were grown for different gel densities and various concentrations of orthoposphoric acid. Nonlinear optics has been focused in recent times due to their new phenomena, new theoretical insights, new materials and devices. Mostly nonlinear optics researches are mainly focused on energy materials exhibiting second and third order harmonics generations. The effect of various growth parameters on the nucleation rate of these crystals was studied. TG/DTA analysis, Energy dispersive X-ray analysis (EDAX), Laser Raman spectroscopy, Photoluminescence and Non Linear Optical studies (NLO) have been made to find the stoichiometric composition of the crystals and its structure. The presence of various functional groups was confirmed from Laser Raman spectra and the effect of composition of the crystals on the spectra was identified. Photoluminescence spectrophotometric experiments were carried out to study the optical properties of the grown crystals. Thermal analysis is undertaken to study the thermal stability of the grown crystals. The chemical composition of Cadmium doped zinc hydrogen phosphate crystal was determined by EDAX analyses. The NLO studies discloses that they are capable of realizing green light and their second harmonic efficiency is 1.2 times greater than that of KDP. The optical damage studies have also been carried out on the grown crystals