Single crystals of glycinium oxalate (GLO) are grown by solution growth technique. The Z scan technique is used to elucidate the third order nonlinearity in the material. The results indicate that the compound exhibits reverse saturable absorption (RSA) and self-defocusing performance. The second harmonic generation (SHG) efficiency of the crystal evaluated by Kurtz and Perry technique is compared with that of the standard KDP crystal. Attempt is made to correlate the SHG efficiency with the crystalline perfection in the material.There is considerable interest in finding materials with large yet fast nonlinearity. This interest is driven primarily by the search for materials for all-optical switching and sensor protection applications, and both nonlinear absorption (NLA) and nonlinear refraction (NLR) are concerned. The Z-scan technique is a method which can measure both NLA and NLR in solids particularly in liquids and liquid solutions [1,2] , and has gained rapid acceptance as a standard technique for separately determining the nonlinear changes in index of refraction and changes in absorption. This acceptance is primarily due to the simplicity of the technique as well as the simplicity of the interpretation. The index change n and the absorption change can be determined directly from the data without resorting to fitting.Amino acid crystals with delocalized electrons usually display large nonlinear optical (NLO) response and are potential candidates for applications in the emerging areas of photonics [3] . Most of such crystals are composed of dipolar aromatic molecules, which exhibit intramolecular charge transfer. Molecules, which show asymmetric polarization induced by electron donor and acceptor groups, are responsible for electro-optic and NLO properties [4,5] . The charge transfer compound of glycine and oxalic acid-glycinium oxalate (GLO) is a potential NLO material [6] . In this work, the glycinium oxalate (GLO) is synthesized from aqueous solutions of glycine and oxalic acid taken in 1:1 molar ratio. The seed crystal prepared using the synthesized powder is top seeded in its saturated solution at 28 0 C, which yields good optical quality in three weeks (Fig.
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