R, T., K, R., K, M., S, R. and E, S. 2025. Exploring Second-Order Nonlinear Optical Performance in Oxyquinolinium 3-carboxypropanoate: A Combined Experimental and DFT Study. International Research Journal of Multidisciplinary Technovation. 7, 6 (Nov. 2025), 191–211. DOI:https://doi.org/10.54392/irjmt25612.