Abstract. Semi-Organic Magnesium Sulfate-doped L-Leucinium oxalate (MSLO) single crystal was grown using slow evaporation method. Structure of the crystal was determined by single-crystal X-Ray Diffraction (XRD). Lattice parameters of MSLO crystal were determined. Optical transmittance study was carried out to find various linear optical parameters like band gap, reflectance, refractive index, absorption coefficient, extinction coefficient, optical conductivity. Vickers Microhardness study was carried out to find mechanical properties such as hardness, work hardening coefficient, brittleness index and fracture toughness of the grown MSLO crystal. Kurtz-Perry powder technique with Nd: YAG laser was applied to study the second harmonic generation (SHG) competency. By using Z-scan technique, third-order NLO efficiency of MSLO crystal was calculated. LDT study was also done for MSLO crystal. It is observed that magnesium sulfate-doped L-leucinium oxalate (MSLO) crystal has the superior properties compared to that of undoped L-leucinium oxalate crystal. EDS studies were conducted for MSLO crystal to check the elements present in the crystal.

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