The third-order optical susceptibility of magnesium sulfite hexahydrate (MgSO<sub>3</sub>.6H<sub>2</sub>O) single crystal is experimentally studied by nonlinear laser spectroscopy. Third-harmonic generation (THG) and two-photon absorption (TPA) in this crystal are examined within the 600 - 1500 nm range by picosecond optical parametric oscillator (OPO). Some important characteristics of the crystal such as the THG efficiency, the value of the cubic susceptibility χ<sup>(3)</sup>, the dispersion of the third-order nonlinearity and the nonlinear refractive index (n<sub>2</sub>), are determined.
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