Abstract
Homogeneous single crystals of mercury thiogallate HgGa2S4 were grown. Their diameter and length were 12 mm and 40 mm, respectively; the absorption coefficient was of the order of 0.1 cm−1. The nonlinear susceptibility coefficients d36(HgGa2S4) = 1.8d36(AgGaS2) and d31(HgGa2S4) = 0.6d36(AgGaS2) were determined.