Growth and optical properties of mercury thiogallate

An investigation was made of the phase diagram of the HgS–HgGa₂S₄ system. It was shown that there is a region of HgGa₂S₄-based solid solutions. Optically homogeneous mercury thiogallate single crystals were grown and used to measure the refractive indices in the 0.55–11 μ range. A phase-matching diagram was plotted for an o + o→e frequency mixing process. This diagram confirmed phase-matched interaction in the specified wave-length range.