Kyropoulos

The Kyropoulos process was developed by Spyro Kyropoulos to grow single crystals of alkaline halides. To initiate growth a cooled seed or shaft is dipped into the melt and the furnace temperature slowly cooled to encourage the downward growth of the crystal into the melt. Submerged growth like this allows the crystal to growth in a shallower thermal gradient than the Czochralski process. The shallower thermal gradient is important for thermally sensitive scintillator and semiconductor crystals that are prone to fracture. The schematic in Figure 12 shows a crystal being grown by this technique.

A schematic showing a crystal being grown with the Kyropoulos process.