Modern high temperature crystal growth is a science which was greatly developed during WWII for the growth of large pure silicone and germanium single crystals, desperately needed for the development of the essential RADAR systems. By the end of the war, the body of knowledge in high temperature crystal growth was large. In the early sixties the solid state laser was developed, followed by twenty years in which much effort was invested into growing laser crystals. By the beginning of 1980's researchers from the Fujian Institute of Research realized that the low temperature phase of barium...