Ceramic laser gain media
In 1959, Dr. Coble was invented "translucent ceramics" where the light can
pass across. Different from single crystals transparent (or translucent)
ceramics is synthesized by the sintering method that is the similar
process for opaque chinas. From 1964 researchers have tried to use
ceramics as a laser gain media because of simple fabrication process
compared to the general crystal growth.