A review is given of the development of laser glass. The fluorescence and laser effect of numerous glass compositions has been investigated in the last twenty years. But the industrial application is small in comparison to the research volume: between 20 and 30 glass types are available commercially today. Phosphate glasses are in the foreground nowadays, because they have a high laser effect and it is possible to produce them in large volumes and with high damage threshold. They are used for high power lasers and lasers for materials working and measuring technique.