My first laser 1968 a ruby laser of 22 Joules 1 ms

In 1968 i build this ruby laser (this was my first laser). I received a second prize in physics au concours La Science Appelle les Jeunes in Switzerland. The ruby rod is doped with 0. 05 Cr2O3 diameter 12. 7 mm and 125 mm long. The flash lamp is a Verres et Quartz 5 kJ in 2 miliseconds. The output beam is multimode with 22 joules Goto A ruby laser most often consists of a ruby rod that must be pumped with very high energy, usually from a flashtube, to achieve a population inve