Erbium-doped yttrium-scandium-gallium-garnet crystals (Er:YSGG) are used in solid-state lasers to generate radiation in the 3µm range and are used alongside the frequently used Er:YAG, Er:GGG and Er:YLF crystals. Flashlamp-pumped solid-state lasers based on Cr,Nd and Cr,Er doped YSGG crystals (Cr,Nd:_Y3Sc2Ga3O12 or Cr,Nd:YSGG or Cr,Er:_Y3Sc2Ga3O12 or Cr,Er:YSGG) have a higher efficiency than those systems based on Nd:YAG and Er:YAG. Active elements made of YSGG crystals are optimal for medium-power pulsed lasers with repetition rates in the tens of cycles. The advantages of YSGG crystals compared to YAG crystals are reduced at high powers or crystals due to the poor thermal properties of YSGG crystals.