Tetravalent chromium (Cr4+) as a laser-active ion for tunabale solid-state lasers

摘要

A laser-medium in the form of a dielectric crystal or glass doped with tetravalent chromium. The dielectric crystals are of olivine-like structure such as germanates of formula (A) (RE)GeO4 where (A=Na or Li, RE=Y, Lu or Gd), crystals of willemite structure Zn2(Si or Ge)O4 tetrahedral sites, or any other single-crystal or polycrystalline compound containing the (Si.Ge)O4 tetrahedra in its crystal lattice, such as Ca3La2(SiO4)6 and crystals such as YAG (Y3Al5O12).