SZLASER offers different types of Crystals. Laser crystals are optical crystals – typically single crystals (monocrystalline optical materials) – which are used as gain media for solid-state lasers. In most cases, they are doped with either trivalent rare earth ions or transition metal ions. These ions enable the crystal to amplify light at the laser wavelength via stimulated emission, when energy is supplied to the crystal via absorption of pump light.