Ytterbium doped yttrium aluminium garnet (Yb:YAG)

Yb doped Yttrium aluminium garnet (Yb: YAG) is made of Yttrium aluminium garnet (YAG, Yttrium Aluminum Garnet) crystal doped with ytterbium (Yb). The lattice structure of Yb: YAG crystal is similar to that of YAG crystal, with yttrium ions replacing some of the yttrium ions in the lattice. The ytterbium ion is similar to the yttrium Ionic radius in the lattice, so it can be well absorbed by the crystal. Yb: YAG crystals have several important properties. Firstly, ytterbium ions (Yb ^ 3+) have two main energy levels, which means that Yb: YAG crystals have faster particle inversion during laser operation and are easier to achieve. Secondly, the absorption and emission wavelengths of Yb: YAG crystals are in the near-infrared region, which matches the output wavelength of many high-power continuous wave (CW) lasers and semiconductor lasers. In addition, the upconversion fluorescence of Yb: YAG is very small and almost negligible, which makes its thermal effect small in high-power applications. Yb: YAG crystals are widely used in solid-state lasers. Due to its excellent physical and chemical properties, as well as its matching with many laser output wavelengths, Yb: YAG crystals have been widely used in laser systems in the fields of material processing, medical equipment, military and scientific research. In addition, Yb: YAG crystals are also used in fiber lasers and fiber amplifiers, among which fiber lasers have received widespread attention due to their compact structure, high efficiency, and good tunability.

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