Erbium doped yttrium aluminium garnet (Er:YAG)

Erbium doped Yttrium aluminium garnet (Er: YAG) is made of Yttrium aluminium garnet (YAG) crystal doped with erbium element (Er). Er: The foundation of YAG crystal is YAG crystal, which is a crystal material with a cubic crystal structure. The yttrium ions in YAG are partially replaced with erbium ions, forming erbium doped YAG crystals. Erbium ions are uniformly distributed in the crystal and can provide uniform gain in the laser. Er: YAG has become an important material in the field of laser technology due to its excellent optical performance and wide range of applications. For eye safe emission at wavelengths 1617 and 1645 nm, it can be pumped into the upper laser manifold through diode resonance at 1470 nm and 1532 nm. Due to the low quantum defects, high Slope efficiency of more than 80% can be obtained by direct fiber laser or InGaAs/InP pump. By using heavily doped erbium (~50at.%) YAG crystals, an efficient continuous laser operation of~3 µ m can be achieved.

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