Erbium-doped Yttrium Vanadate (Er:YVO4) is a laser crystal that is used as a gain medium in solid-state lasers. The crystal is created by doping yttrium vanadate (YVO4) with erbium ions (Er3+). When pumped with a suitable pump source, the crystal can produce laser light at a specific wavelength in the near-infrared region, typically around 1550 nm. This makes Er:YVO4 a popular choice for a variety of applications, including fiber optic communication systems, material processing, and medical therapy. The crystal has a high gain and excellent thermal stability, which makes it ideal for use in high-power laser systems.s