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Lasers which use a solid, as opposed to a liquid or gas, as the lasing medium. Common materials used are crystals, such as Yag (Yttrium aluminum garnet); alexandrite; and Corundum, doped with a rare earth element such as a Neodymium; Erbium; or Holmium. The output is sometimes additionally modified by addition of non-linear optical materials such as potassium titanyl phosphate crystal, which for example is used with neodymium Yag lasers to convert the output light to the visible range.
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