The chemical element of atomic number 69, a soft silvery-white metal of the lanthanide series. (Symbol: Tm)
- Each segment contains small amounts of ions of relatively rare metals, such as dysprosium, thulium, and cerium, which fluoresce in different colors.
- The pure metal can be produced by treating thulium fluoride with calcium metal.
- The main rare-earth ions used are thulium (for devices operating at 1450 to 1510 nm) and erbium.
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