# Erbium oxide, Er2O3

Erbium oxide (Er2O3) is a compound that can exist in various forms, including solid and powder, and is noted for its broad transparency range from ultraviolet to infrared wavelengths. This feature makes it highly valuable in optical applications, such as the doping of optical fibers and laser crystals. Its high refractive index and low dispersion are also advantageous for the creation of anti-reflective coatings and other specialized optical components. One of its most notable applications is as a dopant in erbium-doped fiber amplifiers (EDFAs), which are integral to optical communications systems. Regardless of its physical form, erbium oxide's unique properties make it a vital material in a range of optical and telecommunication applications.

## Other names

- Erbium(III) oxide
- Dierbium trioxide

## External links

- Erbium(III) oxide - Wikipedia
- Dierbium trioxide - NIST Chemistry WebBook
- Erbium(III) oxide - PubChem