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O− centre formation in YAG crystals doped with rare earth ions

✍ Scribed by Dr. Jiří Kvapil; Josef Kvapil; Bohumil Perner

Publisher
John Wiley and Sons
Year
1975
Tongue
English
Weight
316 KB
Volume
10
Category
Article
ISSN
0232-1300

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✦ Synopsis

Abstract

Colour changes of YAG crystals doped with rare earth ions and annealed in hydrogen, oxygen, vacuum or argon are described. The influence of UV irradiation is also given. Some crystals were further doped with Ca, Sr, Ba, or Cr, respectively. Yellow or brown colouring of the crystals is attributed to the O^−^ centre formation which causes an increase of the absorption peak at 395–410 nm. Most intensive colouring showed the crystals containing a combination of Yb or Eu with Nd or Cr after oxygen annealing followed by UV irradiation.

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✍ Dr. Jiří Kvapil; Josef Kvapil; Bohumil Perner; Břetislav Mánek 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 394 KB

## Abstract The colour changes of YAG crystals doped with Ti, V, Cr, Mn, Fe, Co and Ni as well as those doped with Mg or Be are described. The comparison of samples annealed in hydrogen oxygen and argon and exposed to an UV irradiation is given. Yellow or brown colour of YAG crystals is attributed