| Autor: |
W. Wilson, L.M. Demianets, Gordon A. Thomas, P.M. Bridenbaugh, James O. Eckert, Richard E. Riman, R.A. Laudise, G. Nykolak |
| Rok vydání: |
1994 |
| Předmět: |
|
| Zdroj: |
Journal of Crystal Growth. 144:243-252 |
| ISSN: |
0022-0248 |
| Popis: |
The hydrothermal phase equilibria of the KF-GdF 3 -H 2 O system were studied at a temperature of 450°C and 10 kpsi. Crystals of K 2 GdF 5 , KGdF 4 and KGd 2 F 7 were grown. The fluorides were found to be stable only with excess KF in solution. Research was subsequently focused on KGdF 4 synthesis, a potential material for 1.3 μm optical amplifiers when doped with Pr and Yb. Solubility and P-V-T measurements were used to determine conditions for the formation of KGdF 4 single crystals doped with either Pr or Pr + Yb. Absorbance and fluorescence of these crystals are reported and compared with those for heavy metal fluoride glasses. These dopants were chosen in order to produce luminescence at a wavelength of 1.3 μm, an important wavelength for optical amplifiers for optical fiber communication. Energy transfer from Yb to Pr was demonstrated and concentration quenching occurred only at ∼ 10X the concentration seen for rare earths in glass hosts. The results can be used as a guide for co-doping other fluorides and for growing larger crystals of KGdF 4 . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
