Method for the production of glasses containing bismuth oxide
The invention relates to a method for the production of a glass containing bismuth oxide, the use of such a method for the production of optical glasses, in particular glasses for application in optical telecommunications and a glass which may be produced by said method.
1 . A process for producing a glass containing bismuth oxide, characterized in that during the melting operation oxygen is blown into the melt.
2 . The process as claimed in claim 1 , in which dried oxygen is blown into the melt.
3 . The process as claimed in claim 1 or 2 , in which halogenated oxygen is blown into the melt.
4 . The process as claimed in one of the preceding claims, in which a glass composition of the following composition is melted:
Bi 2 O 3
≧10
Mol %
further oxides
0 to 90
Mol %
rare earth compound
0 to 8
Mol % (based on oxide).
5 . The process as claimed in one of the preceding claims, in which a glass composition of the following composition (in Mol %) is melted:
Bi 2 O 3
30-60
SiO 2
0-60
GeO 2
0-30
B 2 O 3
0-60
Al 2 O 3
0-50
Ga 2 O 3
0-50
In 2 O 3
0-30
WO 3
0-30
MoO 3
0-30
Nb 2 O 5
0-30
Sb 2 O 3
0-30
Ta 2 O 5
0-15
TiO 2
0-30
ZrO 2
0-30
SnO 2
0-40
M I 2 O
0-40
M II O
0-30
F and/or Cl
0-10
SiO 2 + GeO 2
0.5-60
B 2 O 3 + Al 2 O 3 + Ga 2 O 3
0.5-60
rare earth compound
0.005-8 (based on
oxide)
where M I is at least one of Li, Na, K, Rb, Cs, and M II is at least one of Be, Mg, Ca, Sr, Ba and/or Zn.
6 . The process as claimed in claim 4 or 5 , in which the rare earth compound used is Er.
7 . The use of the process as claimed in one of claims 1 to 6 for the production of optical glasses.
8 . The use as claimed in claim 7 for the production of glasses for optical communication technology.
9 . The use as claimed in claim 7 or 8 for the production of glasses for optical amplifier media, such as fiber amplifiers and planar amplifiers.
10 . A glass, producible by the process as claimed in one of claims 1 to 6 .