Highly transmissive glasses with high solarisation resistance, use thereof and method for production thereof

Patent metadata

Field	Value
Publication number	US-10759692-B2
Application number	US-201816233529-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Jan 12, 2012
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

The glasses of the present disclosure are highly transparent and have very good resistance to solarization. The resistance to solarization arises from the production method. The concentrations of reduced polyvalent ion species are reduced by targeted use of bubbling with an oxidizing gas. Methods for producing glasses and to the uses thereof, particularly as core glasses in optical waveguides, are also provided.

First claim

What is claimed is:

1. A glass having improved solarization resistance comprising SnO 2 and having an attenuation of ≥1300 dB/km at a wavelength of 1050 nm, the glass comprising the following components in the amounts indicated in percent by weight:

from
To

SiO 2
35
55

Al 2 O 3
0
2.8

BaO
0
12.8

ZnO
16
28

La 2 O 3
5
21

ZrO 2
1
8

SnO 2
>0
2

Σ R 2 O
6
18

wherein R 2 O is the sum of the contents of all alkali metal oxides.

2. The glass according to claim 1 , wherein the attenuation at a wavelength of 1050 nm is <400 dB/km.

3. The glass according to claim 1 , wherein the attenuation at a wavelength of 1050 nm is from 400 to 1300 dB/km.

4. The glass according to claim 1 , wherein the glass comprises Fe 2+ and/or Fe 3+ in a content of 0 to 10 ppm.

5. The glass according to claim 1 , wherein the glass contains MnO in a concentration of <200 ppb.

6. The glass according to claim 1 , wherein the glass contains MnO in a concentration of 200 to 500 ppb.

7. The glass according to claim 1 , wherein the glass is free of PbO, As 2 O 3 and Sb 2 O 3 .

8. The glass according to claim 1 , wherein the glass is free of B 2 O 3 .

9. The glass according to claim 1 , wherein the glass is free of TiO 2 .

10. The glass according to claim 1 , wherein the glass is free of Ag 2 O.

11. The glass according to claim 1 , further comprising HfO 2 in an amount of at least 0.02% by weight.

12. The glass according to claim 1 , wherein the glass further comprises the following components in the amounts indicated in percent by weight:

from
To

SiO 2
35
53

Al 2 O 3
0
1.5

Li 2 O
0.2
<3

Na 2 O
2
9

K 2 O
0.9
12

HfO 2
0.02
1.5

MgO
0
8

CaO
0
8

SrO
0
4

Ta 2 O 5
0
6

Y 2 O 3
0
11.9

Rb 2 O
0
1.5

Cs 2 O
0
1.5

GeO 2
0
3

F
0
2

Σ R 2 O
6
15

Σ MgO, CaO, SrO, ZnO
20
42.

13. The glass according to claim 1 , further comprising an amount of Sn 2+ of at most 5%, based on the total content of tin.

14. The glass according to claim 1 , further comprising a content of SnO 2 of at least 0.01 and at most 1% by weight.

15. A method for the production of the glass of claim 1 , comprising the steps of:
melting the glass mixture in a melting vessel; and
refining the melt in a refining vessel.

16. An optical fiber comprising:
the glass according to claim 1 as a core glass; and
a cladding glass sheathing the core glass.

17. A use of the glass according to claim 1 as a core glass in an optical fiber.

18. The glass according to claim 1 , wherein the mass ratio of BaO to ZnO is at least 0.01 and does not exceed a value of 2.5.

Assignees

• Schott Ag

Inventors

• Ritter Simone
• Kolberg Uwe
• Hansen Stefanie
• Weingaertner Thomas
• De Luca Caroline
• Kirsch Thomas
• Skiba Peter-Franz

Classifications

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• C03C3/068

  containing rare earths · CPC title

• C03C3/118

  containing aluminium · CPC title

• C03C3/066

  containing zinc · CPC title