# US 2021/0276915 A1 · Highly transmissive glasses with high solarisation resistance, use thereof and method for production thereof

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- Number: US 2021/0276915 A1
- Document ID: US20210276915A1
- Status: Published application
- Kind: A1
- Application number: 17/327,245
- Filed: 2021-05-21
- Published: 2021-09-09
- Earliest claimed: 2012-01-12
- Assignees: Schott AG
- Applicants: Schott AG
- Inventors: Simone Ritter; Uwe Kolberg; Stefanie Hansen; Thomas Weingaertner; Caroline de Luca; Thomas Kirsch; Peter-Franz Skiba
- Web page: https://patentgrep.com/patent/US20210276915A1

## CPC

- C03C 13/046: {Multicomponent glass compositions}
- C03B 5/193: using gas, e.g. bubblers
- C03B 5/225: Refining (C03B5/18 takes precedence {; Refining agents C03C1/004})
- C03C 3/066: containing zinc
- C03C 3/068: containing rare earths
- C03C 3/078: containing an oxide of a divalent metal, e.g. an oxide of zinc
- C03C 3/089: containing boron
- C03C 3/091: containing aluminium
- C03C 3/095: containing rare earths
- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 3/118: containing aluminium
- G02B 6/02: Optical fibres with cladding {with or without a coating}
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Glasses are provided that are highly transparent and have very good resistance to solarization. The resistance to solarization is favored to a special extent by 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.

## Claims

### Claim 1

A glass having an attenuation of 1300 dB/km at a wavelength of 1050 nm, the glass comprising the following components in the amounts indicated in % by weight:
from
to
B2O3
0
24
SiO2
23
62.1
Al2O3
0
10
Li2O
0
10
Na2O
0
18.5
K2O
0
25.7
MgO
0
8
CaO
0
8
SrO
0
24.4
BaO
0
57.8
ZnO
0
40
La2O3
0
25
ZrO2
0
10
Ta2O5
0
22
Sum of the alkaline earth
18
55
content (RO) and ZnO

### Claim 2 (depends on 1)

The glass according to claim 1, wherein B2O3 is at most 15% by weight of the glass.

### Claim 3 (depends on 1)

The glass according to claim 1, wherein SiO2 is at most 50% by weight of the glass.

### Claim 4 (depends on 1)

The glass according to claim 1, wherein Al2O3 is up to 6% by weight of the glass.

### Claim 5 (depends on 1)

The glass according to claim 1, wherein Na2O is up to 9% by weight of the glass.

### Claim 6 (depends on 1)

The glass according to claim 1, wherein K2O is at most 3% by weight of the glass.

### Claim 7 (depends on 1)

The glass according to claim 1, wherein the portion of alkali oxides is at most 10% by weight of the glass.

### Claim 8 (depends on 1)

The glass according to claim 1, wherein MgO is up to 3% by weight and/or CaO is up to 2% by weight of the glass.

### Claim 9 (depends on 1)

The glass according to claim 1, wherein SrO is up to 4% by weight of the glass.

### Claim 10 (depends on 1)

The glass according to claim 1, wherein BaO is at least 11% by weight of the glass.

### Claim 11 (depends on 1)

The glass according to claim 1, wherein ZnO is at most 22% by weight of the glass.

### Claim 12 (depends on 1)

The glass according to claim 1, wherein La2O3 is at least 4% by weight and at most 21% by weight of the glass.

### Claim 13 (depends on 1)

The glass according to claim 1, wherein ZrO2 does not exceed 6% by weight of the glass.

### Claim 14 (depends on 1)

The glass according to claim 1, wherein the total content of the alkaline earth (RO) and ZnO is from 21% by weight to 48% by weight of the glass.

### Claim 15 (depends on 1)

The glass according to claim 1, wherein the total content of SiO2, Al2O3 and B2O3 is at least 25% by weight and at most 50% by weight of the glass.

### Claim 16 (depends on 1)

The glass according to claim 1, wherein the total content of the alkaline earth oxides does not exceed a value of 42% by weight of the glass.

### Claim 17 (depends on 1)

The glass according to claim 1, wherein the mass ratio of BaO to ZnO is at least 0.5.

### Claim 18 (depends on 1)

The glass according to claim 1, wherein Nb2O5 is up to at most 0.5% by weight of the glass.

### Claim 19 (depends on 1)

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

### Claim 20 (depends on 1)

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