Cladding glass for solid-state lasers

Patent metadata

Field	Value
Publication number	US-10389079-B2
Application number	US-201715718307-A
Country	US
Kind code	B2
Filing date	Sep 28, 2017
Priority date	Sep 28, 2016
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

The present invention relates to a glass having a refractive index of at least 1.7 as well as the use of the glass as a cladding glass of a solid-state laser. The invention also relates to a laser component comprising a core of doped sapphire and a cladding glass being placed on said core. The cladding glass is arranged on said core such that light exiting from the core due to parasitic laser activity can enter the cladding glass and can be absorbed there. The present invention also relates to a method for producing the laser component.

First claim

What is claimed is:

1. A laser component, comprising
a) a crystal comprising doped sapphire, and
b) a cladding glass on said crystal, wherein the cladding glass has an internal transmission of at most 0.8 when measured at a thickness of 1 mm and in a wavelength range of 750 nm to 850 nm,
wherein for radiation in the wavelength range of 750 nm to 850 nm the extraordinary refractive index of the doped sapphire and the refractive index of the cladding glass differ from each other by at most 0.05.

2. The laser component according to claim 1 , wherein the cladding glass with a thickness of 1 mm in a wavelength range of 700 nm to 900 nm has an internal transmission of at most 0.8 and wherein for radiation in the wavelength range of 700 nm to 900 nm the extraordinary refractive index of the doped sapphire and the refractive index of the cladding glass differ from each other by at most 0.05.

3. The laser component according to claim 1 , wherein the sapphire is doped with a dopant which is selected from the group consisting of ions of the elements titanium, chromium, iron, and vanadium.

4. The laser component according to claim 1 , wherein the cladding glass has an internal transmission of at most 0.2, at a thickness of 1 mm in a wavelength range of 750 nm to 850 nm.

5. The laser component according to claim 1 , wherein for radiation in the wavelength range of 750 nm to 850 nm the extraordinary refractive index of the doped sapphire and the refractive index of the cladding glass differ from each other by at most 0.02.

6. The laser component according to claim 1 , wherein a differentiation of the refractive index ((∂n(λ)/∂λ)| λ0 ) at the wavelength λ 0 =800 [nm] is between −3.00×10 −5 and −4.00×10 −5 [nm −1 ].

7. The laser component according to claim 1 , wherein in a temperature range of −30° C. to 70° C. the mean coefficient of linear longitudinal thermal expansion α of the cladding glass differs from the mean value of the mean coefficient of linear longitudinal thermal expansion of the doped sapphire, parallel to the crystallographic axis c of the sapphire, and the mean coefficient of linear longitudinal thermal expansion of the doped sapphire, orthogonal to the crystallographic axis c of the sapphire, by at most 0.5*10 −6 K −1 .

8. The laser component according to claim 1 , wherein the cladding glass comprises the following components (in % by weight):

Component
Proportion (% by weight)

SiO 2
 1 to 15

B 2 O 3
15 to 45

BaO
0 to 5

CaO
 0 to 10

SrO
0 to 2

ZnO
 0 to 30

La 2 O 3
30 to 60

ZrO 2
 0 to 15

Nb 2 O 5
0 to 5

Y 2 O 3
 0 to 15

CuO
 0 to 10

As 2 O 3
0 to 1

Sb 2 O 3
 0 to 1.

9. The laser component according to claim 1 , wherein the cladding glass has a thickness of 0.05 to 100 mm.

10. The laser component according to claim 1 , wherein the cladding glass comprises a coating and wherein the cladding glass is roughened on at least one side area.

11. A method for producing the laser component according to claim 1 , comprising the following steps
a) providing of the doped sapphire,
b) providing of the cladding glass, and
c) arranging of the cladding glass on the doped sapphire.

12. The method of claim 11 , wherein the arranging of the cladding glass on the doped sapphire is performed by optical contact bonding.

13. A glass having a cooling state which corresponds to a steady cooling from a temperature T1 to a temperature T2 with a mean cooling rate in a range of 0.5 K per hour to 40 K per hour, wherein the temperature T1 is at least above the glass transition temperature Tg and the temperature T2 is 20° C., the glass having a refractive index of at least 1.70 and comprising the following components (in % by weight):

Component
Proportion (% by weight)

SiO 2
 1 to 15

B 2 O 3
15 to 45

BaO
0 to 5

CaO
 0 to 10

SrO
0 to 2

ZnO
 0 to 30

La 2 O 3
30 to 60

ZrO 2
 0 to 15

Nb 2 O 5
0 to 5

Y 2 O 3
 0 to 15

CuO
 0 to 10

As 2 O 3
0 to 1

Sb 2 O 3
 0 to 1.

14. A cladding glass of a solid-state laser having a refractive index of at least 1.6, comprising the glass of claim 13 .

15. The laser compone

Assignees

• Schott Ag

Inventors

• Carré Antoine
• Danielou Alain
• Hansen Stefanie
• Apitz Dirk

Classifications

• H01S3/17

  amorphous, e.g. glass · CPC title

• C03C4/0071

  for laserable glass · CPC title

• H01S2301/02

  ASE (amplified spontaneous emission), noise; Reduction thereof · CPC title

• H01S3/1636 Primary

  Al2O3 (Sapphire) · CPC title

• H01S3/0606

  with polygonal cross-section, e.g. slab, prism (H01S3/0604 takes precedence) · CPC title