Cladding glass for solid-state lasers
AssigneeSchott AG
InventorsAntoine Carré, Alain Danielou, Stefanie Hansen, Dirk Apitz
Life of this patent
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Abstract
The present disclosure 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 disclosure 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. Thus, a laser component with improved efficiency is obtained. The present disclosure also relates to a method for producing the laser component.
Claims17
A glass having a refractive index of at least 1.70, the glass comprising the following components (in % by weight):
- Component
- Proportion (% by weight)
- SiO2
- 20 to 50
- B2O3
- 0 to 5
- BaO
- 1 to 15
- CaO
- 0 to 10
- SrO
- 0 to 2
- ZnO
- 0 to 5
- Na2O
- 2 to 20
- K2O
- 1 to 15
- TiO2
- 10 to 50
- La2O3
- 0 to 5
- ZrO2
- 0 to 5
- Nb2O5
- 1 to 20
- Y2O3
- 0 to 5
- absorption component
- 0.1 to 10
- As2O3
- 0 to 1
- Sb2O3
- 0 to 1,
- wherein the absorption component is selected from the group consisting of:
- CuO, NiO, CoO, Fe2O3, V2O5, CrO, MnO, SeO2, and mixtures of two or more thereof, and wherein the glass has a linear thermal expansion of the glass <αglass> in a range of 4.5*10−6 K−1 to 7.0*10−6 K−1 in a temperature range of −30° C. to 70° C.
A glass comprising a refractive index of at least 1.74 and the following components (in % by weight);
- Component
- Proportion (% by weight)
- SiO2
- >15 to 45
- Al2O3
- 0.1 to 10
- PbO
- 45 to 75
- B2O3
- 0 to 5
- BaO
- 0 to 5
- CaO
- 0 to 5
- SrO
- 0 to 2
- ZnO
- 0 to 5
- Na2O
- 0 to 10
- K2O
- 0 to 5
- TiO2
- 0 to 20
- La2O3
- 0 to 5
- ZrO2
- 0 to 5
- Nb2O5
- 0 to 5
- Y2O3
- 0 to 5
- absorption component
- 0.1 to 10
- As2O3
- 0 to 1
- Sb2O3
- 0 to 1,
- wherein the absorption component is selected from the group consisting of:
- CuO, NiO, CoO, Fe2O3, V2O5, CrO, MnO, SeO2, and mixtures of two or more thereof, and
- wherein the equation
- c
- ×
- ɛ
- λ
- ×
- l
- >
- -
- 1
- 2
-
- ln
-
- (
- 1
- -
- R
- G
-
- l
-
- a
-
- s
-
- s
- /
- E
-
- n
-
- ν
- )
- is fulfilled, wherein c is the proportion of the absorption component in the glass in mol %, ελ is the molar extinction coefficient of the absorption component for light of the wavelength λ in (mm*mol %)−1, l is the glass thickness in mm, RGlass/Env is the Fresnel coefficient given by the relation
- R
- G
-
- l
-
- a
-
- s
-
- s
- /
- E
-
- n
-
- v
- =
- (
- n
- λ
- E
-
- n
-
- ν
- -
- n
- λ
- G
-
- l
-
- a
-
- s
-
- s
- )
- 2
- (
- n
- λ
- E
-
- n
-
- ν
- +
- n
- λ
- G
-
- l
-
- a
-
- s
-
- s
- )
- 2
- with nλGlass being the refractive index of the glass for light of the wavelength λ and nλEnv being the refractive index of an environment for light of the wavelength λ, and A is the fraction of light of the wavelength λ absorbed by the glass, wherein A is at least 0.95.
A cladding glass of a solid state laser, comprising a glass having a refractive index of at least 1.74 and the following components (in % by weight):
- Component
- Proportion (% by weight)
- SiO2
- >15 to 45
- Al2O3
- 0.1 to 10
- PbO
- 45 to 75
- B2O3
- 0 to 5
- BaO
- 0 to 5
- CaO
- 0 to 5
- SrO
- 0 to 2
- ZnO
- 0 to 5
- Na2O
- 0 to 10
- K2O
- 0 to 5
- TiO2
- 0 to 20
- La2O3
- 0 to 5
- ZrO2
- 0 to 5
- Nb2O5
- 0 to 5
- Y2O3
- 0 to 5
- absorption component
- 0.1 to 10
- As2O3
- 0 to 1
- Sb2O3
- 0 to 1,
- wherein the absorption component is selected from the group consisting of:
- CuO, NiO, CoO, Fe2O3, V2O5, CrO, MnO, SeO2, and mixtures of two or more thereof.
A glass comprising a refractive index of at least 1.74 and the following components (in % by weight):
- Component
- Proportion (% by weight)
- SiO2
- >15 to 45
- Al2O3
- 0.1 to 10
- PbO
- 45 to 75
- B2O3
- 0 to 5
- BaO
- 0 to 5
- CaO
- 0 to 5
- SrO
- 0 to 2
- ZnO
- 0 to 5
- Na2O
- 0 to 10
- K2O
- 0 to 5
- TiO2
- 0 to 20
- La2O3
- 0 to 5
- ZrO2
- 0 to 5
- Nb2O5
- 0 to 5
- Y2O3
- 0 to 5
- absorption component
- 0.1 to 10
- As2O3
- 0 to 1
- Sb2O3
- 0 to 1,
- wherein the absorption component is selected from the group consisting of:
- CuO, NiO, CoO, Fe2O3, V2O5, CrO, MnO, SeO2, and mixtures of two or more thereof, and
- wherein the glass has the linear thermal expansion of the glass <αglass> in a range of 4.5*10−6 K−1 to 7.0*10−6 K−1 in a temperature range of −30° C. to 70° C.
Dependencies are inferred from the claim text.