Polarizing glass and optical isolator
AssigneeHoya Candeo Optronics Corporation
InventorYoshitaka Yoneda
Life of this patent
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Abstract
The near-field extinction ratio of a polarizing glass is increased. A polarizing glass contains anisotropically shaped metal particles oriented and dispersed in a glass substrate, which contains 0.40-0.85 wt % Cl relative to the entire glass substrate. The Vickers hardness ranges from 360 to 420, the Knoop hardness number ranges from 400 to 495, or the glass substrate contains at least one component selected from the group consisting of Y2O3, La2O3, V2O3, Ta2O3, WO3, and Nb2O5. The content of each of the selected components ranges from 0.05-4 mole percent, and if a plurality of the components are selected, the total content of the components is 6 mole percent or less.
Claims16
A polarizing glass comprising:
- a glass substrate;
- and
- anisotropically shaped metal particles oriented and dispersed in the glass substrate;
- wherein the glass substrate comprises a silicate glass, a borate glass, or a borosilicate glass;
- wherein the glass substrate comprises a first component comprising at least one of Y2O3, La2O3, V2O5, Ta2O5, WO3, and Nb2O5, and a content of each species comprised in the first component ranges from 0.05 to 4 mole percent, or a total content of the first component is 6 mole percent or less if more than one of the species are comprised in the first component;
- wherein a Cl content in the glass substrate ranges from 0.47 to 0.58 wt % based on a total weight of the glass substrate;
- wherein the anisotropically shaped metal particles comprise anisotropically shaped copper particles;
- and
- wherein the glass substrate comprises, in terms of wt % relative to the entire glass substrate:
- SiO2:
- 55-63
- B2O3:
- 16-22,
- Al2O3:
- 7-10,
- alkali metal oxide:
- 8-12,
- alkali earth metal oxide:
- 0-3,
- copper oxide:
- 0.3-1.0,
- SnO:
- 0-0.3,
- As2O3:
- 0-3, and
- F:
- 0.5-1.0.
A polarizing glass comprising:
- a glass substrate;
- and
- anisotropically shaped metal particles oriented and dispersed in the glass substrate;
- wherein the glass substrate comprises a silicate glass, a borate glass, or a borosilicate glass;
- wherein the glass substrate comprises a first component comprising at least one of Y7O3, La7O3, V2O5, Ta2O5, WO3, and Nb2O5, and a content of each species comprised in the first component ranges from 0.05 to 4 mole percent, or a total content of the first component is 6 mole percent or less if more than one of the species are comprised in the first component;
- wherein a Cl content in the glass substrate ranges from 0.47 to 0.58 wt % based on a total weight of the glass substrate;
- and
- wherein a maximum of absolute values of amounts of shift in polarization axis at sites 5 mm away from a center point on a principle surface is 0.137° or less.
A process of producing a polarizing glass comprising anisotropically shaped metal particles oriented and dispersed in a glass substrate by stretching a glass preform, the process comprising:
- melting raw materials of the glass substrate in an airtight melting furnace;
- and
- replacing at least one alkali oxide component in raw materials of the glass substrate with an alkali chloride component,
- wherein the glass substrate comprises a silicate glass, a borate glass, or a borosilicate glass;
- wherein the glass substrate comprises a first component comprising at least one of Y2O3, La2O3, V2O5, Ta2O5, WO3, and Nb2O5, and a content of each species comprised in the first component ranges from 0.05 to 4 mole percent, or a total content of the first component is 6 mole percent or less if more than one of the species are comprised in the first component, and
- wherein a Cl content in the glass substrate ranges from 0.47 to 0.58 wt % based on a total weight of the glass substrate.
Dependencies are inferred from the claim text.