US4712855A
Expired / Lapsed
US
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Planar optical waveguide and method of manufacturing same
Assignee: US Philips Corp
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Filing: 1986-01-13
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Granted: 1987-12-15
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Expires: 2006-01-13
Abstract
Abstract Planar optical waveguide having a crystal body consisting of a nonmagnetic substrate having a first magnetooptical layer epitaxially provided on the substrate and a second magnetooptical layer epitaxially provided on the first mangetooptical layer. The two magnetooptical layers consist of a material based on iron garnet. The second magnetooptical layer has a refractice index n 2 which is approximately 1×10 -3 to 1×10 -2 higher than the refractive index n 1 of the first magnetooptical layer. A layer of a material based on iron garnet and absorbing radiation in the wavelength range of 1.0≦λ≦2.5 μm is provided between the substrate and the first magnetooptical layer, said iron garnet-based layer having a refractive index n A which is higher than the refractive index of the first magnetooptical layer.
Inventors
- 👤 Wolfgang F. M. Tolksdorf
- 👤 Inske E. H. Bartels
- 👤 Hans O. B. Dammann
- 👤 Claus-Peter Klages
- 👤 Elke B. Pross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:25
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G02F1/095; B; B82; B82Y; B82Y25/00; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; H01F10/245; H01F10/32; H01F10/3209
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
133 words
A planar optical waveguide having a crystal body consisting of a nonmagnetic substrate having a first magnetooptical layer epitaxially provided on the substrate and a second magnetooptical layer epitaxially provided on the first magnetooptical layer, the two magnetooptical layers consisting of a material based on iron garnet, the second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 higher than the refractive index n 1 of the first magnetooptical layer; characterized in that a layer (5) of a material based on iron garnet and absorbing radiation in the wavelength of 1.0≦λ≦2.5 μm is provided between the substrate (3) and the first magnetooptical layer (7), said iron garnet-based layer having a refractive index n A which is higher than the refractive index of the first magnetooptical layer.
Claim 2
Dependent Claim
133 words
A planar optical waveguide having a crystal body consisting of a nonmagnetic substrate having a first magnetooptical layer epitaxially provided on the substrate and a second magnetooptical layer epitaxially provided on the first magnetooptical layer, the two magnetooptical layers consisting of a material based on iron garnet, the second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 higher than the refractive index n 1 of the first magnetooptical layer; characterized in that a layer (5) of a material based on iron garnet and absorbing radiation in the wavelength of 1.0≦λ≦2.5 μm is provided between the substrate (3) and the first magnetooptical layer (7), said iron garnet-based layer having a refractive index n A which is higher than the refractive index of the first magnetooptical layer.
Claim 3
Dependent Claim
66 words
A planar optical waveguide as claimed in claim 1, characterized in that the material for the magnetooptical layers has as composition defined by the general formula Y 3-x Pb x Fe 5 O 12 where x=0.007 to 0.025 for the first magnetooptical layer (7) adjoining the absorption layer (5) and where x=0.02 to 0.04 for the second magnetooptical layer (9) provided on the first magnetooptical layer.
Claim 4
Dependent Claim
45 words
A planar optical waveguide as claimed in claim 2, characterized in that in the material of the absorption layer (5) at least a substituent in the form of a cation which can occupy dodecahedral, octahedral or tetrahedral lattice sites is present in the garnet lattice.
Claim 5
Dependent Claim
72 words
A planar optical waveguide as claimed in claim 3, characterized in that the absorption layer (5) has a composition defined by the general formula Y 3 Fe 5-x-y-z A x D y M z O 12 in which A=Co III , D=Co III , M=Si IV , Ge IV , Ti IV , Zr IV or mixtures of these ions where 0≦x≦0.3 0≦y≦0.3 z≧y 0≦y+z≦0.6 x+y+z≦0.6 x+y>0 and where z=0 when y=0.
Claim 6
Dependent Claim
34 words
A planar optical waveguide as claimed in claim 4, characterized in that the absorption layer (5) has a composition defined by the formula Y 3 Fe 4 .9 Co 0 .1 O 12 .
Claim 7
Dependent Claim
37 words
A planar optical waveguide as claimed in claim 4, characterized in that the absorption layer (5) has a composition defined by the formula Y 3 Fe 4 .939 Co 0 .018 Ge 0 .042 O 12 .
Claim 8
Dependent Claim
37 words
A planar optical waveguide as claimed in claim 4, characterized in that the absorption layer (5) has a composition defined by the formula Y 3 Fe 4 .73 Co 0 .12 Si 0 .15 O 12 .
Claim 9
Dependent Claim
22 words
A planar optical waveguide as claimed in claim 4 characterized in that the absorption layer (5) has a thickness of ≦100 μm.
Claim 10
Dependent Claim
29 words
A planar optical waveguide as claimed in claim 4, characterized in that the substrate (3) has a composition defined by the formula Gd 3 Ga 5 O 12 .
Claim 11
Dependent Claim
126 words
A planar optical waveguide comprising: a nonmagnetic substrate; an absorption layer epitaxially provided on the substrate, said absorption layer being an iron garnet, said absorption layer absorbing radiation in the wavelength range from 1.0 to 2.5 microns, said absorption layer having a refractive index n A ; a first magnetooptical layer epitaxially provided on the absorption layer, said first magnetooptical layer being an iron garnet, said first magnetooptical layer having a refractive index n 1 which is less than n A ; and a second magnetooptical layer epitaxially provided on the first magnetooptical layer, said second magnetooptical layer being an iron garnet, said second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 times greater than n 1 .
Claim 12
Dependent Claim
126 words
A planar optical waveguide comprising: a nonmagnetic substrate; an absorption layer epitaxially provided on the substrate, said absorption layer being an iron garnet, said absorption layer absorbing radiation in the wavelength range from 1.0 to 2.5 microns, said absorption layer having a refractive index n A ; a first magnetooptical layer epitaxially provided on the absorption layer, said first magnetooptical layer being an iron garnet, said first magnetooptical layer having a refractive index n 1 which is less than n A ; and a second magnetooptical layer epitaxially provided on the first magnetooptical layer, said second magnetooptical layer being an iron garnet, said second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 times greater than n 1 .
Claim 13
Dependent Claim
19 words
A planar optical waveguide as claimed in claim 10, characterized in that the waveguide is a single mode waveguide.
Claim 14
Dependent Claim
127 words
A planar one-way optical waveguide comprising: a nonmagnetic substrate; an absorption layer epitaxially provided on the substrate, said absorption layer being an iron garnet, said absorption layer absorbing radation in the wavelength range from 1.0 to 2.5 microns, said absorption layer having a refractive index n A ; a first magnetooptical layer epitaxially provided on the absorption layer, said first magnetooptical layer being an iron garnet, said first magnetooptical layer having a refractive index n 1 which is less than n A ; and a second magnetooptical layer epitaxially provided on the first magnetooptical layer, said second magnetooptical layer being an iron garnet, said second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 times greater than n 1 .
Claim 15
Dependent Claim
127 words
A planar one-way optical waveguide comprising: a nonmagnetic substrate; an absorption layer epitaxially provided on the substrate, said absorption layer being an iron garnet, said absorption layer absorbing radation in the wavelength range from 1.0 to 2.5 microns, said absorption layer having a refractive index n A ; a first magnetooptical layer epitaxially provided on the absorption layer, said first magnetooptical layer being an iron garnet, said first magnetooptical layer having a refractive index n 1 which is less than n A ; and a second magnetooptical layer epitaxially provided on the first magnetooptical layer, said second magnetooptical layer being an iron garnet, said second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 times greater than n 1 .
Claim 16
Dependent Claim
19 words
A planar optical waveguide as claimed in claim 12, characterized in that the waveguide is a single mode waveguide.
Claim 17
Independent Claim
136 words
A method of manufacturing a planar optical waveguide, said method comprising the steps of: providing a nonmagnetic substrate; epitaxially depositing an absorption layer on the substrate, said absorption layer being an iron garnet, said absorption layer absorbing radiation in the wavelength range from 1.0 to 2.5 microns, said absorption layer having a refractive index n A ; epitaxially depositing a first magnetooptical layer on the absorption layer, said first magnetooptical layer being an iron garnet, said first magnetooptical layer having a refractive index n 1 which is less than n A ; and epitaxially depositing a second magnetooptical layer on the first magnetooptical layer, said second magnetooptical layer being an iron garnet, said second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 times greater than n 1 .
Claim 18
Independent Claim
136 words
A method of manufacturing a planar optical waveguide, said method comprising the steps of: providing a nonmagnetic substrate; epitaxially depositing an absorption layer on the substrate, said absorption layer being an iron garnet, said absorption layer absorbing radiation in the wavelength range from 1.0 to 2.5 microns, said absorption layer having a refractive index n A ; epitaxially depositing a first magnetooptical layer on the absorption layer, said first magnetooptical layer being an iron garnet, said first magnetooptical layer having a refractive index n 1 which is less than n A ; and epitaxially depositing a second magnetooptical layer on the first magnetooptical layer, said second magnetooptical layer being an iron garnet, said second magnetooptical layer having a refractive index n 2 which is approximately 1×10 -3 to 1×10 -2 times greater than n 1 .
Claim 19
Dependent Claim
74 words
A method as claimed in claim 14, characterized in that an absorption layer having a composition defined by the general formula Y 3 Fe 5-x-y-z A x D y M z O 12 is deposited on the substrate, in which A=Co III , D=Co II , M=Si IV , Ge IV , Ti IV , Zr IV or mixtures of these ions, where 0≦x≦0.3 0≦y≦0.3 z≧y 0≦y+z≦0.6 x+y+z≦0.6 x+y>0 and where z=0 when y=0.
Claim 20
Dependent Claim
32 words
A method as claimed in claim 11, characterized in that an absorption layer defined by the formula Y 3 Fe 4 .9 Co 0 .1 O 12 is deposited on the substrate.
Claim 21
Dependent Claim
35 words
A method as claimed in claim 11, characterized in that an absorption layer defined by the formula Y 3 Fe 4 .939 Co 0 .018 Ge 0 .042 O 12 is deposited on the substrate.
Claim 22
Dependent Claim
35 words
A method as claimed in claim 11, characterized in that an absorption layer defined by the formula Y 3 Fe 4 .73 Co 0 .12 Si 0 .15 O 12 is deposited on the substrate.
Claim 23
Dependent Claim
23 words
A method as claimed in claim 11, characterized in that a substrate of the composition Gd 3 Ga 5 O 12 is used.
Claim 24
Dependent Claim
17 words
A method as claimed in claim 12, characterized in that the waveguide is a single mode waveguide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |