Patent US5046801A successfully refreshed from Google Patents.
US5046801A
Expired / Lapsed
US
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Optical waveguide having low optical damage
Assignee: Sumitomo Metal Mining Co Ltd
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Filing: 1990-09-24
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Granted: 1991-09-10
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Expires: 2010-09-24
Abstract
Abstract An optical waveguide produced from a lithium niobate single crystal substrate diffused thereon titanium is claimed, wherein, as the substrate is used a single crystal of lithium niobate having an optical absorbance coefficient of 0.03 cm -1 or less for a light 420 nm in wavelength. The optical waveguide according to the present invention shows improved resistance against optical damage as compared with prior art waveguides, and is therefore suitable for devices subjected to incidence beam of higher intensity.
Inventors
- 👤 Akira Terashima
- 👤 Takumi Fujiwara
- 👤 Hiroshi Mork
- 👤 Takeshi Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:14
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/13; G02B6/134; G02B6/1342
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
42 words
An optical waveguide produced from a lithium niobate single crystal substrate diffused thereon titanium, wherein, the substrate is a single crystal of lithium niobate having an optical absorption coefficient of 0.03 cm -1 or less for a light 420 nm in wavelength.
Claim 2
Dependent Claim
42 words
An optical waveguide produced from a lithium niobate single crystal substrate diffused thereon titanium, wherein, the substrate is a single crystal of lithium niobate having an optical absorption coefficient of 0.03 cm -1 or less for a light 420 nm in wavelength.
Claim 3
Dependent Claim
42 words
The optical waveguide as claimed in claim 1, wherein the lithium niobate single crystal is such grown by Czochralski method from 99.9995% pure LiNbO 3 under an atmosphere the oxygen concentration of which is controlled to from 0.1 to 10% by volume.
References Cited (Backward Citations)
US3957342A
Cited
US4783136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |