US4755026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetooptic garnet
Assignee: NEC Corp
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Filing: 1986-06-26
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Granted: 1988-07-05
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Expires: 2006-06-26
Abstract
Abstract A magnetooptic garnet single crystal film for use in a Faraday rotator is Dy 3-x Bi x Fe 5 O 12 (x=0.2-1). The garnet has a reduced temperature characteristic of the Faraday rotation angle, to thereby insure a reliable and stabilized isolation against temperature variation.
Inventors
- 👤 Yoichi Honda
- 👤 Taketoshi Hibiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:12
CPC Classifications
C; C30; C30B; C30B19/00; C30B19/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A magnetooptic single crystal garnet characterized by a composition represented by a formula Dy 3-x Bi x Fe 5 O 12 , where x=0.2-0.7, said crystal having a reduced temperature characteristic of the Faraday rotation coefficient.
Claim 2
Dependent Claim
36 words
A magnetooptic single crystal garnet characterized by a composition represented by a formula Dy 3-x Bi x Fe 5 O 12 , where x=0.2-0.7, said crystal having a reduced temperature characteristic of the Faraday rotation coefficient.
Claim 3
Dependent Claim
12 words
A magnetooptic single crystal garnet as claimed in claim 1, wherein x=0.2-0.7.
Claim 4
Dependent Claim
12 words
A magnetooptic single crystal garnet as claimed in claim 2, wherein x=0.25-0.6.
Claim 5
Dependent Claim
56 words
An optical Faraday rotator comprising a non-magnetic garnet substrate and a magnetooptic single crystal garnet film formed on said substrate by the liquid-phase epitaxial technique, wherein said film is made of said magnetooptic single crystal garnet as claimed in claim 1, said optical Faraday rotator having a Faraday rotation angle which is stabilized against temperature variations.
References Cited (Backward Citations)
US4544438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |