US3811096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optic modulators
Assignee: AT&T Inc
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Filing: 1972-09-21
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Granted: 1974-05-14
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Expires: 1992-09-21
Abstract
Abstract Magneto-optic modulators of the garnet structure useful over a transparency bandwidth of from about 1 to 5 micrometers show improved figure of merit where the dodecahedral site is at least partially occupied by praseodymium or neodymium, remainder gadolinium or europium.
Inventors
- 👤 S Wemple
- 👤 J Dillon
- 👤 Uitert L Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036; H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/1066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
Apparatus of claim 1 in which the A'' atom consists essentially of praseodymium in the range x 1.5 to 3.0.
Claim 2
Dependent Claim
27 words
Apparatus of claim 2 in which the B'' atom is aluminum in the range y 0.3 to 0.9 or gallium in the range y 0.3 to 0.8.
Claim 3
Dependent Claim
12 words
Apparatus of claim 1 in which z is from 0 to 0.5.
Claim 4
Dependent Claim
17 words
Apparatus of claim 1 in which the first means for introducing radiation includes an optically polished surface.
Claim 5
Dependent Claim
19 words
Apparatus of claim 1 in which the said first means includes a neodymium/YAG laser provided with optical pump means.
Claim 6
Dependent Claim
15 words
Apparatus of claim 6 in which the said optical pump means includes a light-emitting diode.
Claim 7
Dependent Claim
16 words
Apparatus of claim 7 in which the said light-emitting diode is a gallium arsenide junction diode.
Claim 8
Dependent Claim
21 words
Apparatus of claim 8 in which the gallium arsenide diode is modified by aluminum inclusion to change its peak emission wavelength.
Claim 9
Dependent Claim
16 words
Apparatus of claim 8 in which the light-emitting diode is in solid contact with the laser.
References Cited (Backward Citations)
US3459189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |