US3747022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strontium niobate electro-optic modulator
Assignee: NEC Corp
•
Filing: 1971-03-19
•
Granted: 1973-07-17
•
Expires: 1991-03-19
Abstract
Abstract A single domain crystal of strontium niobate exhibits a substantial transverse electro-optic effect. Intensity, frequency and phase modulators for laser beams, or the like either continuous or pulse, utilizing the strontium niobate crystal may be operated over a broad bandwidth including the visible spectrum at low modulation voltage and power.
Inventors
- 👤 S Nanamatsu
- 👤 M Kimura
- 👤 K Doi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0009; G02F1/0018
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
37 words
The modulator as claimed in claim 1, in which said coherent beam is transmitted into said body along the crystallographic b-axis of said body, and said electric field is impressed along the crystallographic c-axis of said body.
Claim 2
Dependent Claim
24 words
The modulator as claimed in claim 2, in which said body has a rectilinear shape elongated along the crystallographic b-axis of said crystalline body.
Claim 3
Dependent Claim
17 words
The modulator as claimed in claim 1, in which said crystalline body has a chemical composition Sr2Nb2O7.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |