US3900246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lanthanum titanate single crystal electro-optic modulator
Assignee: NEC Corp
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Filing: 1974-02-25
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Granted: 1975-08-19
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Expires: 1994-02-25
Abstract
Abstract An optical modulator is disclosed in which a lanthanum titanate single crystal is employed as the electro-optic material. Intensity, frequency, or phase modulation of either continuous or pulsed laser beams may be achieved by the modulator which may be operated over a broad bandwidth including the visible spectrum at low modulation voltage and power.
Inventors
- 👤 Masakazu Kimura
- 👤 Satoshi Nanamatsu
- 👤 Kikuo Doi
- 👤 Shigeo Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:12
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0018
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
150 words
AN INTENSTY MODULATOR FOR A LIGHT BEAM COMPRISING: A. A CRYSTOL ELEMENT HAVING A RECTANGULAR PARALLELIPED SHAPE ELONGATED IN THE DIRECTION PARALLEL TO THE NATURAL CLEAVAGE PLANE AND NORMAL TO BOTH OF THE OPTIC AXES OF SAID CRYSTAL ELEMENT, SAID CRYSTAL ELEMENT COMPRISING A SINGLE CRYSTAL HAVING A NORMINAL COMPOSITION OF LA2 TI2 07, B. FIRST AND SECOND LIGHT POLARIZERS HAVING POLARIZATION DIRECTION AT RIGHT ANGLES, C. MEANS FOR IMPROVING AN ELECTRIC FIELD ACROSS SAID CRYSTAL ELEMENT IN A DIRECTION PARALLEL TO SAID NATURAL CLEAVAGE PLANE AND PARALLEL TO A PLANE CONTAINING BOTH OF SAID OPTIC AXES OF SAID CRYSTAL ELEMENT, WHEREIN ALIGHT BEAM IS TRANSIMITTED THROUGH SAID FIRST POLARIZER, SAID CRYSTAL ELEMENT AND SAID SECOND POLARIZER IN SUCCESSION IN SAID DIRECTTION PARALLEL TO SAID NATRAL CLEAVAGE PLANE AND NORMAL TO BOTH OF SAID OPTIC AXES OF SAID CRYSTAL ELEMENT, AND THE INTENSITY LIGHT BEAM IS MODIFIED BY THE LINEAR
Claim 2
Dependent Claim
150 words
AN INTENSTY MODULATOR FOR A LIGHT BEAM COMPRISING: A. A CRYSTOL ELEMENT HAVING A RECTANGULAR PARALLELIPED SHAPE ELONGATED IN THE DIRECTION PARALLEL TO THE NATURAL CLEAVAGE PLANE AND NORMAL TO BOTH OF THE OPTIC AXES OF SAID CRYSTAL ELEMENT, SAID CRYSTAL ELEMENT COMPRISING A SINGLE CRYSTAL HAVING A NORMINAL COMPOSITION OF LA2 TI2 07, B. FIRST AND SECOND LIGHT POLARIZERS HAVING POLARIZATION DIRECTION AT RIGHT ANGLES, C. MEANS FOR IMPROVING AN ELECTRIC FIELD ACROSS SAID CRYSTAL ELEMENT IN A DIRECTION PARALLEL TO SAID NATURAL CLEAVAGE PLANE AND PARALLEL TO A PLANE CONTAINING BOTH OF SAID OPTIC AXES OF SAID CRYSTAL ELEMENT, WHEREIN ALIGHT BEAM IS TRANSIMITTED THROUGH SAID FIRST POLARIZER, SAID CRYSTAL ELEMENT AND SAID SECOND POLARIZER IN SUCCESSION IN SAID DIRECTTION PARALLEL TO SAID NATRAL CLEAVAGE PLANE AND NORMAL TO BOTH OF SAID OPTIC AXES OF SAID CRYSTAL ELEMENT, AND THE INTENSITY LIGHT BEAM IS MODIFIED BY THE LINEAR
Claim 3
Dependent Claim
25 words
The modulator as claimed in claim 1, in which the molecular ratio of La2O3 to TiO2 in said crystal element varies from 0.9:2 to 1.1:2.
References Cited (Backward Citations)
US3747022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |