US5075573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-noise optical wave amplification device
Assignee: Thales SA
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Filing: 1990-05-16
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Granted: 1991-12-24
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Expires: 2010-05-16
Abstract
Abstract The invention relates to a low-noise amplification device of an optical wave. Signal wave (F s ) to be amplified interferes with a pump wave (F p ) in such a nonlinear medium (1) as a photorefractive crystal. To reduce the noise considerably, even to eliminate it, the establishing of noise-generating interferences therefore is prevented by moving, by rotation around an axis O, the nonlinear medium.
Inventors
- 👤 Jean-Pierre Huignard
- 👤 Henri Rajbenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:24
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/39; G02F1/397
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A low-noise optical wave amplification device, comprising: a photorefractive medium receiving, at an input face, a signal beam to be amplified and a pump beam, said pump beam and said signal beam interacting to form a zone of interference within said photorefractive medium, and said medium including means for providing as an output, an amplified beam; and means, associated with said photorefractive medium, for adjustably rotating said refractive medium about an axis located outside of said zone of interference of said signal and pump beams so that said input face of said photorefractive medium turns relative to said signal and pump beams.
Claim 2
Dependent Claim
102 words
A low-noise optical wave amplification device, comprising: a photorefractive medium receiving, at an input face, a signal beam to be amplified and a pump beam, said pump beam and said signal beam interacting to form a zone of interference within said photorefractive medium, and said medium including means for providing as an output, an amplified beam; and means, associated with said photorefractive medium, for adjustably rotating said refractive medium about an axis located outside of said zone of interference of said signal and pump beams so that said input face of said photorefractive medium turns relative to said signal and pump beams.
Claim 3
Dependent Claim
30 words
Amplification device according to claim 1, wherein said photorefractive medium (1) is integral with a platform (2) which is rotatable about said axis (20) located outside of photorefractive medium (1).
Claim 4
Dependent Claim
17 words
Amplification device according to claim 2, further comprises a rotation control means (21) associated with platform (2).
Claim 5
Dependent Claim
17 words
Amplification device according to claim 3, wherein said control means (21,22) comprises a mechanical oscillation control device.
Claim 6
Dependent Claim
19 words
Amplification device according to claim 3, wherein said control means (21) comprises a device with a piezoelectric ceramic base.
Claim 7
Dependent Claim
15 words
Amplification device according to claim 3, wherein said control means (21) comprises a bimetallic strip.
Claim 8
Dependent Claim
22 words
Amplification device according to claim 3, wherein said rotation control means (21) comprises a means for causing oscillation movement of platform (2).
Claim 9
Dependent Claim
86 words
A low-noise optical wave amplification process comprising the steps of: providing, to a refractive medium, a signal beam to be amplified and a pump beam; outputting, from said photorefractive medium, an amplified beam as the result of interference of said signal beam and said pump beam; and imparting, by way of a rotation means associated with said photorefractive medium, rotational movement to said photorefractive medium wherein said rotational movement is about an axis located outside of a zone of interference of said signal and pump beams.
Claim 10
Dependent Claim
86 words
A low-noise optical wave amplification process comprising the steps of: providing, to a refractive medium, a signal beam to be amplified and a pump beam; outputting, from said photorefractive medium, an amplified beam as the result of interference of said signal beam and said pump beam; and imparting, by way of a rotation means associated with said photorefractive medium, rotational movement to said photorefractive medium wherein said rotational movement is about an axis located outside of a zone of interference of said signal and pump beams.
Claim 11
Dependent Claim
18 words
Optical wave amplification process according to claim 8, wherein the oscillation movement is an oscillation of low amplitude.
Claim 12
Dependent Claim
18 words
Optical wave amplification process according to claim 8, wherein the oscillation movement is an oscillation of great amplitude.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |