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US4451151A
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Optical device for sustaining a radiant energy pulse which circulates within a monomode wave guide a gyrometer and a hydrophone equipped with said optical device
Assignee: Thales SA
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Filing: 1982-02-23
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Granted: 1984-05-29
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Expires: 2002-02-23
Abstract
Abstract An interaction medium in which a photoinduced phase grating has been permanently recorded beforehand is coupled to the two ends of a monomode waveguide. A first wave which is a pulse travels through said waveguide and interferes with a second pumping wave in order to permit energy transfer from the second pumping wave to the first wave.
Inventors
- 👤 Jean-Pierre Huignard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:59
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01H; G01H9/00; G01H9/004; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G02F1/0541
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
150 words
An optical device for sustaining a radiant energy pulse which circulates within a monomode waveguide, said device being constituted by a monomode optical waveguide in which is circulated a first wave consisting of a radiant energy pulse produced by a coherent source, optical connecting means being optically coupled to the end faces of said waveguide in order to form a circulation loop, wherein said optical connecting means consist of an interaction medium in which a phase grating has been photoinduced by the interference of two beams produced by said coherent source, said medium being coupled to the two end faces of said waveguide through the intermediary of optical focusing means, the energy of a pumping wave being transferred to said first wave via said medium and said pumping wave being derived from said coherent source, said energy being sufficient to sustain the radiant energy pulse which circulates within said loop.
Claim 2
Dependent Claim
150 words
An optical device for sustaining a radiant energy pulse which circulates within a monomode waveguide, said device being constituted by a monomode optical waveguide in which is circulated a first wave consisting of a radiant energy pulse produced by a coherent source, optical connecting means being optically coupled to the end faces of said waveguide in order to form a circulation loop, wherein said optical connecting means consist of an interaction medium in which a phase grating has been photoinduced by the interference of two beams produced by said coherent source, said medium being coupled to the two end faces of said waveguide through the intermediary of optical focusing means, the energy of a pumping wave being transferred to said first wave via said medium and said pumping wave being derived from said coherent source, said energy being sufficient to sustain the radiant energy pulse which circulates within said loop.
Claim 3
Dependent Claim
16 words
An optical device according to claim 1, wherein said monomode waveguide is a monomode optical fiber.
Claim 4
Dependent Claim
16 words
An optical device according to claim 1, wherein the material constituting said interaction medium is gelatin.
Claim 5
Dependent Claim
15 words
An optical device according to claim 1, wherein the optical focusing means are converging lenses.
Claim 6
Dependent Claim
21 words
An optical device according to claim 1, wherein a splitter plate is interposed on the path of the radiant energy pulse.
Claim 7
Dependent Claim
53 words
An optical device according to claim 1, wherein a beam separator is placed at the exit of said coherent source and one of the beam components makes it possible after passing through an amplitude modulator and a beamwidener to insert said radiant energy pulse into the loop by means of a splitter plate.
Claim 8
Dependent Claim
21 words
A device according to claim 1, wherein the pumping wave is produced by a laser and passes through a phase modulator.
Claim 9
Dependent Claim
30 words
A device according to claim 7, wherein said phase modulator serves to adjust the relative phase shift between the pumping wave and the first wave which impinges on the medium.
Claim 10
Dependent Claim
14 words
A device according to claim 8, wherein said phase shift is adjusted to π/2.
Claim 11
Dependent Claim
20 words
A device according to claim 1, wherein a detector receives a pumping wave which is not diffracted by the medium.
Claim 12
Dependent Claim
10 words
A gyrometer comprising an optical device according to claim 1.
Claim 13
Dependent Claim
10 words
A hydrophone comprising an optical device according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |