US3828264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for optical amplification of a coherent signal
Assignee: Eltro GmbH and Co
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Filing: 1972-12-29
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Granted: 1974-08-06
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Expires: 1992-12-29
Abstract
Abstract A device for optical amplification of a coherent signal comprising a laser composed of a bundle of fibres which are individually pumped simultaneously. The fibres are constituted as gradient fibres. An objective is located behind the bundle and a frequency filter is secured to the bundle and mounted at the Fourier plane of the objective. An auto-collimator may be provided for the amplified coherent light beams.
Inventors
- 👤 W Friedl
- 👤 C Aberle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:00
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/23; H01S3/2308; H01S3/2325; H01S3/2333; H01S3/05; H01S3/06; H01S3/07; H01S3/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A device for optical amplification of a coherent signal comprising a laser structure including a fibre bunch having input and output surfaces which are curved, the individual fibres of the bunch being pumped simultaneously, said fibres of the fibre bunch being composed as a plurality of unarranged gradient fibres serving for signal amplification and image amplification, an objective located behind the fibre bunch, a frequency filter secured to said bunch and mounted at the Fourier plane of said objective, and means for auto-collimation of the amplified coherent light beams and for separating the output light beam.
Claim 2
Independent Claim
96 words
A device for optical amplification of a coherent signal comprising a laser structure including a fibre bunch having input and output surfaces which are curved, the individual fibres of the bunch being pumped simultaneously, said fibres of the fibre bunch being composed as a plurality of unarranged gradient fibres serving for signal amplification and image amplification, an objective located behind the fibre bunch, a frequency filter secured to said bunch and mounted at the Fourier plane of said objective, and means for auto-collimation of the amplified coherent light beams and for separating the output light beam.
Claim 3
Dependent Claim
49 words
A device according to claim 1 comprising two fields lens systems, one arranged to face the input of said bunch, the other one to face the output of said bunch such that one of the field lens systems is focussed on the auto-collimation means by means of said objective.
Claim 4
Dependent Claim
36 words
A device according to claim 1 comprising transparent phase grating means arranged between the objective and the fibre bunch for increasing the light beam intensity at the inputs of the individual fibres by attenuating incohErent waves.
Claim 5
Dependent Claim
28 words
A device according to claim 3 wherein said grating means has a phase structure with recesses or grooves which are small in comparison to the phase grating constants.
Claim 6
Dependent Claim
31 words
A device according to claim 1 wherein the auto-collimation means comprises a mirror which is semi-transparent, and an objective for collimation of the separated light beams located behind the semi-transparent mirror.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |