Patent US4966444A successfully refreshed from Google Patents.
US4966444A
Expired / Lapsed
US
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Feedback-free optical arrangement for converting polarized laser emissions into a convergent beam
Assignee: Siemens AG
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Filing: 1987-12-23
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Granted: 1990-10-30
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Expires: 2007-12-23
Abstract
Abstract An arrangement for converting diverging polarized laser emission from a semiconductor laser into a convergent beam includes two optical lenses and an optical isolator formed of a Faraday rotator and at least one polarizer arranged in the beam path of the laser emission. The lens which lies farther from the semiconductor layer is a component of the Faraday rotator and is formed by a plano-convex lens having an curved side facing the semiconductor laser.
Inventors
- 👤 Karsten Droegemueller
- 👤 Franz Mayerhofer
- 👤 Ekkehard Klement
- 👤 Ulrich Deserno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:42
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G02B19/0052; G02B27/00; G02B27/09; G02B27/0938; G02B27/095; G02B27/0955; G02B6/4207; G02B6/4208; G02F; G02F1/00; G02F1/01; G02F1/09
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
128 words
A feedback-free optical arrangement for converting a divergently emitted polarized laser emission from a semiconductor laser into an at least less divergent beam, comprising: a first optical lens in a beam path of the laser emission from the semiconductor laser; a second optical lens arranged following said first optical lens in a propagation direction of the laser emission from the semiconductor laser, said second optical lens having a curvature on at least one face and having an axis lying parallel to the propagation direction of the semiconductor laser; an optical isolator formed of at least one polarizer in the beam path of the laser emission; a Faraday rotator having said second optical lens as a component part; and said second optical lens being disposed within said Faraday rotator.
Claim 2
Dependent Claim
128 words
A feedback-free optical arrangement for converting a divergently emitted polarized laser emission from a semiconductor laser into an at least less divergent beam, comprising: a first optical lens in a beam path of the laser emission from the semiconductor laser; a second optical lens arranged following said first optical lens in a propagation direction of the laser emission from the semiconductor laser, said second optical lens having a curvature on at least one face and having an axis lying parallel to the propagation direction of the semiconductor laser; an optical isolator formed of at least one polarizer in the beam path of the laser emission; a Faraday rotator having said second optical lens as a component part; and said second optical lens being disposed within said Faraday rotator.
Claim 3
Dependent Claim
27 words
A feedback-free optical arrangement as claimed in claim 1, wherein said second optical lens is a plano-convex lens having an curved side facing toward the semiconductor laser.
Claim 4
Dependent Claim
25 words
A feedback-free optical arrangement as claimed in claim 2, wherein said at least one polarizer is attached to said plano-convex lens at a planar side.
Claim 5
Dependent Claim
21 words
A feedback-free optical arrangement as claimed in claim 3, wherein said at least one polarizer is connected to an optical fiber.
Claim 6
Dependent Claim
29 words
A feedback-free optical arrangement as claimed in claim 1, wherein said at least one polarizer is arranged following said Faraday rotator in the propagation direction of the laser emission.
Claim 7
Dependent Claim
33 words
A feedback-free optical arrangement as claimed in claim 1, wherein said first optical lens is of a material having a refractive index of less than 2 and is formed as a spherical lens.
Claim 8
Dependent Claim
33 words
A feedback-free optical arrangement as claimed in claim 1, wherein said first optical lens is of a material having a refractive index of at least 2 and is formed as a plano-convex lens.
Claim 9
Dependent Claim
23 words
A feedback-free optical arrangement as claimed in claim 7, wherein a planar side of said plano-convex first optical lens faces the semiconductor laser.
Claim 10
Dependent Claim
20 words
A feedback-free optical arrangement as claimed in claim 1, wherein said first and second optical lenses form a telefocussing system.
Claim 11
Dependent Claim
36 words
A feedback-free optical arrangement as claimed in claim 1, wherein said at least one polarizer includes a further polarizer arranged in the beam path of the laser emission between the semiconductor laser and said Faraday rotator.
Claim 12
Dependent Claim
24 words
A feedback-free optical arrangement as claimed in claim 10, wherein said further polarizer is arranged between said first optical lens and said Faraday rotator.
Claim 13
Dependent Claim
31 words
A feedback-free optical arrangement as claimed in claim 10, wherein said further polarizer is an interference polarizer disposed at an oblique angle relative to a propagation direction of the laser radiation.
Claim 14
Dependent Claim
27 words
A feedback-free optical arrangement as claimed in claim 10, further comprising: a housing containing the semiconductor laser; and said further polarizer being a window in said housing.
Claim 15
Dependent Claim
19 words
A feedback-free optical arrangement as claimed in claim 1, wherein said at least one polarizer is an interference polarizer.
Claim 16
Dependent Claim
41 words
A feedback-free optical arrangement as claimed in claim 14, wherein said interference polarizer follows said Faraday rotator in the propagation direction of the laser emission and said interference polarizer is embedded in a block of material transparent to the laser emission.
Claim 17
Dependent Claim
22 words
A feedback-free optical arrangement as claimed in claim 15, wherein said block of transparent material is connected directly to an optical fiber.
Claim 18
Dependent Claim
151 words
A feedback-free optical arrangement for converting diverging polarized laser emissions emitted from a semiconductor laser diode into a converging beam for coupling into an optical fiber, comprising: a first spherical lens in a beam path of the semiconductor laser emission; a Faraday rotator in the beam path of the semiconductor laser emission following said first spherical lens in a propagation direction, said Faraday rotator including a second plano-convex lens having a convex side facing said first spherical lens and a substantially planar side opposite said convex side, said plano-convex lens being of a ferrite and having a thickness sufficient to provide a Faraday rotation of approximately 45 degrees, a ring magnet disposed about said plano-convex lens, and a polarizer in the beam path of the semiconductor laser emission following said second plano-convex lens in the propagation direction so that the laser emission is focussed from said Faraday rotator into optical fiber.
Claim 19
Dependent Claim
151 words
A feedback-free optical arrangement for converting diverging polarized laser emissions emitted from a semiconductor laser diode into a converging beam for coupling into an optical fiber, comprising: a first spherical lens in a beam path of the semiconductor laser emission; a Faraday rotator in the beam path of the semiconductor laser emission following said first spherical lens in a propagation direction, said Faraday rotator including a second plano-convex lens having a convex side facing said first spherical lens and a substantially planar side opposite said convex side, said plano-convex lens being of a ferrite and having a thickness sufficient to provide a Faraday rotation of approximately 45 degrees, a ring magnet disposed about said plano-convex lens, and a polarizer in the beam path of the semiconductor laser emission following said second plano-convex lens in the propagation direction so that the laser emission is focussed from said Faraday rotator into optical fiber.
Claim 20
Dependent Claim
46 words
A feedback-free optical arrangement as claimed in claim 17, wherein said first spherical lens has a focal plane, and the semiconductor laser diode is disposed in said focal plane so that laser emissions that have passed through said first spherical lens are in substantially parallel rays.
Claim 21
Dependent Claim
38 words
A feedback-free optical arrangement as claimed in claim 17, wherein said polarizer includes a multiple layer dielectric element disposed at an angle to said propagation direction, and said polarizer is embedded in a block of substantially transparent material.
Claim 22
Dependent Claim
28 words
A feedback-free optical arrangement as claimed in claim 19, wherein said block of substantially transparent material is affixed to said substantially planar side of said second plano-convex lens.
References Cited (Backward Citations)
JPS5967502A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
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