WO2010115393A1 - Ensemble de plusieurs aimants pour rotateur de faraday - Google Patents

Ensemble de plusieurs aimants pour rotateur de faraday Download PDF

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Publication number
WO2010115393A1
WO2010115393A1 PCT/DE2010/000285 DE2010000285W WO2010115393A1 WO 2010115393 A1 WO2010115393 A1 WO 2010115393A1 DE 2010000285 W DE2010000285 W DE 2010000285W WO 2010115393 A1 WO2010115393 A1 WO 2010115393A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
faraday
magnets
optical
magnet
Prior art date
Application number
PCT/DE2010/000285
Other languages
German (de)
English (en)
Inventor
Kolja Nicklaus
Original Assignee
Jt Optical Engine Gmbh + Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jt Optical Engine Gmbh + Co. Kg filed Critical Jt Optical Engine Gmbh + Co. Kg
Publication of WO2010115393A1 publication Critical patent/WO2010115393A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
    • G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/16—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 series; tandem
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/17—Multi-pass arrangements, i.e. arrangements to pass light a plurality of times through the same element, e.g. by using an enhancement cavity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/18—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/021—Construction of PM

Definitions

  • the present invention relates to a Faraday rotator for high power optical radiation.
  • a Faraday rotator consists of a polarization rotator based on the Faraday effect.
  • Faraday rotators are often used in conjunction with a polarizer assembly to form an optical isolator. Therefore, in the prior art, the Faraday rotators are typically described in the context of optical isolator arrangements.
  • Such optical isolators are known, for example, in the field of optical telecommunications for both polarized and unpolarized radiation. These insulators are used up to a power of about 1 W and use to rotate the polarization of the optical electromagnetic field ferromagnetic Faraday-active media (so-called Faraday media) with very large Verdetkonstante such as YIG or BIG crystals. Due to the large Verdetkonstante are comparatively small magnetic fields, which can be generated for example by a simple small permanent magnet.
  • the known ferromagnetic Faraday media are not suitable because of their low optical quality and high absorption.
  • paramagnetic crystals and glasses are used, such as Tb: glass or TGG crystals, which have one to two orders of magnitude lower dilution constant.
  • Tb glass or TGG crystals
  • Tcm 22.7 7
  • the required crystal length for a polarization rotation of 45 °, as required in Faraday isolators, at a magnetic field strength of 1 T is about 20 mm.
  • EP 1660 931 B1 describes a rotationally symmetrical arrangement which enables a strong homogeneous magnetic field in the free aperture for a single cylindrical Faraday medium. In the case of two Faraday media or a medium with a high aspect ratio, however, a very large circular free aperture is needed, whereby the arrangement occupies a large space.
  • US Pat. No. 5,528,415 describes an arrangement of prism-shaped magnets with a trapezoid as the base surface with rectangular external dimensions, which has a square aperture and in which a homogeneous field is also achieved in the area of the enclosed inner circle.
  • a very large square free aperture is needed, whereby the arrangement again occupies a large installation space. If the arrangement is only scaled in one direction, the magnetic field in the aperture becomes inhomogeneous, which impairs the rotation of the polarization or optical isolation.
  • the object is achieved by an arrangement of a Faraday rotator consisting of one or more Faradaymedien and a magnet assembly which allows the recording of several Faradaymedien, characterized in that the arrangement of the magnetic field is formed from such shaped magnets that at least the outer Magnets are cuboid.
  • An advantage of such a magnet arrangement with at least the external magnets in cuboid shape is that a scaling of the free aperture of the arrangement along one direction while maintaining the homogeneity of the integrated over the length magnetic field of 5% (+2.5%) is possible.
  • the aspect ratio (length / width / depth) of the magnet assembly is to be optimized depending on the free aperture and required length of the Faraday medium so that a homogeneous, integrated over the length of the magnetic field in the free aperture, the deviation of the homogeneity no longer than 5%.
  • the magnet arrangement preferably generates within the aperture a magnetic field of 0.7 T.
  • the aperture of the magnet arrangement corresponds at least to the diameter of the Faraday medium and is preferably smaller than 2 times this diameter.
  • the aperture can also be a multiple of the diameter of the Faraday medium or a multiple of the maximum 2 times the diameter of the Faraday medium, so that several Faradaymedien can be arranged side by side within the aperture.
  • the cuboid magnets of the magnet assembly may be chamfered in an exemplary embodiment at the outer corners of the assembly.
  • the edge length of the magnet arrangement can be reduced by up to a quarter of this edge length, for example. This will be the
  • Attach fasteners such as screws or dowel pins to the recessed corners.
  • the edge length reduction may be uniform at all four corners, but may vary.
  • spacers can be introduced, which prevent individual magnets can reduce the free aperture.
  • spacers are advantageous because the individual magnets of the arrangement can exert large forces on each other by their magnetization.
  • the spacers may be part of the outer housing, part of the holder of the Faraday medium or the Faraday media, separate components or fused with the magnets.
  • the Faraday rotator can also be passed several times by folding with the aid of folding elements.
  • Tb glass or TGG crystals can be used as Faraday media.
  • the shape of the Faraday media is typically rod-shaped, but may also have a high aspect ratio (so-called "slab") or be formed as a prism body.
  • FIG. 1a is a schematic view of an annular magnet arrangement (prior art);
  • FIG. 1 b scaling of an annular magnet arrangement (prior art);
  • Fig. 2a is a schematic view of a cuboid magnet arrangement according to the invention.
  • FIG. 2b shows the scaling of a cuboid magnet arrangement according to the invention
  • FIG. 3 shows a schematic view of an optical Faraday rotator according to the invention with optical beam path
  • FIG. 4 shows a schematic view of a folded optical Faraday rotator according to the invention with optical beam path
  • FIG. 5 shows a schematic view of another folded optical Faraday rotator according to the invention with optical beam path
  • FIG. 6 shows a schematic view of another folded optical Faraday rotator according to the invention with optical beam path
  • Fig. 8 is a sectional view of magnets of an embodiment of the invention.
  • FIG. 9 Simulation of the integrated magnetic field along the optical axis according to FIG.
  • FIG. 10 a calculation of the strength of the magnetic field integrated along the optical axis as a function of the crystal length of the Faraday medium according to the embodiment according to the invention from FIG. 7;
  • FIG. 10 a calculation of the strength of the magnetic field integrated along the optical axis as a function of the crystal length of the Faraday medium according to the embodiment according to the invention from FIG. 7;
  • FIG. 7 is a schematic view of an embodiment according to the invention of magnets with chamfered outer corners of the magnet assembly;
  • Fig. 11b is a schematic view of another embodiment of the magnets with chamfered outer corners of the magnet assembly according to the invention.
  • Fig. 12 is a sectional view of magnets of another embodiment of the invention.
  • FIG. 14 calculation of the strength of the magnetic field integrated along the optical axis as a function of the crystal length of the Faraday medium according to the embodiment according to the invention from FIG. 11a;
  • FIG. 14 calculation of the strength of the magnetic field integrated along the optical axis as a function of the crystal length of the Faraday medium according to the embodiment according to the invention from FIG. 11a;
  • 16 shows a schematic view of a further magnet arrangement according to the invention, consisting of 12 cuboid magnets
  • 17 shows an inventive embodiment of a compact cuboidal magnet arrangement for 2 rod-shaped Faraday media with spacers in the free one
  • FIGS. 1a and 1b are arrangements of the prior art, the magnet arrangement (1) consisting of cylindrical magnets (2) having an aperture (3) and a Faraday medium (4) in the aperture (3). consists.
  • FIGS. 2-22 are embodiments according to the invention of the optical Faraday rotator and its components.
  • FIG. 2a is a schematic representation of the magnet assembly (1) consisting of parallelepiped magnet (2), which generates an aperture (3) corresponding to the diameter of the Faradaymediums (4).
  • FIG. 2b shows an embodiment of the magnet arrangement (1) consisting of parallelepiped magnets (2) which produce an aperture (3) which corresponds in one direction to twice the diameter of a Faraday medium (4), so that two Faraday media (4) are arranged side by side within the Aperture (3) can be arranged.
  • Figures 3 - 6 show schematic views of various embodiments of the optical Faraday rotator (5) according to the invention, consisting of a magnet assembly (1) and a Faradaymedium (4) with the optical beam path (6).
  • the Faraday rotator (5) can also be passed through folding by means of folding elements (7) two or more times, as for example in the embodiments shown in Figures 4, 5 and 6.
  • the length in which a strong magnetic field has to be generated in the free aperture (3) can be divided by three than the linear arrangement, which further reduces the size of the necessary magnet arrangement (1).
  • FIG. 7 is a schematic representation of a magnet assembly (1) according to the invention, which consists of 8 cuboid magnets (2), and a cuboid magnet (2) with a bore.
  • a magnet assembly (1) which consists of 8 cuboid magnets (2), and a cuboid magnet (2) with a bore.
  • three magnetic planes (8, 8 ', 8 ") are formed, wherein the first and third plane (8, 8") is composed of 4 parallelepiped magnets (2) and the second (middle) plane (8') through the Magnet (2) is formed with the bore.
  • the size of the hole corresponds to the free aperture (3) of the enclosing magnetic planes (8, 8 "), which in turn corresponds in one direction to twice the diameter of the Faraday medium (4), so that two Faraday media (4) can be arranged side by side.
  • FIGS. 11a and 11b show further embodiments of the magnet arrangement (1) according to the invention.
  • the cuboid magnets (2) of the magnet assembly (1) are chamfered at the outer corners of the assembly (1), whereby the edge lengths A and B are shortened by one part and thus have an edge length of A 'and B'.
  • Figure 12 With the dimensions of the magnets (2) shown in Figure 12 is a very homogeneous, integrated along the optical axis, magnetic field with a deviation of less than 3.5% over the height and width of 3 mm, and less than 1% over a height and width of 1, 5 mm reached.
  • Figures 13-15 show the associated simulations and calculations analogous to the previous embodiment.
  • the inventive embodiment of the magnet assembly (1) shown in Figure 16 consists of 12 cuboid magnets (2), in turn, three magnetic planes (8, 8 ', 8 ") are formed, which in the present embodiment of four parallelepiped magnets (2) composed This offers the advantage of a simple and thus inexpensive manufacturability of the magnets (2).
  • the inventive embodiment of the magnet arrangement (1) shown in FIG. 17 consists of parallelepiped magnets (2) with spacers (9) in the free aperture (3), in which two Faraday media (4) are arranged by way of example here.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

La présente invention concerne un rotateur de Faraday optique pour un rayonnement optique de grande puissance. Ce système de rotateur de Faraday optique est constitué d'un ou de plusieurs milieux de Faraday (4) et d'un ensemble d'aimants (1) permettant de recevoir plusieurs milieux de Faraday (4) dans une ouverture. L'invention se caractérise en ce que l'ensemble d'aimants (1) est constitué d'aimants (2) parallélépipédiques.
PCT/DE2010/000285 2009-04-09 2010-03-15 Ensemble de plusieurs aimants pour rotateur de faraday WO2010115393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009016949.0A DE102009016949B4 (de) 2009-04-09 2009-04-09 Faraday-Rotator und Anordnung
DE102009016949.0 2009-04-09

Publications (1)

Publication Number Publication Date
WO2010115393A1 true WO2010115393A1 (fr) 2010-10-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2010/000285 WO2010115393A1 (fr) 2009-04-09 2010-03-15 Ensemble de plusieurs aimants pour rotateur de faraday

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DE (1) DE102009016949B4 (fr)
WO (1) WO2010115393A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021113181A1 (de) 2021-05-20 2022-11-24 Trumpf Laser Gmbh Magnetvorrichtung und Faraday-Rotator

Citations (7)

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JPH11258549A (ja) * 1998-03-12 1999-09-24 Tokin Corp 光サーキュレータ
JP2002196282A (ja) * 2000-12-27 2002-07-12 Nec Tokin Corp 光アイソレータ
JP2003167217A (ja) * 2001-11-29 2003-06-13 Kyocera Corp 光アイソレータおよびそれを用いた光デバイス
JP2003222824A (ja) * 2002-01-29 2003-08-08 Sumitomo Metal Mining Co Ltd 光アイソレータ
US7161452B1 (en) * 2005-03-02 2007-01-09 The United States Of America As Represented By The Secretary Of The Army Magnet for a Faraday rotator
JP2007171326A (ja) * 2005-12-20 2007-07-05 Seikoh Giken Co Ltd 光アイソレータ
JP2007248779A (ja) * 2006-03-15 2007-09-27 Murata Mfg Co Ltd 光アイソレータ

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US5047743A (en) * 1988-01-22 1991-09-10 Scesney Stanley P Integrated magnetic element
JPH0387814A (ja) * 1989-08-31 1991-04-12 Seiko Instr Inc 光アイソレータ
US5382936A (en) * 1992-06-02 1995-01-17 The United States Of America As Represented By The Secretary Of The Army Field augmented permanent magnet structures
US5528415A (en) 1994-11-09 1996-06-18 Duke University Compact enhanced performance optical isolator using a faraday rotator
JPH10227996A (ja) * 1997-02-14 1998-08-25 Sumitomo Metal Mining Co Ltd 光アイソレータ
AU2321800A (en) * 1999-01-29 2000-08-18 Nec Tokin Corporation Optical isolator comprising a faraday rotator
US6462872B2 (en) * 2000-03-22 2002-10-08 Shin-Etsu Chemical Co., Ltd. Optical isolator
JP2002116421A (ja) * 2000-10-04 2002-04-19 Fdk Corp 旋光器及びそれを用いた光デバイス
US6906843B2 (en) * 2002-05-22 2005-06-14 Fdk Corporation Ferrule attachment type optical isolator, and manufacturing method thereof
US20060013076A1 (en) * 2002-11-15 2006-01-19 Sumitomo Metal Mining Co., Ltd. Magnetooptic element and process for fabricating the same and optical isolator incorporating it
DE10333570A1 (de) 2003-07-23 2005-06-09 Linos Photonics Gmbh & Co. Kg Faradayrotator
JP2007333899A (ja) * 2006-06-13 2007-12-27 Murata Mfg Co Ltd 磁気光学デバイスおよび光アイソレータ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11258549A (ja) * 1998-03-12 1999-09-24 Tokin Corp 光サーキュレータ
JP2002196282A (ja) * 2000-12-27 2002-07-12 Nec Tokin Corp 光アイソレータ
JP2003167217A (ja) * 2001-11-29 2003-06-13 Kyocera Corp 光アイソレータおよびそれを用いた光デバイス
JP2003222824A (ja) * 2002-01-29 2003-08-08 Sumitomo Metal Mining Co Ltd 光アイソレータ
US7161452B1 (en) * 2005-03-02 2007-01-09 The United States Of America As Represented By The Secretary Of The Army Magnet for a Faraday rotator
JP2007171326A (ja) * 2005-12-20 2007-07-05 Seikoh Giken Co Ltd 光アイソレータ
JP2007248779A (ja) * 2006-03-15 2007-09-27 Murata Mfg Co Ltd 光アイソレータ

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Publication number Publication date
DE102009016949B4 (de) 2021-02-04
DE102009016949A1 (de) 2010-10-14

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