CN201945766U - TGG Faraday rotator - Google Patents
TGG Faraday rotator Download PDFInfo
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- CN201945766U CN201945766U CN2011200360865U CN201120036086U CN201945766U CN 201945766 U CN201945766 U CN 201945766U CN 2011200360865 U CN2011200360865 U CN 2011200360865U CN 201120036086 U CN201120036086 U CN 201120036086U CN 201945766 U CN201945766 U CN 201945766U
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- faraday
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Abstract
The utility model relates to a TGG Faraday rotator which is characterized in that a magnet body consists of a first magnet, a second magnet and a third magnet, and when the length of the first magnet and the length of the second magnet in the optic axis direction are the same and both set to be L2, and the length of the third magnet in the optic axis direction is set to be L3, the following relation is established: L3 is more than or equal to L2/5 and less than or equal to L2/2. In the utility model, as a TGG crystalloid is adopted as a Faraday component, the defect that the rotator is not durable near the wavelength of 1 micrometer as traditional RIG (rare earth iron garnet) is taken as the Faraday component can be overcome; in addition, the length of the Faraday component in the optic axis direction can be reduced, so that the Faraday rotator can be further miniaturized.
Description
Technical field
The utility model relates to a kind of magnetooptics equipment that uses in optical communication system, laser-processing system etc., relate in particular to the Faraday polarization apparatus of use in optoisolator etc.
Background technology
Faraday polarization apparatus is a function element, have by faraday components and be used for applying magnetic field to produce the magnet of Faraday effect to this faraday components, be used for optoisolator equimagnetic optical device, wherein, described optoisolator uses in optical communication system, laser-processing system etc., be used to interdict to semiconductor laser return reflective, make its laser generation stable.
Fig. 1 is the cut-open view of the present basic Faraday polarization apparatus that uses in optical communication system.Reference numeral 5 among the figure is magnetized on optical axis direction (black arrow) permanent magnets (magnet body), and its shape is generally cylindrical shape, is inserted with faraday components 6 in its through hole.Faraday components 6 produces Faraday effect because of the magnetic field of the optical axis direction in the through hole of permanent magnet 5.In the past, the wave band of the light that uses in optical communication system mainly was 1.3～1.7 μ m, in optoisolator, was inserted in the permanent magnet as faraday components with the rare earth, iron garnet film, and this is used as Faraday rotator.
In recent years, more and more need to be used to protect to excite the optoisolator of processing machine, but light wavelength is the wavelength shorter than optical communicating waveband as used herein, mainly is near the wavelength the 1 μ m with the employed semiconductor laser of fiber laser.But near the wavelength the 1 μ m, the rare earth, iron garnet film is not durable, and has therefore limited optoisolator application in this respect greatly.
Especially, when Faraday polarization apparatus was used for optoisolator, making polarization surface rotation, its anglec of rotation (hereinafter referred to as faraday's rotation angle) by Faraday effect must be 45 degree (below be labeled as 45 °).
When the length of establishing faraday components is that L, Verdet constant are the magnetic field of V, optical axis direction when being H, faraday rotation angle=V * L * H.
The Verdet constant of faraday components is spatially constant, and the magnetic field of the optical axis direction that produces by magnet is not necessarily constant in the space, therefore, and faraday's rotation angle=∑ V * H (L) * Δ L in fact.
Yet, because the Verdet constant of magnet is little, make the ability of plane of polarization rotation little, therefore need big magnetic field, the result needs above-mentioned magnet long and big on optical axis direction, simultaneously it is permanent magnet magnetizedly also become huge, thereby the cost straight line rises.
The utility model content
In view of this, the utility model proposes a kind of miniaturization, adopt the Faraday polarization apparatus of TGG crystal as faraday components, to achieve these goals, concrete technical scheme of the present utility model is: a kind of TGG Faraday polarization apparatus, have magnet body and TGG faraday components, wherein, above-mentioned magnet body has the through hole that light is passed through at the center, above-mentioned faraday components is configured in this through hole and has the paramagnetic substance that light is passed through, this Faraday rotator is characterised in that, above-mentioned magnet body is by first magnet, second magnet and the 3rd magnet constitute, wherein, above-mentioned first magnet, its direction of magnetization is vertical with optical axis, and on the direction of optical axis, be magnetized, above-mentioned second magnet, its direction of magnetization is vertical with optical axis, and is magnetized in the direction of leaving from optical axis, above-mentioned the 3rd magnet configuration is between above-mentioned first magnet and second magnet, and its direction of magnetization is parallel with optical axis and be magnetized from the direction of second magnet towards first magnet; Be provided with the hole portion of the through hole that constitutes above-mentioned magnet body at each center of above-mentioned first magnet, second magnet and the 3rd magnet, and, and be L when the length of the optical axis direction of first magnet and second magnet at the length direction central portion of the through hole that constitutes by these hole portions configuration faraday components
2, the length of the optical axis direction of the 3rd magnet is L
3The time, following relational expression is set up: L
2/ 5≤L
3≤ L
2/ 2.
The utility model is by adopting the TGG crystal as faraday components, overcome near the short-life defective of wavelength 1 μ m that adopts traditional rare earth class iron garnet to cause as faraday components, in addition, parallel with optical axis and by direction of magnetization in effect from second magnet magnetized above-mentioned the 3rd magnet on the direction of first magnet, can further improve the magnetic field intensity that faraday components is applied, therefore can reduce the length dimension of the optical axis direction of faraday components, make Faraday polarization apparatus miniaturization further.
Description of drawings
Fig. 1 is the schematic structure cut-open view of the basic Faraday polarization apparatus that uses in optical communication system.
Fig. 2 is the schematic cross sectional views of TGG Faraday polarization apparatus of the present utility model.
Fig. 3 is the schematic cross sectional views of the TGG Faraday polarization apparatus of the utility model specific embodiment.
Fig. 4 is the schematic cross sectional views of first magnet of Fig. 3.
Embodiment
Below, specify embodiment of the present utility model with reference to accompanying drawing.
Fig. 2 represents the cut-open view of the TGG Faraday polarization apparatus of present embodiment.In Fig. 2, Reference numeral 1,2 and 3 expressions, first magnet, second magnet, the 3rd magnet are represented its direction of magnetization with black arrow.In addition, porose (through hole) is set at the center of each magnet.
In addition, first magnet 1 is vertical with optical axis and magnetize from the lateral optical axis.On the other hand, the direction of magnetization of second magnet 2 is vertical with optical axis, but is magnetizing from the direction in the optical axis direction outside on the contrary with first magnet 1.In addition, the 3rd magnet 3 is configured between first magnet 1 and second magnet 2, and direction of magnetization is parallel with optical axis and be magnetized in the direction from second magnet, 2 to first magnet 1.
In addition, TGG faraday components 4 is configured in the central portion of the length direction of being located at the hole portion (through hole) on first magnet 1, second magnet 2 and the 3rd magnet 3.
Magnet is the Nd-Fe-B sintered magnet, and faraday components uses the columned TGG of diameter as 3mm, and this element can be purchased from Fujian second best plan Electro-optical Technology, INC. (US) 62 Martin Road, Concord, Massachusetts 017.As shown in Figure 4, first magnet 1 forms magnetized form on the direction vertical with the optical axis standard by 6 flat thin magnets.In addition, second magnet 2 also is made of 6 flat thin magnets with first magnet, 1 same thickness, and direction of magnetization is opposite with first magnet and parallel.
If light wavelength is 1064nm, TGG faraday rotation angle is the external diameter L of three magnet of 45 °
1Be 28mm, the optical axis direction length L of first magnet 1 and second magnet 2
2Optical axis direction length L for 10mm, the 3rd magnet 3
3Be the crystallization length C on the optical axis of 4mm and TGG, Fig. 3 represents the relation of L1～L3 and C.According to The above results, made the TGG Faraday polarization apparatus of three these embodiment, used wavelength faraday's rotation angle to be estimated evaluation result as the optical-fiber laser of 100mW as 1064nm, light intensity, faraday's rotation angle is 45 ± 1 °, is good rotation angle.
By the foregoing description as can be known, TGG Faraday polarization apparatus of the present utility model extremely is fit to miniaturization, therefore, has the utilizability on the following industry, promptly, can be applicable on the optoisolator equimagnetic optical device that in optical communication system, laser-processing system etc., uses, be used to interdict the light that returns to semiconductor laser, make this laser generation stable.
Claims (2)
1. TGG Faraday polarization apparatus, have magnet body and TGG faraday components, wherein, above-mentioned magnet body has the through hole that light is passed through at the center, above-mentioned faraday components is configured in this through hole and has the paramagnetic substance that light is passed through, this Faraday rotator is characterised in that, above-mentioned magnet body is by first magnet, second magnet and the 3rd magnet constitute, wherein, above-mentioned first magnet, its direction of magnetization is vertical with optical axis, and is being magnetized on the direction of optical axis, above-mentioned second magnet, its direction of magnetization is vertical with optical axis, and be magnetized in the direction of leaving from optical axis, above-mentioned the 3rd magnet configuration is between above-mentioned first magnet and second magnet, and its direction of magnetization is parallel with optical axis and be magnetized from the direction of second magnet towards first magnet; Be provided with the hole portion of the through hole that constitutes above-mentioned magnet body at each center of above-mentioned first magnet, second magnet and the 3rd magnet, and, and be L when the length of the optical axis direction of first magnet and second magnet at the length direction central portion of the through hole that constitutes by these hole portions configuration faraday components
2, the length of the optical axis direction of the 3rd magnet is L
3The time, following relational expression is set up: L
2/ 5≤L
3≤ L
2/ 2.
2. Faraday polarization apparatus according to claim 1 is characterized in that: described first magnet and second magnet are combined by a plurality of flat thin magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200360865U CN201945766U (en) | 2011-01-30 | 2011-01-30 | TGG Faraday rotator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200360865U CN201945766U (en) | 2011-01-30 | 2011-01-30 | TGG Faraday rotator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201945766U true CN201945766U (en) | 2011-08-24 |
Family
ID=44473106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200360865U Expired - Fee Related CN201945766U (en) | 2011-01-30 | 2011-01-30 | TGG Faraday rotator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201945766U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105247405A (en) * | 2013-04-01 | 2016-01-13 | 信越化学工业株式会社 | Faraday rotator and light isolator using faraday rotator |
| CN106773149A (en) * | 2017-03-30 | 2017-05-31 | 中山市飞云电子科技有限公司 | A kind of high power yttrium iron garnet Faraday optical rotator |
-
2011
- 2011-01-30 CN CN2011200360865U patent/CN201945766U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105247405A (en) * | 2013-04-01 | 2016-01-13 | 信越化学工业株式会社 | Faraday rotator and light isolator using faraday rotator |
| CN106773149A (en) * | 2017-03-30 | 2017-05-31 | 中山市飞云电子科技有限公司 | A kind of high power yttrium iron garnet Faraday optical rotator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20140130 |