CN2298532Y - Novel continuously variable optical attenuator - Google Patents
Novel continuously variable optical attenuator Download PDFInfo
- Publication number
- CN2298532Y CN2298532Y CN 97203468 CN97203468U CN2298532Y CN 2298532 Y CN2298532 Y CN 2298532Y CN 97203468 CN97203468 CN 97203468 CN 97203468 U CN97203468 U CN 97203468U CN 2298532 Y CN2298532 Y CN 2298532Y
- Authority
- CN
- China
- Prior art keywords
- magnet
- wedge
- optical medium
- optical attenuator
- optical
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims description 8
- 230000000295 complement effect Effects 0.000 claims description 3
- 229910021532 Calcite Inorganic materials 0.000 claims description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052771 Terbium Inorganic materials 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 239000002223 garnet Substances 0.000 claims description 2
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 claims description 2
- 230000010287 polarization Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
Abstract
The utility model relates to a but continuous variation's optical attenuator. The optical attenuator is characterized in that a wedge is symmetrically fixed on one side of two light-passing surfaces of a magneto-optical medium, the wedge is placed in a non-magnetic metal sleeve and then is placed in a magnet cavity of a metal outer sleeve, and the metal outer sleeve and the magnet cavity are fixed together by two adjusting threaded bolts to form the continuously variable optical attenuator. The utility model discloses simple structure, output light is continuously variable, and output energy also can be continuously variable, and the loss is very little.
Description
The utility model relates to a kind of optical device, but particularly a kind of continually varying optical attenuator.
In classical optics is used, be the luminous energy of decaying continuously, usually in light path, place two polarizers, as polaroid or Glan prism etc., its logical light face is perpendicular to direction of beam propagation, by regulate two polarization axles between the polarizer to, promptly one of them polarizer is the axle rotation with the radiation direction, if the polarization axle of two polarizers is θ to angle, its transmitance is T=cos
2θ, θ=0 when the polarization axle of two polarizers is parallel, then transmitance is very big; θ=90 ° when two polarizer polarization axles are orthogonal, then transmitance is minimum.The advantage of this method is to continuously change luminous energy.Its shortcoming is that first polarizer will make natural light lose 50% luminous energy.That is, when having only linearly polarized light to be light source, just may obtain maximum value (when not considering surface loss and reaching the receipts loss) near 100%.If when adopting polaroid, it can't bear high power density.Described in the 226th page of textbook " optics " Ai Dixunweilai publishing company version in 1974.
In classical optics was used, the another kind of method of decay luminous energy was to put into several pieces neutral density glass attenuators in light path.This absorbability attenuator is processed into different-thickness, each sheet has different transmitances, during use, adopt various combination, to obtain different transmitances, thereby the change beam energy, but this method can not continuously change luminous energy, and can not bear high power (damage threshold that is absorption-type glass is not high).
Also have a kind of method such as document M. Born, E. Wo Erfu shows " optical principle " Chinese translation, Science Press's version in 1978 is described: adopt vacuum coating technology, be coated with the catoptron of different reflectivity, thereby obtain different reflective light intensities, be characterized in that reflectivity can not change continuously, but can bear high power.And metal-coated membrane then can not bear high power.
The purpose of this utility model is to overcome the shortcoming and defect of prior art, did the loss of optical attenuator in order to overcome in the past with polarizer to nonpolarized light, and do the defective that attenuator can not bear high power density with common polaroid, the shortcoming that the neutral density glass attenuator brings different reflectivity to decay continuously, thus provide a kind of can the decay continuously also can bear high-power attenuator.
The purpose of this utility model is finished like this:
The utility model comprises: two birefringent wedges, magnet-optical medium, no magnetic metal sleeve, magnet bore, minute adjustment screwed plug, overcoat and set bolts are formed, the logical light face angle of its two birefringent wedges is 6～8 degree, two wedges symmetry is placed, each fixes a wedge to two logical light faces of magnet-optical medium on one side, its logical light face and wedge two logical light face inclination angles are complementary, and its two sides is fixed together; Wedge that fixes and magnet-optical medium are put into no magnetic metal sleeve, and magnet bore is contained in the metal shell, with the termination set bolt metal shell and magnet bore is fixed together.The no magnetic metal sleeve that wedge and magnet-optical medium are housed is put into magnet bore, and no magnetic metal sleeve two ends are fixed by two minute adjustment bolt lines, and two minute adjustment bolt lines are fixed on two termination bolts.
Advantage of the present utility model is:
1. the continuous adjustable beam attenuator of magneto-optic is applicable to the light beam (comprising nonpolarized light) of random polarization direction, if do not consider surface reflection loss, absorption loss, its transmitance can be from 100% monotone variation to 0%.Its both sides two bundle polarization state of light are orthogonal in addition, and two bundle light intensities are except that depending on the position of optics in the magnetic cavity body, and are also relevant with the polarization of incident light direction.And adopting polaroid or Glan prism to make the beam energy attenuator usually, its first polarizer will make nonpolarized light loss 50%, that is when not considering reflection loss and absorption loss, its maximum transmitance also has only 50%.
2. the loss of magneto-optic continuous variable optical attenuator is very little, because of not having air-gap between magneto-optical crystal and the wedge, that is its refractive index gradient is less, and have only two interfaces and air to join, therefore reflection loss is very little, and when adopting polaroid or Glan prism, reflection loss also increases because the interface is many.
3. magneto-optic continuous variable optical attenuator is except that along elementary beam direction light energy output can continuously change, and the mutually perpendicular light of its other two bundle polarization states is in addition exported, and its output energy can continuously change too.
4. this device is when light beam output in center reaches maximum value, then become the optoisolator with polarization irrelevant, and when using optical wavelength to change, because useless your the German number of magneto-optical crystal is different, as long as regulate the position of optics in magnetic cavity a little, can obtain the optoisolator of different wave length.
5. the utility model is simple in structure, and easily produces in batches.
The present invention will be described in detail below in conjunction with accompanying drawing and specific embodiments:
But Fig. 1 continually varying optical attenuator structural representation
But Fig. 2 continually varying optical attenuator light path principle figure
1--regulates bolt 2--set bolt 3--wedge 4--magnet-optical medium
5--does not have magnetic metallic sheath 6--magnet bore 7--metal shell 8--output facula
Specific embodiments is pressed Fig. 1 preparation, adopt calcite crystal (or other single axial birefringence crystal) processing birefringent wedge (3), about 6～8 degree of wedge (3) two logical light face angles, its crystallographic axis is positioned at incident end face and vertical with the plane of incidence of light, and when requiring two wedges (3) symmetries to place, the crystal axis of two wedges (3) is to becoming 45 degree.Adopting terbium gallium garnet crystal (TGG) is magnet-optical medium (4), and the about 10～20mm of magnet-optical medium (4) length, the logical light face of magnet-optical medium (4) are processed into the inclination angle that is complementary with wedge (3), and polishing.Kalzit wedge (3) and TGG magnet-optical medium (4) are used up (or glue together with optics) glued together by Fig. 1, in the no magnetic German alloy silver tube (5) of the suitable dimension of packing into, and place in the magnet bore (6).Put into metal shell (7) again, regulate bolt (1) and fix with no magnetic metallic sheath German alloy silver tube (5) screw thread, it is fixing by set bolt (2) with overcoat (7) to regulate bolt (1).As long as regulate two ends precision bolt (1) simultaneously, change the front and back position of German alloy silver tube (5) in magnet bore (6), thereby change the relative position of optical element in neodymium iron boron magnetic body chamber (6), but obtain the continually varying light intensity.
Claims (3)
1. but a continually varying optical attenuator is characterized in that comprising: two birefringent wedges, magnet-optical medium, no magnetic metal sleeve, magnet bore, minute adjustment screwed plug, overcoat and set bolts, the logical light face angle of its two birefringent wedges is 6～8 degree, two wedge symmetries are placed on two each one side of logical light faces of magnet-optical medium, logical light face of magnet-optical medium and wedge two logical light face inclination angles are complementary, and its two sides is fixed together; Wedge that fixes and magnet-optical medium are put into no magnetic metal sleeve, magnet bore is contained in the metal shell, with the termination set bolt metal shell and magnet bore are fixed together, the no magnetic metal sleeve that wedge and magnet-optical medium are housed is put into magnet bore, and no magnetic metal sleeve two ends fixedly are made up of two minute adjustment bolt lines.
2. but by the described continually varying optical attenuator of claim 1, it is characterized in that described birefringent wedge (3) is to use calcite crystal.
3. but by the described continually varying optical attenuator of claim 1, it is characterized in that described magnet-optical medium (4) is by terbium gallium garnet crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97203468 CN2298532Y (en) | 1997-04-15 | 1997-04-15 | Novel continuously variable optical attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97203468 CN2298532Y (en) | 1997-04-15 | 1997-04-15 | Novel continuously variable optical attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2298532Y true CN2298532Y (en) | 1998-11-25 |
Family
ID=33924324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97203468 Expired - Fee Related CN2298532Y (en) | 1997-04-15 | 1997-04-15 | Novel continuously variable optical attenuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2298532Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096210A (en) * | 2010-11-22 | 2011-06-15 | 福建福晶科技股份有限公司 | Faraday optoisolator used in wide band |
| CN102445112A (en) * | 2011-11-15 | 2012-05-09 | 长春理工大学 | Dual-range simulator based on double optical wedges |
| CN101649488B (en) * | 2009-08-18 | 2013-03-20 | 元亮科技有限公司 | Synthesizing method for growing terbium gallium garnet crystal by pulling method |
-
1997
- 1997-04-15 CN CN 97203468 patent/CN2298532Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649488B (en) * | 2009-08-18 | 2013-03-20 | 元亮科技有限公司 | Synthesizing method for growing terbium gallium garnet crystal by pulling method |
| CN102096210A (en) * | 2010-11-22 | 2011-06-15 | 福建福晶科技股份有限公司 | Faraday optoisolator used in wide band |
| CN102445112A (en) * | 2011-11-15 | 2012-05-09 | 长春理工大学 | Dual-range simulator based on double optical wedges |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1253726A (en) | Polarization rotation compensator and optical isolator using the same | |
| JP2710451B2 (en) | Polarization independent optical isolator | |
| US7426325B2 (en) | Compact, high power, fiber pigtailed faraday isolators | |
| EP0396308B1 (en) | Optical isolator | |
| CA1259835A (en) | Optical systems with antireciprocal polarization rotators | |
| CN102798989B (en) | The light partition method of Faraday method and device and this device of use and device | |
| US5715080A (en) | Compact uniform field Faraday isolator | |
| US4909612A (en) | Optical isolator employing multipass faraday rotation | |
| CA2265236A1 (en) | Polarizing beam splitter/combiner | |
| CA1308284C (en) | Optical systems with thin film polarization rotators and method for fabricating such rotators | |
| CA2011829A1 (en) | Quasi-achromatic optical isolators and circulators using prisms with total internal fresnel reflection | |
| CN102830499B (en) | Vector light field converter and polarized light converting method | |
| CN1184259A (en) | Optical device utilizing magneto-optical effect | |
| ATE27203T1 (en) | MAGNETO-OPTICAL CONVERTER. | |
| CN2298532Y (en) | Novel continuously variable optical attenuator | |
| US3663087A (en) | Device for improving the homogeneity of a laser beam | |
| EP1031872A4 (en) | Application of light source including light guide for emanating linearly polarized light to liquid crystal display | |
| EP0757275A4 (en) | Optical isolator | |
| US4274710A (en) | Optical wave circulators | |
| CN108710223A (en) | A kind of all -fiber magnetic-optic devices | |
| JPH0477713A (en) | Optical isolator independent of polarization | |
| JPS6158810B2 (en) | ||
| RU2759577C1 (en) | Method for reflecting laser beams maintaining the polarisation and reflector based thereon | |
| Fujii | Polarization-independent optical circulator having high isolation over a wide wavelength range | |
| CN2253487Y (en) | Full optical fiber optical isolator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |