CN104914589B - A kind of monochromatic light proportion adjustable polarization-independent beam splitting device - Google Patents
A kind of monochromatic light proportion adjustable polarization-independent beam splitting device Download PDFInfo
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- CN104914589B CN104914589B CN201510379067.5A CN201510379067A CN104914589B CN 104914589 B CN104914589 B CN 104914589B CN 201510379067 A CN201510379067 A CN 201510379067A CN 104914589 B CN104914589 B CN 104914589B
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- 230000010287 polarization Effects 0.000 title claims abstract description 21
- 239000011521 glass Substances 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 description 8
- 101100232265 Candida albicans (strain SC5314 / ATCC MYA-2876) HWP2 gene Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000000644 propagated effect Effects 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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Abstract
The invention discloses a kind of monochromatic light proportion adjustable polarization-independent beam splitting device, it includes：The 5 pieces of pattern displacement device BD set gradually, are designated as BD1~BD5；Wherein, incident light inject BD1 after, be divided into above and below two beams；Two-beam is corresponding by injecting BD2 after half-wave plate and glass compensating plate respectively up and down, by BD2 walk off effect so that above and below two-beam translate downwards；Two-beam will be respectively divided into two beams by two-beam, as the four bundles light being distributed from up to down up and down respectively through BD3 is injected after corresponding half-wave plate by BD3 up and down；This four bundles light by half-wave plate inject BD4, middle two-beam is combined into by BD4 it is a branch of, as the three-beam being distributed from up to down；This three-beam is corresponding respectively to inject BD5 after half-wave plate, glass compensating plate and half-wave plate, by BD5 middle light beam is merged with two-beam up and down respectively, merged into above and below project after two-beam.Beam splitter disclosed by the invention, can be achieved the regulation of arbitrary proportion beam splitting, and with higher precision.
Description
Technical field
The present invention relates to optical technical field, more particularly to a kind of monochromatic light proportion adjustable polarization-independent beam splitting device.
Background technology
Beam splitter is the basic device of various optical instruments and experiment, light beam can be divided into two-beam or can
So that two-beam is merged into light beam, the unrelated beam splitter of the polarization of present spatial light main flow is the light beam of surface coating type
Beam splitter (Beam Spliter abbreviation BS), is divided into two kinds：One kind is 45 degree type BS, but is due to that present coating process is difficult
By reflection and transmission film plate it is fine, it is impossible to control ratio well, and often the BS of this film-coating type can only accomplish to o light
(ordinary light) 50:50, or to e light (extraordinary ray) 50:50, and can not reach simultaneously；Another BS is 0 degree of reflection BS, this
Kind of BS can accomplish good splitting ratio, but be due to 0 degree of reflection so having many inconvenience when practical application；And this
Two kinds of BS cannot adjust the ratio of its light splitting, it is impossible to realize the regulation of arbitrary proportion.
More accurate and adjustable splitting ratio, such as optics are generally required in actual optical instrument or Experiments of Optics
In most common MZ interferometers, if necessary to observe that it is unrelated that a relatively good interference visibility is accomplished by polarizing well
BS, to realize；Therefore need a kind of ratio adjustable, polarize unrelated, high-precision beam splitter realizes that some are high-precision
Beam splitting.
The content of the invention
It is an object of the invention to provide a kind of monochromatic light proportion adjustable polarization-independent beam splitting device, arbitrary proportion beam splitting can be achieved
Regulation, and with higher precision.
The purpose of the present invention is achieved through the following technical solutions：
A kind of monochromatic light proportion adjustable polarization-independent beam splitting device, including：The 5 pieces of pattern displacement device BD set gradually, are designated as
BD1~BD5；Wherein, one block of half-wave plate and one piece of glass compensating plate are provided between BD1 and BD2, two pieces are provided between BD2 and BD3
Half-wave plate, provided with one block of half-wave plate between BD3 and BD4, is provided with two blocks of half-wave plates and one piece of glass compensating plate between BD4 and BD5；
Incident light inject BD1 after, be divided into above and below two beams；Two-beam is distinguished corresponding process half-wave plate and mended with glass up and down
Repay and BD2 injected after piece, by BD2 walk off effect so that above and below two-beam translate downwards；Two-beam is respectively through phase up and down
BD3 is injected after the half-wave plate answered, two beams will be respectively divided into by two-beam by BD3 up and down, as the four bundles light being distributed from up to down；This
Four bundles light by half-wave plate inject BD4, middle two-beam is combined into by BD4 it is a branch of, as the three-beam being distributed from up to down；This
Three-beam is corresponding respectively to inject BD5 after half-wave plate, glass compensating plate and half-wave plate, is merged into this three-beam by BD5
Projected up and down after two-beam.
Further, the BD1~BD5, and half-wave plate and/or glass compensating plate between BD1~BD5 is parallel
Set.
Further, BD1, BD2 and BD5 are that large scale BD, BD3 and BD4 are small size BD；Wherein, large scale BD
Length be twice of small size BD length.
Further, the BD is natural birefringece crystal.
As seen from the above technical solution provided by the invention, on the one hand, by natural birefringece crystal to o light and
The walk-off effect of e light realizes the separation of o light and e light, and it has very high polarization beam splitting ratio, and can keep the flat of emergent light
Row degree；On the other hand, wave plate has been used to realize the regulation of light beam arbitrary proportion to the characteristic of Polarization Control, meanwhile, pass through block
Glass compensating plate ensures that the light path of light beam internally is definitely equal, so as to keep emergent light to have preferable coherence.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, being used required in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of schematic diagram of monochromatic light proportion adjustable polarization-independent beam splitting device provided in an embodiment of the present invention；
Fig. 2 is BD provided in an embodiment of the present invention structural representation.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
Embodiment
Fig. 1 is a kind of schematic diagram of monochromatic light proportion adjustable polarization-independent beam splitting device provided in an embodiment of the present invention.Such as Fig. 1
Shown, it mainly includes：
The 5 pieces of BD (beam displacer, pattern displacement device) set gradually, are designated as BD1~BD5；Wherein, BD1 and BD2
Between provided with one piece of half-wave plate (HWP1 in Fig. 1) and one piece of glass compensating plate (glass 1 in Fig. 1), be provided between BD2 and BD3
Two pieces of half-wave plates (HWP2~HWP3 in Fig. 1), provided with one piece of half-wave plate (HWP4 in Fig. 1) between BD3 and BD4, BD4 with
Provided with two pieces of half-wave plates (HWP5~HWP6 in Fig. 1) and one piece of glass compensating plate (glass 2 in Fig. 1) between BD5.
In the embodiment of the present invention, the BD is natural birefringece crystal, and light beam is incided and can produced on birefringece crystal
Raw two beams refraction light, they are propagated along different directions, and two-beam is become leaving crystal and waiting, have in crystal one it is special
Direction, will not occur birefringent phenomenon, so special direction claims when light is propagated in crystal along this special direction
The optical axis for crystal.
Exemplary, the embodiment of the present invention can use Iceland spar, as shown in Fig. 2 along with optical axis into 45 degree of angles ground
Side's cutting, o light and e light can be separated naturally afterwards, become parallel again into air dielectric after being propagated in crystal
Two parallel Shu Guang, the separated distance of two-beam and the wavelength of incident light and the length of crystal have relation, can be according to being actually subjected to
Ask and set.
In the such scheme of the embodiment of the present invention, natural birefringece crystal is make use of to o light and the walk-off effect of e light,
To realize the separation of o light and e light, because the distance walked off is according to the different and different of wavelength, therefore can be according to corresponding ripple
Long light can calculate the BD of needs length, depending on BD size is according to the size for the beam distance to be separated, it is necessary to big
Ensure that light beam can be all by BD in big twice BD separated distance.In the embodiment of the present invention, BD1, BD2 and BD5 are
Large scale BD, BD3 and BD4 are small size BD, and large scale BD length is twice of small size BD length.
In addition, being also provided with 6 blocks of half-wave plates and 2 pieces of glass compensating plates between BD1~BD5, polarization is controlled by half-wave plate
The characteristic of system realizes the regulation of light beam arbitrary proportion, and the purpose of setting glass compensating plate is to ensure the light beam inside device
Light path it is definitely equal, so as to keep emergent light that there is preferable coherence.
It is preferred that, above-mentioned BD1~BD5, and half-wave plate and/or glass compensating plate between BD1~BD5 is parallel set
Put, on the one hand, can make it that the light path of each light beam is as far as possible equal, on the other hand, it is also possible that emergent light has preferable phase
Dryness.
The composition structure and its principle of the monochromatic light proportion adjustable polarization-independent beam splitting device provided above for the present invention, below
Process for its beam splitting elaborates.
As shown in figure 1, incident light inject BD1 after, be divided into above and below two beams；Separated distance according to incident light wavelength and
It is exemplary depending on the length of crystal, it can be assumed that the distance that large scale BD (BD1, BD2 and BD5) is separated is 4 millimeters, small chi
The distance that very little BD (BD3 and BD4) separates is 2mm.
Two-beam distinguishes corresponding process half-wave plate (HWP1) and glass compensating plate (glass 1) up and down, herein, adjusts half-wave
Piece (HWP1) is to 45 degree of position so that be changed into e light after half-wave plate (HWP1) above for the light beam of o light；For following for e
The light beam of light then adds glass compensating plate (glass 1) row compensation.Its polarization direction is constant；Afterwards, BD2 is injected, by walking for BD2
From effect cause above and below two-beam translate downwards.
Two-beam is respectively through corresponding half-wave plate (HWP2~HWP3) up and down, and (HWP2~HWP3 is arrived regulation half-wave plate
22.5 degree of position, the effect of the two wave plates is that single horizontal polarization or the light polarized vertically are become into oblique at any angle
Polarised light, so as to realize the beam splitting of light beam arbitrary proportion by the two half-wave plates.
Exemplary, it can be realized by adjusting the rotational angle of half-wave plate.
Half-wave plate rotate Jones matrix formula be：
Wherein, x is the angle that wave plate is rotated, that is to say, that rotates the angle of some, can make the polarization side of linearly polarized light
To changing, it is assumed that horizontal polarization light is H light, vertical polarised light is V light, then a H light is by half-wave plate rotation, it is possible to
Become aH+bV, wherein a2+b2=1.So a branch of H light or V light will be divided into any by a half-wave plate, then during by BD3
The ratio needed, such as schematic diagram can see, and the splitting ratio of BD3 emergent lights directly just determines the beam splitting of last output two-port
Than, therefore HWP2 and HWP3 calculate angle according to ratio, reach the splitting ratio of needs.It should be noted that foregoing o light
Referred to e light for crystal, always the polarization direction of o light is vertical with optical axis, does not change with the direction of propagation and change
The light of change, e light changes from the angle of optical axis with the different of the direction of propagation；And H light and V herein is just relative to laboratory
Depending on coordinate, H light refers to the light polarized in the horizontal direction, and V light refers to the light polarized along vertical direction.Will experiment
It just can mutually be changed after the optical axis of room coordinate and crystal is unified, generally all be empirically room during due to description above mentioned problem
Coordinate description, therefore, herein also using H light with being described by the way of V light.
Afterwards, BD3 is injected, two beams will be respectively divided into by two-beam by BD3 up and down, as the four bundles light being distributed from up to down.
This four bundles light passes through half-wave plate, herein, adjusts half-wave plate (HWP4) to 45 degree of position so that all light polarization
Direction all changes 90 degree；Afterwards, inject BD4, middle two-beam is combined into by BD4 it is a branch of, as the three beams being distributed from up to down
Light.
This three-beam is corresponding respectively to inject BD5 after half-wave plate, glass compensating plate and half-wave plate, by BD5 by this three
Shu Guang is projected after two-beam above and below merging into.
Its merging process is as follows：Light beam only includes e light in this three-beam, and the second beam light had both included o light or had e light,
Three-beam only includes o light；Then enter after BD5, light beam can downward deviation, o light in the second beam light is along former side
To continuing to propagate, and be merged into the first beam light a branch of, and then downward deviation merges remaining e light with three-beam, finally with
Two-way light outgoing.
Such scheme of the embodiment of the present invention in terms of existing technologies, mainly has the following advantages that：
1) use natural birefringece crystal, be to the beam splitting of o light and e light it is natural there is very high polarization beam splitting ratio,
And the depth of parallelism of emergent light can be kept.
2) splitting ratio of light beam is controlled using half-wave plate, so can be carried out the beam splitting regulation of arbitrary proportion.
3) use natural birefringece crystal, as long as therefore convenient regulation keep crystal it is parallel can just construct it is this
Beam splitter.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (4)
1. a kind of monochromatic light proportion adjustable polarization-independent beam splitting device, it is characterised in that including：The 5 pieces of pattern displacements set gradually
Device BD, is designated as BD1~BD5；Wherein, be provided with one block of half-wave plate and one piece of glass compensating plate between BD1 and BD2, BD2 and BD3 it
Between provided with two blocks of half-wave plates, provided with one block of half-wave plate between BD3 and BD4, two blocks of half-wave plates and one piece are provided between BD4 and BD5
Glass compensating plate；
Incident light inject BD1 after, be divided into above and below two beams；Two-beam distinguishes corresponding process half-wave plate and glass compensating plate up and down
After inject BD2, by BD2 walk off effect so that above and below two-beam translate downwards；Two-beam is respectively through corresponding up and down
BD3 is injected after half-wave plate, two beams will be respectively divided into by two-beam by BD3 up and down, as the four bundles light being distributed from up to down；This four beam
Light by half-wave plate inject BD4, middle two-beam is combined into by BD4 it is a branch of, as the three-beam being distributed from up to down；This three beams
Light is corresponding respectively to inject BD5 after half-wave plate, glass compensating plate and half-wave plate, this three-beam is merged into by BD5 above and below
Projected after two-beam.
2. beam splitter according to claim 1, it is characterised in that the BD1~BD5, and half between BD1~BD5
Wave plate and/or glass compensating plate are to be arranged in parallel.
3. beam splitter according to claim 1, it is characterised in that BD1, BD2 and BD5 are large scale BD, BD3 and BD4
It is small size BD；Wherein, large scale BD length is twice of small size BD length.
4. beam splitter according to claim 1, it is characterised in that the BD is natural birefringece crystal.
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| CN201510379067.5A CN104914589B (en) | 2015-06-29 | 2015-06-29 | A kind of monochromatic light proportion adjustable polarization-independent beam splitting device |
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| CN201510379067.5A CN104914589B (en) | 2015-06-29 | 2015-06-29 | A kind of monochromatic light proportion adjustable polarization-independent beam splitting device |
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| CN104965309A (en) * | 2015-07-27 | 2015-10-07 | 西安交通大学 | Beam splitter, achieving any polarization state output, with beam splitting ratio being continuously adjustable |
| CN104965374B (en) * | 2015-07-28 | 2020-10-27 | 中国科学技术大学 | Preparation and judgment method of high-dimensional path entanglement source |
| CN105676463B (en) * | 2016-03-29 | 2018-04-10 | 中国科学技术大学 | The double-entry beam splitter bundling device of arbitrary proportion |
| JP6681320B2 (en) * | 2016-12-05 | 2020-04-15 | 信越化学工業株式会社 | Polarization-independent optical isolator |
| CN108628013B (en) * | 2017-03-15 | 2024-04-19 | 吕婧菲 | Optical phase conjugate mirror device |
| CN112198734A (en) * | 2020-05-09 | 2021-01-08 | 南京邮电大学 | Parameter-adjustable mixed state preparation method |
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| US6822793B2 (en) * | 1999-10-29 | 2004-11-23 | Finisar Corporation | Compact polarization insensitive circulators with simplified structure and low polarization mode dispersion |
| TW499591B (en) * | 2000-12-30 | 2002-08-21 | Ind Tech Res Inst | Apparatus and method for polarization independent acousto-optical tunable filtering |
| US6898336B2 (en) * | 2003-06-30 | 2005-05-24 | Intel Corporation | Fiber optic polarization beam combiner and splitter |
| US20140362676A1 (en) * | 2011-12-28 | 2014-12-11 | Electronics And Telecommunications Research Institute | Optical information processing apparatus and method for controlling same |
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