CN206905905U - A kind of big optical path difference interference with common path light-dividing device of high stable and its application system - Google Patents
A kind of big optical path difference interference with common path light-dividing device of high stable and its application system Download PDFInfo
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- CN206905905U CN206905905U CN201720230637.9U CN201720230637U CN206905905U CN 206905905 U CN206905905 U CN 206905905U CN 201720230637 U CN201720230637 U CN 201720230637U CN 206905905 U CN206905905 U CN 206905905U
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Abstract
The utility model proposes a kind of big optical path difference interference with common path light-dividing device of high stable and its application system.The common light path Sagnac interferometers that the big optical path difference interference with common path light-dividing device of the high stable uses is unsymmetric structures, the locus for the reflecting surface being total in light path Sagnac interferometers, which is set, causes the final light beam returned through beam-splitting surface in light path Sagnac interferometers altogether no longer to be overlapped with incident beam, but spatially parallel separation；Beam kept man of a noblewoman time light splitting of scoring obtains one-level light beam, and secondary light splitting obtains two level light beam；Then the light beam in the light path before secondary light splitting corresponding to spaced parallel separation is additionally provided with light path adjustment structure so that two-way one-level light beam finally produces optical path difference, is emitted with interfering beam.On this basis, the utility model also proposed high-throughout, high stability relevant dispersed light spectrum imaging system.
Description
Technical field
The utility model belongs to spectral imaging technology field, is related to a kind of big optical path difference interference with common path light splitting dress of high stable
Put.
Background technology
Spectral imaging technology, sometimes referred to as imaging spectral technology, have merged spectral technique and imaging technique, and intersection covers
A variety of subjects such as spectroscopy, optics, computer technology, electronic technology and precision optical machinery, the bidimensional that can obtain target simultaneously are empty
Between information and one-dimensional spectral information.Spectral imaging technology is widely used in military affairs, medical science, industry, agricultural, resource environment, air
Detection, astronomy etc., development are just in the ascendant.
Interference-type light splitting technology is the main light splitting type of one kind in spectral imaging technology.It can be divided into mikey in interference-type
Er Xun interference light splitting, Mach-Zahnder interference light splitting are divided type for the non-interference with common path of representative, and are interfered with Sagnac and be divided
Technology is divided type for the common light path of representative.The major advantage of non-interference with common path light splitting technology is that light path is relatively short, its
Two arms of interferometer are separated, and light beam is advanced in two arms, and the light path in the different then two-arm of brachium can not
Together, you can produce required optical path difference.But the interferometer formed often to interfere bar because of thermodynamics deformation and environmental change
Line is unstable.The route that interference with common path light splitting technology is then advanced due to two light beams separated in interferometer is identical or even complete
Full weight is closed, thus external environment thermodynamics deformation as caused by vibrations, temperature change etc. acts on two light beams simultaneously, therefore mutually
Offset so that interferometer is more reliable and more stable.
The canonical form of Sagnac interference light splitting technologies has two kinds, a kind of to be made up of two reflectings surface and beam-splitting surface,
Usually pentagonal prism type, (hereinafter referred to as three reflector types) that another kind is made up of three reflectings surface and beam-splitting surface.Tradition
Sagnac interference with common path instrument based on two reflectings surface is because optical path difference caused by shearing is smaller, while traditional three reflectings surface
Sagnac light splitting technologies, no matter in vacuum, air or other media, route that target light is advanced wherein is to overlap and identical
, optical path difference can not be produced.
For two reflector type Sagnac interferometers, change the position of one of reflecting surface, produce translation so that
This two reflectings surface are not symmetrical further referring to the beam splitter section in interferometer, then can form shearing displacement and produce optical path difference, but this
When optical path difference it is smaller.But for three reflector type Sagnac interferometers, compared to two reflector types, light beam multiple reflection one wherein
Secondary, the shearing displacement of formation is returned by compensation again, so no matter changing the position of any of which one or more reflecting surface, is produced flat
Line position is moved, all without generation optical path difference.Therefore, need to produce the common light path occasion of optical path difference in tradition, typical case is to use
Sagnac interferometers based on two reflector types, there is not yet producing the side of big optical path difference using three reflector type Sagnac interferometers
Case.
Therefore, the utility model proposes realize big optical path difference in two reflector types and three reflector type Sagnac interferometers
Technical scheme.
Utility model content
The utility model proposes a kind of common light path Sagnac of the big optical path difference of high stability to interfere light-dividing device.
The interference with common path light-dividing device of the big optical path difference of the high stability, done using the common light path Sagnac of unsymmetric structure
Interferometer, i.e., the locus of the reflecting surface in light path Sagnac interferometers is set so that final through light path Sagnac interferometers altogether altogether
The light beam that middle beam-splitting surface returns no longer overlaps with incident beam, but spatially parallel separation；
Beam kept man of a noblewoman time light splitting of scoring obtains one-level light beam, and secondary light splitting obtains two level light beam；The then light before secondary light splitting
Light beam on road corresponding to spaced parallel separation is additionally provided with light path adjustment structure so that two-way one-level light beam (transmitted light beam
And the reflected beams) optical path difference is finally produced, it is emitted with interfering beam.
Based on such scheme, the utility model has also further made following optimization：
Above-mentioned light path adjustment structure, different optical mediums, or increase path are specifically set up to change light path.
Above-mentioned light path adjustment structure is arranged on the transmitted light path after light splitting first, or is arranged at anti-after light splitting first
Penetrate in light path.
Above-mentioned optical medium is prism, and above-mentioned increase path is realized using arrangement of mirrors.
Between incident light source and the interference with common path light splitting optical path, preposition optical shaping system is additionally provided with (with reality
Now the collimation to incident light, the veiling glare that disappears etc. act on), mainly it is made up of lens and/or reflection device.
Above-mentioned beam-splitting surface is semi-transparent semi-reflective.
In the above-mentioned beam-splitting structure of light path Sagnac interferometers altogether, three reflectings surface and a semi-transparent semi-reflecting beam splitting mask body
The hollow form being made up of speculum and semi-transparent semi-reflecting beam splitter, or correspondingly plated on four faces respectively by same prism
Reflectance coating and semi-transparent semi-reflecting beam splitting coating composition.
Above scheme is not only suitable for pentagonal prism type, is also applied for three reflector types.
The utility model also applies the interference with common path light-dividing device of the big optical path difference of the high stability, proposes a kind of its high pass
Amount, high stability relevant dispersed light spectrum imaging system, scheme are as follows：
The relevant dispersed light spectrum imaging system includes the big optical path difference interference with common path light splitting of the high stable set gradually
Device, two-way dispersion light splitting optical path and corresponding photodetector；From the big optical path difference interference with common path light splitting of the high stable
The interfering beam of device outgoing, wherein on slit after the concentrated lens of interfering beam are assembled all the way, the slit turns into color all the way
Dissipate the incident image planes position of light splitting optical path；It is described final through in light path Sagnac interferometers altogether points for another way interfering beam
The light beam that beam face returns, is setting another convergent lens and another slit in light path where the light beam, enter the light beam another
In one dispersion light splitting optical path.
Above-mentioned dispersion light splitting optical path can use prism dispersion light splitting form or grating dispersion light splitting form, wherein grating color
Dissipate the specifically chosen transmission grating of light splitting form or reflecting grating.
The advantages of of the present utility model main, is as follows：
1st, big optical path difference.The element of light path is changed by the addition middle all the way of the two-way light by light beam after interference is divided,
Such as prism or arrangement of mirrors, then big optical path difference can be produced.In this way, just realize the common light path beam-splitting structure of big optical path difference.
2nd, stability is high.It is light path technology altogether to interfere light splitting technology, with the interferometer that this is developed and relevant dispersion spectrum into
As instrument stability is high.After common light path light splitting technology, extraneous thermodynamics change acts on two arms of interferometer simultaneously, therefore
Caused optical path difference can cancel out each other, and the interference fringe of formation is also more stable, corresponding interferometer and relevant dispersion spectrum
Imager stability is high.
3rd, capacity usage ratio is high, and system sensitivity is high.The two-way interference light that interferometer can be exported in the utility model
All of avoiding in traditional coherent dispersion spectrum imager and only to utilize the situation for interfering output all the way so that utilization rate increases
It is added to close to 100%, the transmitance of whole system also greatly increases, thus improves the sensitivity of system.
Above with respect to the utility model and then the relevant dispersed light spectrum imaging system of the high flux high stable of proposition：
In fact, color dispersion-type and interference-type are two kinds of main light splitting types in spectral imaging technology.Generally will
Both light-splitting methods are used separately.Follow the trail of mesh
, can be by both when remote sensing fields survey wind speed, the speed of service of fixed star and planet is surveyed in astronomical field during target speed
Light-splitting method combines, to obtain the preferable measurement accuracy to target.In the document [1] [2], it is proposed that a kind of utilization
Relevant dispersion method (the Fixed Delay of traditional Michelson interference light splitting technology combination transmission grating light splitting technology
Interferometer), also there is the method that transmission grating therein is improved to reflecting grating light splitting technology later.However, its
In interference light splitting technology be always based on Michelson interference light splitting technology, belong to non-interference with common path light splitting technology, it is main
It is separated for also allowing for two arms of its interferometer, and light beam is advanced in two arms, according to the different then two-arm of brachium
In light path can be different, you can produce required optical path difference；But interferometer often makes because of thermodynamics deformation and environmental change
Interference fringe it is unstable, and in traditional coherent dispersion method Michelson interference light splitting only make use of in target light 50% energy
Amount, because the energy that interferometer returns to the light all the way of light source does not add utilization, this energy loss in astronomical observation is than more serious
(equivalent to the observation time for extending 4 times), cause system transmitance and sensitivity low.And the common light path (symmetrical structure) of tradition
Light splitting technology, no matter in vacuum, air or other media, route that target light is advanced wherein is to overlap and identical,
Optical path difference can not be produced.
Thus, the utility model proposes above-mentioned to be combined with dispersion light splitting technology with interference with common path light splitting technology first
Light-splitting method, it is significant.
[1]Ge J,2002a,Fixed Delay Interferometry for Doppler Extrasolar
Planet Detection.The Astrophysical Journal,571,165.
[2]Ge J,Erskine D and Rushford M,2002b,An Externally Dispersed
Interferometer for Sensitive Doppler Extrasolar Planet Searches.Publications
of the Astronomical Society of the Pacific,114:1016–1028.
Brief description of the drawings
Fig. 1 is the big optical path difference interference with common path Dichroic Optical schematic diagram of high stable of the present utility model；
Fig. 2 is to be added to be used for the schematic diagram for producing the light path adjustment structure of optical path difference in interferometer, and wherein first two is
Set up the pattern (prism or prism arrangement) of optical medium, the latter three kinds patterns (combination plane mirrow) for increase path.
Fig. 3 is a kind of relevant dispersed light spectrum imaging system of interference with common path light-dividing device shown in application drawing 1.
Drawing reference numeral explanation：
1-incident light source, 2-Sagnac interferometers, 3-prism (light path adjustment structure), 4-semi-transparent semi-reflecting beam splitter,
5-convergent lens, 6-slit, 7-lens, 8-grating, 9-photodetector.
Embodiment
Referring to Fig. 1, the big optical path difference interference with common path light-dividing device of the high stable is divided using the Sagnac of unsymmetric structure
Interferometer, the Sagnac spectral interference instrument of the unsymmetric structure, entity can be used to use split type structure, by half
Saturating half anti-beam splitter and two reflectings surface, or be made up of semi-transparent semi-reflecting beam splitter and three reflectings surface.By adjusting Sagnac
The locus of reflecting surface in interferometer, ensure light beam (returning to light source incident direction) and the incidence finally returned through beam splitter
Light beam no longer overlaps, but spatially parallel separation, consequently facilitating changing light path by changing medium or path to light beam.
Target light enters the common light path Sagnac interferometers of unsymmetric structure with parallel or converging light；Target light is done
Semi-transparent semi-reflecting beam splitter in interferometer is divided into transmitted light beam all the way and all the way the reflected beams；On transmitted light beam or the reflected beams
Light path adjustment structure is added, allows light beam by reaching beam splitter again afterwards；Return to the transmitted light beam and reflected light of beam splitter
Shu Zaici is transmitted and reflected by beam splitter, forms four road light, and wherein two-way light produces interference light and equidirectional return light source incidence
Direction, another two-way produce interference light and travel to other direction (perpendicular light source incident direction in figure).
The characteristics of each several part in device is explained in detail below：
Sagnac interferometers 2 are arranged in the light path of incident light source 1, be can access after incident light source by lens or reflector
The preset lens device of part composition, to realize the effects such as the collimation to incident light, the veiling glare that disappears.Sagnac interferometers 2 are included by three
Individual reflecting surface and a semi-transparent semi-reflecting beam-splitting surface, the hollow form that can be made up of speculum and semi-transparent semi-reflecting beam splitter 4,
The solid form that reflectance coating and semi-transparent semi-reflecting beam splitting coating 4 form can be plated by prism.In design, must be unsymmetric structure,
That is three reflectings surface of interferometer are not in relation to beam-splitting surface axial symmetry, but one of face or two faces even three faces are each self-produced
Raw certain translation, translational movement depend on the diameter of light beam and required physical space size.No matter translational movement how much, interferometer
Two-way outgoing interfering beam return to light source direction all the way, and no longer overlapped with former incident beam；Another way is perpendicular to incident light
Source direction.
Being added to interferometer, wherein the prism 3 of light is used to change light path all the way, and it can be added to incident light source for the first time
By that in the transmitted light beam after semi-transparent semi-reflecting beam splitter 4, can also be added to for the first time by anti-after semi-transparent semi-reflecting beam splitter 4
In irradiating light beam, but must be before they are again by semi-transparent semi-reflecting beam splitter 4.
As shown in Figure 2, the forms such as arrangement of mirrors can also be changed to for changing the prism 3 of light path.
Interferometer shown in figure is hollow-core construction, and semi-transparent semi-reflecting beam splitter 4 can be the beam splitter of cubic form
It can be the beam splitter of flat type, if interferometer is solid construction, semi-transparent half can be plated by the prism for forming interferometer
Anti- beam splitting coating is realized.
Using the device, a kind of relevant dispersion spectrum imaging device of high flux high stable can be set up, as shown in figure 3, will
Two-way interference fringe assemble respectively after to imaging slit on, slit turn into subsequent optical path in Dispersive Devices incident image planes position.
Two-way interference light is entered in subsequent optical path so that capacity usage ratio reaches highest close to 100%, improves system to greatest extent
Light transmittance.Subsequent optical path can use grating dispersion light splitting form, and Dispersive Devices are transmission grating or reflecting grating, will be interfered
Striped in wavelength dispersion to photodetector according to receiving.The interference fringe by Wavelength distribution after reception by noise reduction filtering, put
After the processing such as big, the software processing on hardware chip or computer, extraction obtains the information of interference fringe.Interfered by handling
Intensity, the phase place change of striped, are finally inversed by the information such as the speed of service of target light.
The effect of convergent lens 5 is that the interference fringe convergence for forming interference light is imaged onto at slit 6.The effect of slit 6
It is the entrance slit as follow-up Dispersive Devices, and at an image planes of follow-up dispersion beam splitting system, it is spuious also functions to elimination
The effect of light.The effect of lens 7 is that the light at slit is organized into directional light, is incided in follow-up Dispersive Devices grating.Thoroughly
Mirror 7 can also be substituted (corresponding, subsequent optical device is placed on the reflected light path of speculum group) with arrangement of mirrors.The reality
Example is applied using grating dispersion light splitting form, the effect of grating 8 be the interference fringe for forming interfering beam according to wavelength dispersion, and
It is imaged onto on photodetector 9.Grating 8 can be transmission grating or reflecting grating.
The effect of photodetector 9 is will to carry out sample collection according to the interferometric fringe signal of Wavelength distribution, and is converted to
Electric signal, and signal the processing such as be amplified to, filtered, to realize that the hardware of the relevant parameters such as the speed of target light, temperature is anti-
Drill or computer software inverting provides measurement data.Photodetector can be CCD or other optical-electrical converters
Part.
Claims (10)
- A kind of 1. big optical path difference interference with common path light-dividing device of high stable, using common light path Sagnac interferometers, it is characterised in that： The light path Sagnac interferometers altogether are unsymmetric structure, i.e., the space bit of the reflecting surface in light path Sagnac interferometers installs altogether Put and the final light beam returned through beam-splitting surface in light path Sagnac interferometers altogether is no longer overlapped with incident beam, but in space Upper parallel separation；Beam kept man of a noblewoman time light splitting of scoring obtains one-level light beam, and secondary light splitting obtains two level light beam；Then in the light path before secondary light splitting Light path adjustment structure is additionally provided with corresponding to the light beam of spaced parallel separation so that two-way one-level light beam finally produces light path Difference, it is emitted with interfering beam.
- 2. the big optical path difference interference with common path light-dividing device of high stable according to claim 1, it is characterised in that：The light path Adjustment structure, it is to set up different optical mediums, or increases path to change light path.
- 3. the big optical path difference interference with common path light-dividing device of high stable according to claim 2, it is characterised in that：The light path Adjustment structure, it is arranged on the transmitted light path after light splitting first, or is arranged on the reflected light path after light splitting first.
- 4. the big optical path difference interference with common path light-dividing device of high stable according to claim 2, it is characterised in that：The optics Medium is prism, and the increase path is realized using arrangement of mirrors.
- 5. the big optical path difference interference with common path light-dividing device of high stable according to claim 1, it is characterised in that：In incident light Between source and the interference with common path light splitting optical path, preposition optical shaping system is additionally provided with, mainly by lens and/or reflector Part forms.
- 6. the big optical path difference interference with common path light-dividing device of high stable according to claim 1, it is characterised in that：The beam splitting Face is semi-transparent semi-reflective.
- 7. the big optical path difference interference with common path light-dividing device of high stable according to claim 6, it is characterised in that：Light path altogether The beam-splitting structure of Sagnac interferometers, the hollow form being made up of speculum and semi-transparent semi-reflecting beam splitter, or by prism The solid form of reflectance coating and semi-transparent semi-reflecting beam splitting coating composition is correspondingly plated in different faces.
- 8. the big optical path difference interference with common path light-dividing device of high stable according to any one of claims 1 to 7, it is characterised in that： The light path Sagnac interferometers altogether are pentagonal prism type or three reflector types.
- 9. a kind of relevant dispersion spectrum using the big optical path difference interference with common path light-dividing device of high stable described in claim 1 is imaged System, it is characterised in that：The big optical path difference interference with common path light-dividing device of the high stable, two-way dispersion including setting gradually point Light light path and corresponding photodetector；From the interference light of the big optical path difference interference with common path light-dividing device outgoing of the high stable Beam, wherein on slit after the concentrated lens of interfering beam are assembled all the way, the slit turns into the incidence of dispersion light splitting optical path all the way Image planes position；It is the final light beam returned through beam-splitting surface in light path Sagnac interferometers altogether for another way interfering beam, Another convergent lens and another slit are being set where the light beam in light path, the light beam is entered another dispersion light splitting optical path In.
- 10. relevant dispersed light spectrum imaging system according to claim 9, it is characterised in that：The dispersion light splitting optical path is adopted Be divided form or grating dispersion light splitting form with prism dispersion, wherein the grating dispersion specifically chosen transmission grating of light splitting form or Reflecting grating.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918392A (en) * | 2017-03-10 | 2017-07-04 | 中国科学院西安光学精密机械研究所 | A kind of big optical path difference interference with common path light-dividing device of high stable and its application system |
| CN111578832A (en) * | 2020-04-30 | 2020-08-25 | 南京理工大学 | Short coherent light source interferometer-based long-stroke optical path matching device and experimental method |
-
2017
- 2017-03-10 CN CN201720230637.9U patent/CN206905905U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918392A (en) * | 2017-03-10 | 2017-07-04 | 中国科学院西安光学精密机械研究所 | A kind of big optical path difference interference with common path light-dividing device of high stable and its application system |
| CN106918392B (en) * | 2017-03-10 | 2019-01-22 | 中国科学院西安光学精密机械研究所 | A kind of big optical path difference interference with common path light-dividing device of high stable and its application system |
| CN111578832A (en) * | 2020-04-30 | 2020-08-25 | 南京理工大学 | Short coherent light source interferometer-based long-stroke optical path matching device and experimental method |
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