CN105509902B - The interferometric method and system of vortex light - Google Patents
The interferometric method and system of vortex light Download PDFInfo
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- CN105509902B CN105509902B CN201511000590.9A CN201511000590A CN105509902B CN 105509902 B CN105509902 B CN 105509902B CN 201511000590 A CN201511000590 A CN 201511000590A CN 105509902 B CN105509902 B CN 105509902B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
- G01J9/02—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength by interferometric methods
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Abstract
The invention discloses the interferometric method of vortex light and systems, including：Vortex light generates unit, control unit, vortex light-modulating cell, conjugation vortex optical interference unit and image acquisition units.Vortex light generates unit for generating vortex beams；Control unit for changing vortex light propagation light path；Vortex light-modulating cell is for being modulated the topological charge of vortex beams；Conjugation vortex optical interference unit is used to a branch of vortex light being divided into two beams, and converts wherein a branch of vortex light to the conjugation vortex light of another beam, then interferes two-beam；The interference strength figure that image acquisition units are used to be conjugated two beams vortex light is acquired, by being analyzed gathered data exponent number and symbol it is hereby achieved that vortex light topological charge.The present invention proposes a kind of simple integer and half-integer topological charge interferometer measuration system that interference effect is introduced without device using improved M-Z interferometers with the square loop device for carrying vortex phase plate VPP.
Description
Technical field
The present invention relates to free-space communications and quantum communication network field, and in particular to the interferometric method of vortex light
With system.
Background technology
1992, the Allen team of Univ Leiden Netherlands theoretically proved in photon containing determining orbital angular momentum
(Orbital Angular Momentum,OAM)One photon OAM value isCorresponding spiral shape equiphase surface, spiral phase
Position item is exp (il φ), and l is OAM topological charges, and the sign symbol of l represents direction of rotation difference, and φ is the pole in polar coordinate system
Angle.Vortex light with OAM is in quantum information processing, Atomic Manipulation, microoperation and the fields such as life science and remote sensing
With potential application.Therefore, accurate measure is carried out to the topological charge of vortex light to have very important significance.
Measurement to vortex light topological charge includes the measurement to its exponent number and symbol.Carry the Q-RING of vortex phase plate
Road device can be modulated the topological charge of vortex light.If vortex light after odd number secondary reflection, vortex light topological charge
Symbol will change.Recent years for simplicity generally measures the topological charge of vortex light using diffraction method.
2009, vortex light passed through the diffraction of looping pit, by the maximum integer that can measure the analysis of diffracted intensity figure vortex light
Topological charge exponent number is 9.2013, for vortex light by the diffraction of inclination convex lens, vortex light can be obtained by analyzing diffracted intensity figure
Maximum integer topological charge exponent number be 14.2015, by analyzing the interference pattern of vortex light and its conjugate beam, people, which measure, to be vortexed
The maximum integer topological charge exponent number of light can reach 60.Recently, by a modified M-Z interferometer, the maximum of vortex light can
It measures integer topological charge exponent number and has reached 90.However, these measurement methods can only obtain the exponent number of topological charge, the symbol of topological charge
It has no idea to measure, then has since system includes the device as dove prism, there are the interference that device introduces to system
And some are complicated.
Invention content
It is an object of the invention to for the deficiency more than solving, provide the interferometric method and system of vortex light,
The system can measure the exponent number and symbol of vortex finishing number and half-integer topological charge, and system structure is simple and is introduced without device
The influence of interference.
The technical proposal of the invention is realized in this way：The interferometer measuration system of vortex light, including vortex light generation unit,
Control unit, vortex light-modulating cell, conjugation vortex optical interference unit and image acquisition units, wherein：
The vortex light generates unit for generating vortex beams comprising pump light source LD, optical beam expander BE, computer
The spatial light modulator SLM of control and the first total reflection mirror M1；
Described control unit is for changing the propagation light path of vortex light, and when controlling home position signal, vortex beams are reflected
Transmission；When controlling signal reset, vortex beams are transmitted transmission；
The vortex light-modulating cell is for being modulated the topological charge of vortex beams comprising the second total reflection mirror
M2, third total reflection mirror M3, the 4th total reflection mirror M4, the first lens L1, the second lens L2 and vortex phase plate VPP；
The conjugation vortex optical interference unit is used to a branch of vortex light being divided into two beam vortex light, and will wherein a branch of vortex
Light is converted into the conjugation vortex light of another beam, then interferes two-beam comprising the first beam splitter BS1, the second beam splitting
Device BS2, the 5th total reflection mirror M5, the 6th total reflection mirror M6, the 7th total reflection mirror M7, the total reflections of eight convergent points speculum M8 and the 9th
Mirror M9；
The interference strength figure that described image collecting unit is used to be conjugated two beams vortex light is acquired, by strong to interfering
Degree figure is analyzed, and is compared to the computer-controlled charge coupled device CCD interference strength figures acquired twice, so as to
To obtain the integer and half-integer topological charge of vortex light, wherein topological charge includes that (topological charge expression is closed around light beam for exponent number and symbol
One contour integration of cyclization road is the number of 2 π integral multiples) comprising the third lens L3 and computer-controlled charge coupled device
CCD；
The pump light source LD generates laser pulse, and laser pulse is irradiated to institute after optical beam expander BE is focused and expanded
Vortex light is stated on computer-controlled spatial light modulator SLM and generates, the vortex light changes through the first total reflection mirror M1 to be propagated
Side is back into described control unit；
When the control home position signal of described control unit, vortex light is after the first total reflection mirror M1 and control unit reflection
Vortex light is divided into two beams by the first beam splitter BS1, the first beam splitter BS1 into conjugation vortex optical interference unit, wherein
A branch of vortex light passes through the first beam splitter BS1, the 7th total reflection mirror M7, eight convergent points speculum M8 and the 9th total reflection mirror M9 successively
Reflection after reach the second beam splitter BS2；Another beam vortex light successively pass through the 5th total reflection mirror M5, the 6th total reflection mirror M6 and
Symbol becomes on the contrary, keep up with a branch of vortex light the second beam splitter BS2 of arrival simultaneously, and here after second beam splitter BS2 reflection
It interferes, the interference light enters image acquisition units, is generated according to interference strength figure in described image collecting unit
The counting of petal (the interference strength figure of interference light is made of multiple similar petal shapes) obtains the integer and half-integer of vortex light
The exponent number of topological charge；
When control unit control signal reset when, transmitted through control unit vortex beams through the second total reflection mirror M2 with
The first lens L1 that the vortex light-modulating cell is entered after the M3 reflections of third total reflection mirror, by the first lens L1 to being vortexed
Vortex light after light size is controlled changes light path using the 4th total reflection mirror M4, changes the vortex light of light path by being vortexed
Phase-plate VPP, topological charge increase by 1 rank, are then controlled vortex light size through the second lens L2, last again single through control
Member is transmitted into conjugation vortex optical interference unit, and then light path repeats the above-mentioned light path road for entering conjugation vortex optical interference unit
Line.
Preferably, described control unit is made of grating crystal switch GCCD.
Preferably, the vortex phase plate VPP is the fixed transparent phase plate of one piece of refractive index.
Preferably, one side surface of transparent phase plate is plane, and another side surface is helical phase face, thickness and angle
It is directly proportional to azimuth.
Preferably, the first beam splitter BS1 is used to a branch of vortex light being divided into two beams, splitting ratio 50：50.
Preferably, the second beam splitter BS2 is used to two beams being conjugated the vortex interference of light and synthesizes a branch of, and splitting ratio is
50：50.
Preferably, the interfering beam that the second beam splitter BS2 comes out from conjugation vortex optical interference unit is through the third lens L3
Into after image acquisition units, the interfering beam enters electricity after the third lens L3 controls vortex light size
The charge coupled device CCD, the computer-controlled charge coupled device CCD of brain control carry out the interference strength figure of interference light
Acquisition, analyzes interference strength figure, and the half of the petal number of interference strength figure is the topological charge of vortex light, to basis
The counting of petal obtains the exponent number of the integer and half-integer topological charge of vortex light.
Preferably, it is compared by the interference strength figure acquired twice to computer-controlled charge coupled device CCD, if
The petal number of interference strength figure increases by 2, then the topological charge symbol for the light that is vortexed be otherwise be negative just.
A kind of interferometric method of vortex light, the interferometer measuration system of above-mentioned vortex light, this method include following step
Suddenly：
S1. the generation of vortex light：The pump light source LD generates laser pulse, and laser pulse is poly- through optical beam expander BE
It is burnt and irradiate computer-controlled spatial light modulator SLM after expanding, whirlpool can be generated by computer-controlled spatial light modulator SLM
Optically-active enters control unit after the first total reflection mirror M1 changes light path；
S2. the change of vortex light light path：When the control home position signal of control unit, grating of the vortex beams in control unit
Conjugation vortex optical interference unit is reflected at crystal switch GCCD；When controlling signal reset, vortex beams are in control unit
It is transmitted into vortex light-modulating cell at grating crystal switch GCCD；
S3. the modulation of vortex light：When the control signal of control unit resets, vortex beams, which enter, carries vortex phase plate
The square loop device of VPP, after a vortex phase plate VPP, the topological charge of vortex light will increase by 1 rank, then through grating
Crystal switch GCCD is transmitted into conjugation vortex optical interference unit；
S4. the interference of vortex light：The vortex beams that grating crystal switch GCCD comes out are divided into two after the first beam splitter BS1
Beam, wherein a branch of conjugation vortex light that another beam is converted into after the odd number secondary reflection of total reflection mirror in light path, and two beams are total
Yoke vortex light interferes at the second beam splitter BS2, and interference light enters image acquisition units through the third lens L3；
S5. the acquisition of image：It is conjugated the interference light that vortex optical interference unit comes out and controls light collar vortex through the third lens L3
Enter computer-controlled charge coupled device CCD after size, the intensity distribution of interference light is acquired, by interference
Intensity map is analyzed, and is compared to the computer-controlled charge coupled device CCD interference strength figures acquired twice, to
The integer and half-integer topological charge of vortex light can be obtained, wherein topological charge includes exponent number and symbol.
Beneficial effects of the present invention：The interferometer measuration system of the present invention can measure the integer and half-integer topology of vortex light
Lotus；It ensure that the accurate equiarm characteristic of M-Z interferometers using simple total reflection mirror；Odd-times using simple total reflection mirror is anti-
It penetrates and converts a branch of vortex light to its conjugation vortex light, from the influence for introducing interference without device；Global design Rational structure
Simply, use is easy to operate, can not only measure the exponent number of topological charge, but also can obtain the symbol of topological charge.
Description of the drawings
Fig. 1 is a kind of block schematic illustration of the interferometer measuration system of vortex light of the present invention.
Fig. 2 is a kind of flow diagram of the interferometric method of vortex light of the present invention.
Fig. 3 is a kind of measurement result (the petal counting in interference strength figure of the interferometer measuration system of vortex light of the present invention
For 4).
Fig. 4 is a kind of measurement result (the petal counting in interference strength figure of the interferometer measuration system of vortex light of the present invention
For 6).
Fig. 5 is a kind of measurement result (the petal counting in interference strength figure of the interferometer measuration system of vortex light of the present invention
For 7).
Fig. 6 is a kind of measurement result (the petal counting in interference strength figure of the interferometer measuration system of vortex light of the present invention
For 5).
In figure, the corresponding title of each label：10- vortex light generates unit：101- pump light sources LD, 102- optical beam expander
The computer-controlled spatial light modulator SLM of BE, 103-, the first total reflection mirrors of 104- M1；20- control units；30- vortex light modulations
Unit, first the 4th total reflection mirror M4 of lens L1,304- of 301- the second total reflection mirror M2,302- third total reflection mirrors M3,303-,
The second lens L2 of 305- vortex phase plates VPP, 306-；40- is conjugated vortex optical interference unit：The first beam splitters of 401- BS1,402-
5th total reflection mirror M5,403- the second beam splitter of the 6th total reflection mirror M6,404- BS2,405- the 7th total reflection mirror M7,406-
The 9th total reflection mirror M9 of eight convergent points speculum M8,407-；50- image acquisition units：501- the third lens L3,502- is computer-controlled
Charge coupled device CCD.
Specific implementation mode
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings
The specific implementation mode of the present invention is described further below in conjunction with attached drawing 1-6：
With reference to shown in attached drawing 1, a kind of interferometer measuration system of vortex light, the system includes that vortex light generates unit 10, control
Unit 20, vortex light-modulating cell 30, conjugation vortex optical interference unit 40 and image acquisition units 50 processed.
The wherein described vortex light generates unit 10 for generating vortex beams comprising pump light source LD101, beam spread
Device BE102, computer-controlled spatial light modulator SLM103 and the first total reflection mirror M1 104；Described control unit 20 is by grating
Crystal switch GCCD is constituted, and for changing the propagation light path of vortex light, when controlling home position signal, vortex beams are passed by reflection
It is defeated；When controlling signal reset, vortex beams are transmitted transmission；The vortex light-modulating cell 30 is for opening up vortex beams
It flutters lotus to be modulated comprising the second total reflection mirror M2 301, third total reflection mirror M3 302, the first lens L1 the 303, the 4th
Total reflection mirror M4 304, vortex phase plate VPP305 and the second lens L2 306；The conjugation vortex optical interference unit 40 is used for
A branch of vortex light is divided into two beam vortex light, and converts wherein a branch of vortex light to the conjugation vortex light of another beam, it is then right
Two-beam is interfered comprising the first beam splitter BS1 401, the 5th total reflection mirror M5 402, the 6th total reflection mirror M6 403,
Second beam splitter BS2 404, the 7th total reflection mirror M7 405, eight convergent points speculum M8 406 and the 9th total reflection mirror M9 407；
Described image collecting unit 50 be used for two beams be conjugated vortex light interference strength figure be acquired, by interference strength figure into
Row analysis (analysis here is exactly intuitively to be checked to the petal counting in interference strength figure by human eye), and to computer
The interference strength figure that the charge coupled device CCD502 of control is acquired twice is compared, it is hereby achieved that the integer of vortex light
With half-integer topological charge (topological charge is indicated around the number that one contour integration of light beam closed loop is 2 π integral multiples), wherein topological charge
Including exponent number and symbol；Described image collecting unit 50 includes the third lens L3 501 and computer-controlled charge coupled device
CCD502。
The function and mutual connection relation of wherein each element are as follows：
The pump light source LD101 is for generating laser pulse；The optical beam expander BE102 and the pump light source
LD101 connections, for being focused and expanding to laser pulse；The computer-controlled spatial light modulator SLM103 with it is described
Optical beam expander BE102 connections, for generating vortex beams；The first total reflection mirror M1 104 and the computer-controlled sky
Between optical modulator SLM103 connections, for changing the direction of propagation of vortex beams.
The second total reflection mirror M2 301 is connect with described control unit 20, for changing the propagation side of vortex beams
To；The third total reflection mirror M3 302 is connect with the second total reflection mirror M2 301, for changing the propagation of vortex beams
Direction；The first lens L1 303 is connect with the third total reflection mirror M3 302, the size for controlling vortex light；It is described
4th total reflection mirror M4 304 is connect with the first lens L1 303, for changing the direction of propagation of vortex beams；The whirlpool
Rotation phase-plate VPP305 is connect with the 4th total reflection mirror M4 304, for that will be increased by the topological charge of its vortex beams
1 rank；The second lens L2 306 is connect with the vortex phase plate VPP305, the size for controlling vortex light, and by whirlpool
Optically-active beam is transferred to control unit 20.
The first beam splitter BS1 401 is connect with described control unit 20, splitting ratio 50：50, being used for will be a branch of
Vortex light is divided into two beams；The 5th total reflection mirror M5 402, the 6th total reflection mirror M6 403, the 7th total reflection mirror M7 405,
Eight convergent points speculum M8 406 and the 9th total reflection mirror M9 407 and ensures that M-Z is dry for changing the direction of propagation of vortex beams
The accurate equiarm characteristic of interferometer；The second beam splitter BS2 404 and the 6th total reflection mirror M6 403 and the 9th total reflection mirror M9
407 connections, splitting ratio 50：50, for interfering and synthesizing a branch of two beams conjugation vortex light herein；Described first point
Beam device BS1 401, the 7th total reflection mirror M7 405, eight convergent points speculum M8 406 and the 9th total reflection mirror M9 407 are to wherein one
Beam vortex light reflection four times, vortex beams symbol is constant；The 5th total reflection mirror M5 402,403 and of the 6th total reflection mirror M6
Three times to another beam vortex light reflection, which changes second beam splitter BS2 404.
The third lens L3 501 connects with the second beam splitter BS2 404 in the conjugation vortex optical interference unit 40
It connects, the size for controlling vortex beams；The computer-controlled charge coupled device CCD502 and the third lens L3
501 connections, the interference strength figure for two beams to be conjugated with vortex light is acquired, by analyzing interference strength figure, and
The computer-controlled charge coupled device CCD502 interference strength figures acquired twice are compared, it is hereby achieved that vortex light
Integer and half-integer topological charge, wherein topological charge includes exponent number and symbol.
The concrete operating principle of the present invention is as follows：Pump light source LD101, which is generated, in the interferometer measuration system of the vortex light swashs
Light pulse, laser pulse irradiate computer-controlled spatial light modulator SLM103 after optical beam expander BE102 is focused and expanded,
Vortex light can be generated by computer-controlled spatial light modulator SLM103, vortex light changes through the first total reflection mirror M1 104 to be passed
The side of broadcasting is back into grating crystal switch GCCD20.
When the control home position signal of control unit 20, vortex light is through the first total reflection mirror M1 104 and grating crystal switch
Enter the first beam splitter BS1 401 of conjugation vortex optical interference unit 40 after GCCD20 reflections, the first beam splitter BS1 401 is by whirlpool
Optically-active is divided into two beams, wherein a branch of vortex light is anti-by the first beam splitter BS1 401, the 7th total reflection mirror M7 405, eight convergent points
The second beam splitter BS2 404 is reached after penetrating the reflection of mirror M8 406 and the 9th total reflection mirror M9 407, and symbol is constant；Another beam
Vortex light symbol after the 5th total reflection mirror M5 402, the 6th total reflection mirror M6 403 and the second beam splitter BS2 404 reflection
Become on the contrary, keep up with a branch of vortex light while reaching the second beam splitter BS2 404, and interfere here, interference light enters
Image acquisition units 50.
The interference light that second beam splitter BS2 404 comes out from conjugation vortex optical interference unit 40 is through the third lens L3 501
Into image acquisition units 50, interference light enters computer-controlled after the third lens L3 501 controls vortex light size
Charge coupled device CCD502, computer-controlled charge coupled device CCD502 are acquired the interference strength figure of interference light,
By analyzing interference strength figure, the half of the petal number of interference strength figure is the topological charge of vortex light, to basis
The counting of petal is obtained with the exponent number of the integer and half-integer topological charge of vortex light.
When the control signal of control unit 20 resets, the vortex light transmitted through grating crystal switch GCCD20 is complete through second
Speculum M2301 enters vortex light-modulating cell 30, and vortex light is through the second total reflection mirror M2 301 and third total reflection mirror M3
Enter the first lens L1 303, the vortex light after the first lens L1 303 controls vortex light size after 302 reflections
Change light path using the 4th total reflection mirror M4 304, the vortex light for changing light path passes through vortex phase plate VPP305, topology
Lotus increases by 1 rank, is then controlled vortex light size through the second lens L2 306, most saturating through grating crystal switch GCCD20 afterwards
It injects into conjugation vortex optical interference unit 40, subsequent process is with the above-mentioned process weight for entering conjugation vortex optical interference unit 40
Multiple, in order to simple, I will not elaborate.At this point, the interference acquired twice to computer-controlled charge coupled device CCD502 is strong
Degree figure is compared, if the petal number of interference strength figure increases by 2, the topological charge symbol of the light that is vortexed be otherwise be negative just.
With reference to shown in attached drawing 2, based on the interferometric method of above-mentioned vortex light, include a kind of interference of above-mentioned vortex light
Measuring system, this method include the following steps：
S1. the generation of vortex light：Pump light source LD generates laser pulse, focusing of the laser pulse through optical beam expander BE and
Computer-controlled spatial light modulator SLM is irradiated after expanding, and vortex can be generated by computer-controlled spatial light modulator SLM
Light enters grating crystal switch GCCD after the first total reflection mirror M1 changes light path.
S2. the change of vortex light light path：When the control home position signal of control unit, vortex light is in grating crystal switch GCCD
Place is reflected into conjugation vortex optical interference unit；Control signal reset when, vortex light transmitted at grating crystal switch GCCD into
Enter the light-modulating cell that is vortexed.
S3. the modulation of vortex light：When the control signal of control unit resets, vortex light, which enters, carries vortex phase plate
The square loop device of VPP, after a vortex phase plate VPP, the topological charge of vortex light will increase by 1 rank, then through grating
Crystal switch GCCD is transmitted into conjugation vortex optical interference unit.
S4. the interference of vortex light：The vortex light that grating crystal switch GCCD comes out is divided into two after the first beam splitter BS1
Beam, wherein a branch of conjugation vortex light that another beam is converted into after the odd number secondary reflection of total reflection mirror in light path, and two beams are total
Yoke vortex light interferes at the second beam splitter BS2, and interference light enters image acquisition units through the third lens L3.
S5. the acquisition of image：It is conjugated the interference light that vortex optical interference unit comes out and controls light collar vortex through the third lens L3
Enter computer-controlled charge coupled device CCD after size, the intensity distribution of interference light is acquired, by interference
Intensity map is analyzed, and is compared to the computer-controlled charge coupled device CCD interference strength figures acquired twice, to
The integer and half-integer topological charge of vortex light can be obtained, wherein topological charge includes exponent number and symbol.
With reference to shown in attached drawing 3- Fig. 6, the measurement process of the present embodiment is further illustrated, computer-controlled Charged Couple dress
CCD interference strength figures shown above are set to be made of multiple similar petal shapes.It is 2 between petal number n and topological charge number l
Times relationship, i.e. n=2l, to can directly calculate topological charge number by petal number.
The present invention proposes a kind of interferometer measuration system of vortex finishing number and half-integer topological charge, which not only can be with
The symbol of vortex finishing number and half-integer topological charge is measured, and the rank of vortex finishing number and half-integer topological charge can be measured
The exponent number of number, maximum integer topological charge can reach 90, and system structure is simple and the influence of interference is introduced without device.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is changed.Therefore, the invention is not limited in specific implementation modes disclosed and described above, to the present invention's
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (9)
1. the interferometer measuration system of vortex light, which is characterized in that generate unit, control unit, vortex light modulation including vortex light
Unit, conjugation vortex optical interference unit and image acquisition units, wherein：
The vortex light generates unit for generating vortex beams；It includes pump light source LD, light beam that the vortex light, which generates unit,
Expander BE, computer-controlled spatial light modulator SLM and the first total reflection mirror M1；
Described control unit is for changing the propagation light path of vortex beams, and when controlling home position signal, vortex beams are passed by reflection
It is defeated；When controlling signal reset, vortex beams are transmitted transmission；
The vortex light-modulating cell is for being modulated the topological charge of vortex beams；The vortex light-modulating cell includes the
Two total reflection mirror M2, third total reflection mirror M3, the 4th total reflection mirror M4, the first lens L1, the second lens L2 and vortex phase plate
VPP；
The second total reflection mirror M2 is connect with described control unit, for changing the direction of propagation of vortex beams；The third
Total reflection mirror M3 is connect with the second total reflection mirror M2, for changing the direction of propagation of vortex beams；The first lens L1
It is connect with the third total reflection mirror M3, the size for controlling vortex light；The 4th total reflection mirror M4 is saturating with described first
Mirror L1 connections, for changing the direction of propagation of vortex beams；The vortex phase plate VPP and the 4th total reflection mirror M4 connects
It connects, for that will increase by 1 rank by the topological charge of its vortex beams；The second lens L2 and vortex phase plate VPP connects
It connects, the size for controlling vortex light, and vortex beams is transferred to control unit；
The conjugation vortex optical interference unit is used to a branch of vortex light being divided into two beam vortex light, and wherein a branch of vortex light is turned
The conjugation vortex light for turning to another beam, then interferes two-beam；The conjugation vortex optical interference unit includes first point
Beam device BS1, the second beam splitter BS2, the 5th total reflection mirror M5, the 6th total reflection mirror M6, the 7th total reflection mirror M7, eight convergent points reflection
Mirror M8 and the 9th total reflection mirror M9；
The interference strength figure that described image collecting unit is used to be conjugated two beams vortex light is acquired, and to computer-controlled electricity
The interference strength figure that lotus coupling device CCD is acquired twice is compared, to obtain the integer and half-integer topological charge of vortex light,
Wherein topological charge includes exponent number and symbol；Described image collecting unit includes the third lens L3 and computer-controlled Charged Couple dress
Set CCD；
The pump light source LD generates laser pulse, and laser pulse is irradiated to the electricity after optical beam expander BE is focused and expanded
On the spatial light modulator SLM of brain control and vortex beams are generated, the vortex beams change through the first total reflection mirror M1 to be propagated
Side is back into described control unit；
When the control home position signal of described control unit, vortex light enters after the first total reflection mirror M1 and control unit reflection
It is conjugated the first beam splitter BS1 of vortex optical interference unit, vortex beams are divided into two beams by the first beam splitter BS1, wherein one
Beam vortex light passes through the first beam splitter BS1, the 7th total reflection mirror M7, eight convergent points speculum M8 and the 9th total reflection mirror M9 successively
The second beam splitter BS2 is reached after reflection；Another beam vortex light passes through the 5th total reflection mirror M5, the 6th total reflection mirror M6 and the successively
Symbol becomes on the contrary, keep up with a branch of vortex light while reaching the second beam splitter BS2, and send out here after two beam splitter BS2 reflections
Raw interference, interference light enter image acquisition units, the petal shape constituted according to interference strength in described image collecting unit
The counting of petal is obtained with the exponent number of the integer and half-integer topological charge of vortex light in interference strength figure；
When the control signal of control unit resets, the interference strength figure for comparing acquisition can measure the symbol of topological charge, transmitted through
The vortex beams of control unit enter the vortex light modulation after the second total reflection mirror M2 and the M3 reflections of third total reflection mirror
First lens L1 of unit, the vortex light after the first lens L1 controls vortex light size is using the 4th total reflection
Mirror M4 changes light path, and the vortex light for changing light path passes through vortex phase plate VPP, and topological charge increases by 1 rank, then through the second lens
L2 controls vortex light size, last to be transmitted into conjugation vortex optical interference unit through control unit again, then light path weight
The multiple above-mentioned light path route for entering conjugation vortex optical interference unit.
2. the interferometer measuration system of vortex light as described in claim 1, which is characterized in that described control unit is by grating crystal
Switch GCCD is constituted.
3. the interferometer measuration system of vortex light as described in claim 1, which is characterized in that the vortex phase plate VPP is one
The fixed transparent phase plate of block refractive index.
4. the interferometer measuration system of vortex light as claimed in claim 3, which is characterized in that one side surface of transparent phase plate
For plane, another side surface is helical phase face, and thickness is directly proportional to angular azimuth.
5. the interferometer measuration system of vortex light as described in claim 1, which is characterized in that the first beam splitter BS1 is used for
A branch of vortex light is divided into two beams, splitting ratio 50：50.
6. the interferometer measuration system of vortex light as described in claim 1, which is characterized in that the second beam splitter BS2 is used for
Two beams conjugation vortex beams are interfered and synthesize a branch of, splitting ratio 50：50.
7. the interferometer measuration system of vortex light as described in claim 1, which is characterized in that from conjugation vortex optical interference unit
The interference light that second beam splitter BS2 comes out is after the third lens L3 enters image acquisition units, and the interference light is by described the
Three lens L3 enter computer-controlled charge coupled device CCD, the computer-controlled electricity after controlling vortex light size
Lotus coupling device CCD is acquired the interference strength figure of interference light, and analyzes interference strength figure, in interference strength figure
The half of petal is the topological charge of vortex light, and the integer and half-integer topological charge of vortex light are then obtained according to the counting of petal
Exponent number.
8. the interferometer measuration system of vortex light as claimed in claim 7, which is characterized in that by computer-controlled charge coupling
It attaches together and sets the interference strength figure that CCD is acquired twice and compared, if the petal number of interference intensity map increases by 2, be vortexed light
Topological charge symbol be just, be otherwise negative.
9. a kind of interferometric method of vortex light includes the interferometry system of the vortex light as described in claim 1-8 is any
System, which is characterized in that this method includes the following steps：
S1. the generation of vortex light：The pump light source LD generates laser pulse, focusing of the laser pulse through optical beam expander BE and
Computer-controlled spatial light modulator SLM is irradiated after expanding, and vortex can be generated by computer-controlled spatial light modulator SLM
Light enters control unit after the first total reflection mirror M1 changes light path；
S2. the change of vortex light light path：When the control home position signal of control unit, vortex light is opened in the grating crystal of control unit
It closes and is reflected into conjugation vortex optical interference unit at GCCD；When controlling signal reset, grating crystal of the vortex light in control unit
Vortex light-modulating cell is transmitted at switch GCCD；
S3. the modulation of vortex light：When the control signal of control unit resets, vortex light, which enters, carries vortex phase plate VPP's
Square loop device, after a vortex phase plate VPP, the topological charge of vortex light will increase by 1 rank, then be opened through grating crystal
It closes GCCD and is transmitted into conjugation vortex optical interference unit；
S4. the interference of vortex light：The vortex light that grating crystal switch GCCD comes out is divided into two beams after the first beam splitter BS1,
In a branch of conjugation vortex light that another beam is converted into after the odd number secondary reflection of total reflection mirror in light path, and two beams conjugation be vortexed
Light interferes at the second beam splitter BS2, and interference light enters image acquisition units through the third lens L3；
S5. the acquisition of image：It is conjugated the size that the interference light that vortex optical interference unit comes out controls light collar vortex through the third lens L3
Enter computer-controlled charge coupled device CCD afterwards, the intensity distribution of interference light is acquired, by interference strength
Figure is analyzed, and is compared to the computer-controlled charge coupled device CCD interference strength figures acquired twice, so as to
The integer and half-integer topological charge of vortex light are obtained, wherein topological charge includes exponent number and symbol.
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| CN114088527B (en) * | 2021-11-24 | 2023-09-08 | 东南大学成贤学院 | Device and method for detecting elastic modulus of material |
| CN114674247B (en) * | 2022-03-04 | 2024-03-15 | 中国人民解放军战略支援部队航天工程大学 | Target azimuth angle measurement method based on vortex beam OAM phase spectrum |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940520A (en) * | 2014-04-10 | 2014-07-23 | 昆明理工大学 | Device and method for detecting topological charge number of vortex beams based on improved Mach-Zehnder interferometer |
| CN104121996A (en) * | 2014-07-21 | 2014-10-29 | 河南科技大学 | Measuring device for measuring vortex light beam high-order topological charge |
| CN104280141A (en) * | 2014-10-20 | 2015-01-14 | 西北工业大学 | Beam splitter prism and method and device for detecting topological charge of vortex beam |
| CN105115607A (en) * | 2015-08-10 | 2015-12-02 | 河南科技大学 | Apparatus of using cross double slit interference to measure vortex light beam topology load value and method thereof |
| CN205388516U (en) * | 2015-12-25 | 2016-07-20 | 华南师范大学 | Optically active interference measurement device in whirlpool |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120307247A1 (en) * | 2011-05-31 | 2012-12-06 | Nanyang Technological University | Fluorescence Microscopy Method And System |
-
2015
- 2015-12-25 CN CN201511000590.9A patent/CN105509902B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940520A (en) * | 2014-04-10 | 2014-07-23 | 昆明理工大学 | Device and method for detecting topological charge number of vortex beams based on improved Mach-Zehnder interferometer |
| CN104121996A (en) * | 2014-07-21 | 2014-10-29 | 河南科技大学 | Measuring device for measuring vortex light beam high-order topological charge |
| CN104280141A (en) * | 2014-10-20 | 2015-01-14 | 西北工业大学 | Beam splitter prism and method and device for detecting topological charge of vortex beam |
| CN105115607A (en) * | 2015-08-10 | 2015-12-02 | 河南科技大学 | Apparatus of using cross double slit interference to measure vortex light beam topology load value and method thereof |
| CN205388516U (en) * | 2015-12-25 | 2016-07-20 | 华南师范大学 | Optically active interference measurement device in whirlpool |
Non-Patent Citations (1)
| Title |
|---|
| 《Measuring the fractional topological charge of LG beams by using interference intensity analysis》;Xinzhong Li 等;《OpticsCommunications》;20140902;第235-239页 * |
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