CN207281390U - The system for producing local score rank Bezier vortex beams - Google Patents
The system for producing local score rank Bezier vortex beams Download PDFInfo
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- CN207281390U CN207281390U CN201720818328.3U CN201720818328U CN207281390U CN 207281390 U CN207281390 U CN 207281390U CN 201720818328 U CN201720818328 U CN 201720818328U CN 207281390 U CN207281390 U CN 207281390U
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Abstract
A kind of system for producing local score rank Bezier vortex beams is the utility model is related to, is designed in order to obtain in transmission direction axis upper topology lotus number with apart from consecutive variations and with the vortex beams of wavelength change.The system that the utility model produces local score rank Bezier vortex beams, including：What is set gradually on beam Propagation path expands light beam, so that the spot size for expanding the light beam after processing can cover the beam expanding lens and spiral slit structure of spiral slit；Wherein, spiral slit structure, the spiral slit structure are which is provided with the lighttight optical element of remainder beyond a printing opacity, the spiral slit of notch and spiral slit.Technology is longitudinally manipulated as the utility model can handle many challenges faced in remote sensing and multiband data communication even data encryption.
Description
Technical field
It the utility model is related to a kind of system for producing local score rank Bezier vortex beams.
Background technology
Vortex beams are the light beams for having scroll phase distribution, and phase factor exp [il θ], light are carried in its expression formula
Each photon in beam carries the orbital angular momentum of l, and wherein l is known as topological charge number.Since vortex beams have orbital angular momentum
L, entrained orbital angular momentum can pass to particulate, to drive particulate to rotate, can also realize to micron, submicron particle
This instrument is visually known as " optical wrench " by capture, translation, people.In addition vortex beams also have larger on information coding
Application prospect, information can be encoded and transmitted using the orbital angular momentum of vortex beams.This new coding mode
There are many uniquenesses：(1) since the value of topological charge number l can be integer, zero, or even fraction, so having higher
Code capacity.(2) there is the confidentiality of higher.Thus the measurement tool to vortex beams topological charge number has very important significance.
Based on above-mentioned characteristic, vortex beams are realizing that driving particle rotates, information encodes, there have on biomedical, optical transmission of information to be larger
Application prospect.
The designer is actively subject to research and innovation, is to found a kind of generation local score rank Bezier vortex beams
System, makes it with more the utility value in industry.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide and a kind of can both be opened up in the transmit direction
Vortex beams of the lotus number with transmission range consecutive variations are flutterred, vortex beams of the topological charge number with wavelength change can also be obtained
Generation local score rank Bezier vortex beams system.
To reach above-mentioned purpose of utility model, method that the utility model produces local score rank Bezier vortex beams,
Including：What is set gradually on beam Propagation path expands light beam, so as to expand the spot size energy of the light beam after processing
Enough cover the beam expanding lens and spiral slit structure of spiral slit；
Wherein, spiral slit structure, the spiral slit structure are which is provided with a printing opacity, the spiral slit of notch and spiral shell
The lighttight optical element of remainder beyond slit is revolved, the printing opacity, the radius of spiral slit of notch meet the following formula
In formula, r0It is the radius in the spiral slit of printing opacity, notch at radius minimum, α is a spiral transmissive slit
The angle between point at upper other points and radius minimum, N is definite value；
Light beam after expanding passes through the spiral slit structure, and generation is in transmission direction after the spiral slit structure
Upper topology lotus number with transmission range consecutive variations, and in the transmit direction topological charge number with the vortex beams of wavelength change.
Further, the digital sensor of the viewing plane after being arranged on spiral slit structure is further included, the numeral passes
Light spot shape at sensor recording distance spiral slit structure different distance.
Further, the digital sensor is arranged on apart from spiral slit structural transmission distance z=1m, z=1.14m, z
=1.34m, z=1.56m, record topological charge is respectively m=2, m=1.17, m=1.5, m=1.3 at z=1.89m, m=1's
Vortex beams.
Further, transmissive spatial optical modulator loading printing opacity, the spiral slit of notch and lightproof part form institute
State spiral slit structure.
According to the above aspect of the present invention, the utility model produces the system of local score rank Bezier vortex beams at least with following
Advantage：
The utility model sets a spiral slit structure, and the light beam after expanding passes through the spiral slit structure, when a branch of
When plane wave incidence is on screen, the increment of two phase near points along slit upper angle is Δ α, (r respectively on incidence waveα, α),
(rα+ Δ α, α+Δ α), the phase difference that the point (0,0, z) on viewing plane is reached after different distances be the π Δs ρ of Δ θ=2/
λ, wherein Δ ρ=ρα+Δα-ρα, the phase shift if the π of Δ ρ=l λ Δs α/2 on whole slit is constant.Can be
Viewing plane obtains the vortex beams that a topological charge is l, the topological charge number at vortex beams center in propagation distance of generation
It is inversely proportional with distance.Therefore, the utility model can not only obtain in the transmit direction topological charge number as transmission range is continuous
The vortex beams of change, can also obtain vortex beams of the topological charge number with wavelength change.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand the skill of the utility model
Art means, and being practiced according to the content of specification, with the preferred embodiment of the utility model and coordinate attached drawing detailed below
Describe in detail bright as after.
Brief description of the drawings
Fig. 1 is the system schematic that the utility model produces local score rank Bezier vortex beams；Wherein：1st, laser
Device；2nd, beam expanding lens；3rd, transmissive spatial optical modulator；4th, wave front detector；
Fig. 2 is the narrow slit structure figure for the system that the utility model produces local score rank Bezier vortex beams；
Fig. 3 is the schematic diagram and actual loaded for the system that the utility model produces local score rank Bezier vortex beams
Spiral slit and parameters on to transmissive spatial optical modulator；Black plane is the spiral slit added, and grey is put down
Face is viewing plane.
Embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not intended to limit the scope of the present invention.
Explanation：Topological charge number of the vortex beams in transmitting procedure is conservation, in the utility model, at center
On axis in regional area topological charge number change.Therefore, the topological charge number mentioned in the utility model with transmission range change
Centered on axis regional area change, be referred to as local score rank.
The utility model is directed to the consecutive variations apart from upper topology lotus number in transmission axis center, it means that for required
The topological charge amount wanted, it is only necessary to change distance and can be obtained by corresponding topological charge number.And possess its non-diffraction beam.And
Wavelength can be changed so as to obtain required topological charge number.
Embodiment 1
The system that the present embodiment produces local score rank Bezier vortex beams, including：
Laser 1, the laser are the solid state laser of 100mw, its optical maser wavelength launched is 532nm；
Beam expanding lens 2, the beam-expanding system that the laser beam for being sent to the laser is expanded, the spot size after expanding
Need the size more than spiral slit；
Spiral slit structure 3：As shown in Figure 2, white is slit to the spiral slit structure, and printing opacity, black is light tight
Part, its radius need coincidence formulaWherein r0It is the radius in spiral slit at radius minimum, α is
The angle between point in one spiral slit at other point and radius minimums, N is definite value, in practical application, the value of N
Need the wavelength X in view of light source, estimated viewing plane and the scope of the distance z of spiral slit structure and opening up for desired acquisition
Lotus amount size l scopes are flutterred, finally meet N=l × z × λ；r0Need to meet with the relation of N
In the present embodiment, r is made0=0.028mm, α be in a spiral slit other points and the point at radius minimum it
Between angle, be 532nm due to making wavelength X, make l=2, z=4000/lmm.
Embodiment 2
The system that the present embodiment produces local score rank Bezier vortex beams, on the basis of embodiment 1, further includes number
Word sensor namely electronic coupled element, for recording the light spot shape at different distance, are confirmed whether to obtain consecutive variations
Topological charge amount.Light after expanding, can be in transmission range z=1m, z=1.14m, z=1.34m, z by spiral slit structure
It is respectively m=2, m=1.17, m=1.5 that topological charge is observed at=1.56m, z=1.89m, the vortex beams of m=1.3, m=1.
Wherein, the phase of vortex beams can be measured by wave front detector.
The various embodiments described above operation principle：
Zero-order Bessel light beam is considered the Fourier transformation of narrow annular channel, therefore, observes shellfish plug for the first time
Your light beam is by placing a narrow annular channel on the focal plane of convex lens.When single color plane ripple incides narrow annular channel
After on screen, in the propagation direction, transmitted wave can carry out identical position phase transfer same after annulus apart from upper.Here it is for
The reason for what can beat to obtain a bright spot in the bosom of hot spot, that is, being exactly zero-order Bessel light beam in fact.But if
Narrow annular channel is destroyed, and becomes spiral slit, then in the axial field of viewing plane, transmitted wave will be by spiral slit
Different parts carry out different position phase transfers.That is, continuous phase shift is generated along spiral slit, and can be in light
Phase singularity is seen on axis.
Build a slit, wherein rαIt is radius and angle respectively with α, r0It is the initial radium of spiral slit.ραIt is a little
(rα, α, 0) and to the distance of (0,0, z) on viewing plane.When on a branch of plane wave incidence to screen, on incidence wave two it is close
It is Δ α, (r respectively to put along the increment of slit upper angleα, α), (rα+ Δ α, α+Δ α), observation is reached after different distances
The phase difference of point (0,0, z) in plane is Δ θ=2 π Δ ρ/λ, wherein Δ ρ=ρα+Δα-ρα, if the π of Δ ρ=l λ Δs α/2
Phase shift on whole slitIt is constant.This means that the phase in viewing plane
Closed circuit of the position wavefront on axis is 2 π l.That is, be exactly to have optical eddy on the viewing plane, and l is topological charge
Number, to obtain helical phase, one spiral slit of framework, its mathematic(al) representation is:
Thus the vortex beams that a topological charge is l can be obtained in viewing plane, in addition, above-mentioned expression formula lz's multiplies
After product is fixed, as the l at the increase center of propagation distance can be gradually reduced.Namely the vortex beams produced are in propagation distance
The topological charge number and distance at center are inversely proportional.
When the notch of spiral slit is much smaller than radius, spiral slit can be regarded as annular to a certain extent
Slit.Therefore, vortex beams can approximately be regarded as Bezier vortex beams.In Fresnel approximation, spread out after propagating z distances
The complex amplitude of irradiating light beam can be obtained by following diffraction formula
Wherein T (x, y) is the aperture function of spiral slit.
It can obtain simulating the light intensity and phase place change with Distance Transmission vortex beams by above-mentioned expression formula.And incite somebody to action
The expression formula of spiral slit is loaded into spatial light modulator after being drawn with program simulation, with regard to that can carry out experiment proof.
Since the value of topological charge number can be integer, zero, or even fraction, so the code capacity with higher.Therefore
Also there is the confidentiality of higher.Thus the measurement tool to vortex beams topological charge number has very important significance.Based on above-mentioned characteristic,
Vortex beams are realizing that driving particle rotates, information encodes, are having larger application prospect on biomedical, optical transmission of information.This
Utility model can not only obtain obtaining with the vortex beams apart from consecutive variations in transmission direction axis upper topology lotus number
To topological charge number with the vortex beams of wavelength change.Such longitudinal direction manipulation technology can be handled in remote sensing and multiband data communication
The many challenges even faced in data encryption.
The above is only the preferred embodiment of the utility model, is not intended to limit the present invention, it is noted that
For those skilled in the art, on the premise of the utility model technical principle is not departed from, can also do
Go out some improvement and modification, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (4)
- A kind of 1. system for producing local score rank Bezier vortex beams, it is characterised in that including：On beam Propagation path according to Secondary setting expands light beam, so that the spot size for expanding the light beam after processing can cover the beam expanding lens of spiral slit And spiral slit structure；Wherein, spiral slit structure, the spiral slit structure are which is provided with a printing opacity, the spiral slit of notch and spiral narrow The lighttight optical element of remainder beyond seam, the printing opacity, the radius of spiral slit of notch meet the following formula<mrow> <msub> <mi>r</mi> <mi>&alpha;</mi> </msub> <mo>=</mo> <msup> <mrow> <mo>(</mo> <msup> <msub> <mi>r</mi> <mn>0</mn> </msub> <mn>2</mn> </msup> <mo>+</mo> <mfrac> <mrow> <mi>N</mi> <mi>&alpha;</mi> </mrow> <mi>&pi;</mi> </mfrac> <mo>)</mo> </mrow> <mrow> <mn>1</mn> <mo>/</mo> <mn>2</mn> </mrow> </msup> </mrow>In formula, r0Be in the spiral slit of printing opacity, notch radius minimum at radius, α be on a spiral transmissive slit other Point and radius minimum at point between angle, N is definite value；Light beam after expanding passes through the spiral slit structure, generates after the spiral slit structure and opens up in the transmit direction Lotus number is flutterred with transmission range consecutive variations, and in the transmit direction topological charge number with the vortex beams of wavelength change.
- 2. the system according to claim 1 for producing local score rank Bezier vortex beams, it is characterised in that further include The digital sensor for the viewing plane being arranged on after spiral slit structure, the digital sensor recording distance spiral slit structure Light spot shape at different distance.
- 3. the system according to claim 2 for producing local score rank Bezier vortex beams, it is characterised in that the number Word sensor is arranged on apart from spiral slit structural transmission distance z=1m, z=1.14m, z=1.34m, z=1.56m, z= It is respectively m=2, m=1.17, m=1.5 that topological charge is recorded at 1.89m, the vortex beams of m=1.3, m=1.
- 4. the system according to claim 1 for producing local score rank Bezier vortex beams, it is characterised in that transmission-type Spatial light modulator loading printing opacity, the spiral slit of notch and lightproof part form the spiral slit structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720818328.3U CN207281390U (en) | 2017-07-07 | 2017-07-07 | The system for producing local score rank Bezier vortex beams |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238933A (en) * | 2017-07-07 | 2017-10-10 | 苏州大学 | Produce the method and system of local score rank Bezier vortex beams |
| CN109254401A (en) * | 2018-11-14 | 2019-01-22 | 苏州大学 | It is a kind of to generate the secretly method and device with anti-dark Beams |
| CN115453752A (en) * | 2022-09-19 | 2022-12-09 | 苏州大学 | Design method of vortex beam mask plate with abnormal radius |
-
2017
- 2017-07-07 CN CN201720818328.3U patent/CN207281390U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238933A (en) * | 2017-07-07 | 2017-10-10 | 苏州大学 | Produce the method and system of local score rank Bezier vortex beams |
| CN107238933B (en) * | 2017-07-07 | 2023-08-25 | 苏州大学 | Method and system for generating a local fractional order Bessel vortex beam |
| CN109254401A (en) * | 2018-11-14 | 2019-01-22 | 苏州大学 | It is a kind of to generate the secretly method and device with anti-dark Beams |
| CN109254401B (en) * | 2018-11-14 | 2023-12-15 | 苏州大学 | Method and device for generating dark and anti-dark non-diffraction light beams |
| CN115453752A (en) * | 2022-09-19 | 2022-12-09 | 苏州大学 | Design method of vortex beam mask plate with abnormal radius |
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