CN114697582A - Ghost imaging method using classical entanglement - Google Patents
Ghost imaging method using classical entanglement Download PDFInfo
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- CN114697582A CN114697582A CN202210322023.9A CN202210322023A CN114697582A CN 114697582 A CN114697582 A CN 114697582A CN 202210322023 A CN202210322023 A CN 202210322023A CN 114697582 A CN114697582 A CN 114697582A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 24
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000002596 correlated effect Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2441—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using interferometry
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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
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Abstract
The invention relates to a method for realizing ghost imaging by utilizing classical entanglement. The method utilizes a computing mechanism to establish a multimode vortex light beam loaded with a twisted phase, and the multimode vortex light beam is formed by the incoherent superposition of a plurality of single-mode vortex optical rotations. The light beam is shot into the CCD camera after passing through the object to be imaged, product operation is carried out by utilizing a shot light intensity data matrix and transmission operation data of the prepared distorted multimode vortex light beam, and second-order correlated spatial distribution of the object is obtained, so that an image of the object to be imaged is obtained. The invention introduces the classic entanglement into the ghost imaging, realizes the new classic entangled ghost imaging method, has good anti-turbulence characteristic, has no special requirement on optical elements and has simple structure.
Description
Technical Field
The invention belongs to the field of ghost imaging research, and relates to a classic entangled ghost imaging scheme.
Background
Classical entanglement represents the entanglement between different degrees of freedom of a single system that occurs in classical systems, and the presence of a twisted phase in a random beam results in classical entanglement between the degrees of freedom of the beam phase space.
The ghost imaging obtains the space or phase distribution information of the object by performing correlation operation on the light intensity fluctuation information of the test light path and the reference light path. This imaging method enables a separation of detection and imaging, i.e. off-object imaging. The imaging quality of a ghost imaging system can be affected by light source correlation characteristics, object material, shape, and scattering.
The light beam drift caused by the atmospheric disturbance can cause vortex light power fluctuation and flicker, so that the imaging resolution is lowered when ghost imaging is carried out. The disturbance can be resisted by adopting the classical entanglement, but the preparation of the high-dimensionality classical entanglement for ghost imaging is still an unsolved problem in the prior art.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for ghost imaging by using classical entanglement.
The purpose of the invention is realized by the following technical scheme.
A method for realizing ghost imaging by utilizing classical entanglement is characterized in that a beam output by a laser sequentially passes through a spatial light modulator to obtain a twisted multimode vortex beam and prepare a classical entangled state; the light beams are emitted into a CCD camera, and the CCD camera shoots and stores the incident light beams at a certain frequency; before being detected by a camera, the light beam passes through an object to be imaged, wherein the object can be a real object or a virtual object loaded in a camera target surface array in a digital matrix form; performing summation operation on the shot light intensity data matrix to obtain barrel detection information of a detection light path; performing transmission operation on the distorted multimode vortex light beam prepared by the spatial light modulator, and calculating a light intensity matrix of the distorted multimode vortex light beam in a reference light path; and performing product operation on the barrel detection signal of the detection light path and the light intensity matrix of the reference light path to obtain the second-order correlated spatial distribution of the object, thereby obtaining the image of the object to be imaged.
The laser-generated beam passes through a Spatial Light Modulator (SLM) where a number of off-axis vortex sub-beams U (x-a) with different centers of perturbation are constructed using a computational hologram (CGH)j，y-bjL) and coherently superimposed to construct a perturbed single-mode vortex rotation, the mathematical expression of the superimposed field complex amplitude being:
wherein L is the topological charge of the single-mode vortex light beam, x and y are the horizontal and vertical coordinates of the superimposed field, (a)j，bj) Is the perturbation center coordinate of the sub-beam, j is the number of the sub-beams in the array, N is the number of the sub-beam array, phijTo add a phase, whichValues are randomly distributed between 0 pi and 2 pi, and subscript k is the number of time;
optically rotating a plurality of disturbed single-mode vortices Ek(x, y, L) carrying out incoherent superposition to construct a multimode vortex light field, and loading a distortion disturbance HxyGenerating an optical field E with classical entanglementk(x, y), the expression of which is as follows:
Ek(x，y)＝[Ek(x，y，L1)+…+Ek(x，y，Ln)]×Hxy
wherein L is1…LnIs the topological charge value of each superposed single-mode vortex rotation. Torsional disturbance of Hxy＝exp(μ0α(xbj-yaj) In which μ0For the warping factor, α is a constant factor.
The invention has the beneficial effects that:
1. the ghost imaging method is realized by using the classical entanglement, and the optical element of the ghost imaging method has no special requirement, simple structure and easy adjustment.
2. The generated light beam has a twisted phase structure and a multimode vortex phase structure, and the ghost imaging resolution is not lowered compared with that of the light beam with a single structure in a turbulent flow environment.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention, which is used for implementing ghost imaging by using classical entanglement.
Detailed Description
The present invention will be further described with reference to the following examples, which are illustrative of the present invention and are preferred embodiments of the present invention, but the present invention is not limited to the following examples.
As shown in fig. 1, it is a schematic structural diagram for implementing ghost imaging by using classical entanglement provided in an embodiment of the present invention: it comprises a laser 1; a spatial light modulator 2; a computer 3; an object 4 to be imaged; a CCD detector 5;
in this embodiment, the computer 3 generates a calculation hologram according to a formula, and loads the CGH to the liquid crystal screen of the spatial light modulator 2 to play at a specific speed; opening the laser 1, so that a beam output by the laser 1 passes through the spatial light modulator 2 to obtain a twisted multimode vortex beam; the obtained light beam is received by a CCD detector 5 after passing through an object 4 to be imaged; and respectively carrying out summation operation on the shot light intensity data matrix and transmission operation on the twisted multi-mode vortex light beam prepared by the spatial light modulator, and then carrying out product operation on the two to obtain the second-order correlated spatial distribution of the object so as to obtain the image of the object to be imaged.
Claims (1)
1. A method of ghost imaging using classical entanglement, comprising the steps of:
(1) the laser-generated beam passes through a Spatial Light Modulator (SLM) where a number of off-axis vortex sub-beams U (x-a) with different centers of perturbation are constructed using a computational hologram (CGH)j,y-bjL) and coherently superimposed to construct a perturbed single-mode vortex rotation, the mathematical expression of the superimposed field complex amplitude being:
wherein L is the topological charge of the single-mode vortex light beam, x and y are the horizontal and vertical coordinates of the superimposed field, (a)j,bj) Is the perturbation center coordinate of the sub-beam, j is the number of the sub-beams in the array, N is the number of the sub-beam array, phijThe phase is added, the values of the phase are randomly distributed between 0 pi and 2 pi, and subscript k is the number of time;
(2) optically rotating a plurality of disturbed single-mode vortices Ek(x, y, L) carrying out incoherent superposition to construct a multimode vortex light field, and loading a distortion disturbance HxyGenerating an optical field E with classical entanglementk(x, y), the expression of which is as follows:
Ek(x,y)＝[Ek(x,y,L1)+…+Ek(x,y,Ln)]×Hxy
wherein L is1…LnIs the topological charge value of each superposed single-mode vortex optical rotation; torsional disturbance of Hxy＝exp(μ0α(xbj-yaj) In which μ0α is a constant factor, a distortion factor;
(3) the light beam with the classic entanglement is shot into a CCD camera, and the CCD camera shoots and stores the incident light beam at a certain frequency; before being detected by a camera, the light beam passes through an object to be imaged, wherein the object can be a real object or a virtual object loaded in a camera target surface array in a digital matrix form; carrying out summation operation on the shot light intensity data matrix to obtain barrel detection information of a detection light path; performing transmission operation on the distorted multimode vortex light beam prepared by the spatial light modulator, and calculating a light intensity matrix of the distorted multimode vortex light beam in a reference light path; and performing product operation on the barrel detection signal of the detection light path and the light intensity matrix of the reference light path to obtain the second-order correlated spatial distribution of the object, thereby obtaining the image of the object to be imaged.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019306A (en) * | 2016-05-05 | 2016-10-12 | 西安交通大学 | Underwater target detecting device based on ghost imaging calculation principle |
| CN111596465A (en) * | 2020-06-28 | 2020-08-28 | 中国计量大学 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
| US20210080382A1 (en) * | 2019-09-17 | 2021-03-18 | Robert Alfano | Method for imaging biological tissue using polarized majorana vector and complex vortex photons from laser and supercontinuum light sources |
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- 2022-03-29 CN CN202210322023.9A patent/CN114697582B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019306A (en) * | 2016-05-05 | 2016-10-12 | 西安交通大学 | Underwater target detecting device based on ghost imaging calculation principle |
| US20210080382A1 (en) * | 2019-09-17 | 2021-03-18 | Robert Alfano | Method for imaging biological tissue using polarized majorana vector and complex vortex photons from laser and supercontinuum light sources |
| CN111596465A (en) * | 2020-06-28 | 2020-08-28 | 中国计量大学 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
Non-Patent Citations (1)
| Title |
|---|
| 贺腾;: "二阶关联成像与经典成像的比对研究", 价值工程, no. 30, 28 October 2016 (2016-10-28) * |
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