CN103776795B - A kind of Terahertz-Stokes two-photon of spherical wave pumping tangles imaging device - Google Patents
A kind of Terahertz-Stokes two-photon of spherical wave pumping tangles imaging device Download PDFInfo
- Publication number
- CN103776795B CN103776795B CN201310754677.XA CN201310754677A CN103776795B CN 103776795 B CN103776795 B CN 103776795B CN 201310754677 A CN201310754677 A CN 201310754677A CN 103776795 B CN103776795 B CN 103776795B
- Authority
- CN
- China
- Prior art keywords
- photon
- terahertz
- stokes
- tangles
- imaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Terahertz-Stokes two-photon that the present invention discloses a kind of spherical wave pumping tangles imaging device, comprises pump light source, half-wave plate, polarization beam apparatus, imaging len, MgO:LiNbO3Crystal, Terahertz photon collecting lens, narrow band filter slice, Terahertz single-photon detector, single photon counter, coincidence measurement device and computer; From the pump light of pump light source outgoing, by half-wave plate and polarization beam apparatus incident imaging len, the convergent beam that formation corrugated is spheric, encourages MgO:LiNbO3Crystal produces THz wave photon and the Stokes photon with the character of tangling. On terahertz light sub transmission path, place object to be imaged, Terahertz photon collecting lens, narrow band filter slice, Terahertz single-photon detector. On stokes light sub transmission path, the single-photon detector that placement is added with optical fiber receives its photon, and does aerial image scanning. The signal of Terahertz single-photon detector and single-photon detector output enters coincidence measurement device, and uses computer generated image.
Description
Technical field
The present invention relates to terahertz light art of electronics, be specifically related to a kind of spherical wave pumping tooHertz-Stokes two-photon tangles THz wave imaging device.
Background technology
THz wave is a kind of electromagnetic wave within the scope of wavelength 30 μ m-3mm, is very tool of oneThere is the electromagenetic wave radiation of scientific research value. It is to most of non-polar materials, sand and dust, plastics polymerizationThing, plank, paper, semi-conducting material etc. all have higher penetrability, and THz wave photonEnergy be only the energy 1/10 of x-ray photon6, can not produce harmful ionization to biological tissue, because ofThis THz wave imaging technique be widely used at present safety inspection, weapon guidance, anti-terrorism,In the application technologies such as biomedical imaging, therefore it also become acoustics imaging technology, infrared imaging skillThe useful of art and x-ray imaging technology supplemented.
At present, common THz wave imaging technique be mainly THz wave time-domain spectroscopy imaging technique andTHz wave imaging technique continuously. THz wave time-domain spectroscopy imaging technique is mainly by containing intoThe conversion of the ultrashort terahertz-wave pulse of picture object information from time domain to frequency domain, just can acquire the strong of itDegree and the space distribution information of phase place, and then can obtain the THz wave image of object, and objectThe information such as Spatial Density Distribution, refractive index. But this THz wave imaging system light channel structureFor complexity, stability of layout is poor, and the femto-second laser that is used for producing THz wave is expensive. ConnectContinuous THz wave imaging technique is to see through after object (or through object reflection) by recording THz waveStrength information be embodied as picture. Compared with time-domain spectroscopy imaging system, at image-forming data acquisition with locateComparatively simple, rapid in reason mode, imaging system structure is also relatively simple. The master of this imaging techniqueWanting shortcoming is that amount of image information is few, and in experiment, phase can occur the multiple reflections of THz wave in light pathDry stack, causes may having interference fringe in image.
In above-mentioned two kinds of common THz wave imaging techniques, also all have following deficiency: (1)In the time carrying the THz wave of imaging object information and transmit in space, be easy to be subject to external environment, allAs the random disturbances of Air Flow, humidity variation, flue dust etc., the antijamming capability of imaging system is poor;(2) because the wavelength of conventional terahertz radiation source is generally hundred microns or millimeter magnitude, therefore rootAccording to Rayleigh diffraction limit principle, imaging resolution is also generally same order.
At Chinese patent (application number 201210548593.6), disclose and a kind ofly tangled based on two-photonTHz wave imaging device, imaging len is wherein to be placed in terahertz in the combination of the first imaging system, in photon transmission path, in the combination of the second imaging system, be to be hereby placed in Stokes photon transmission roadIn footpath. In these two kinds of imaging combinations, in given object space to be imaged and image scanning face positionSituation under, imaging formula defines imaging len at terahertz light sub transmission path or stokes lightPutting position in sub transmission path. This imaging len is placed in and tangles two-photon transmission pathImaging device, in actual imaging operation comparatively inconvenience, has limited this imaging device in practiceApplication. And, in the first imaging combination, be placed in the imaging len of terahertz light sub transmission path,Be generally to be made by white polyethylene material or TPX material, inevitably can have Terahertz photonCertain loss, this is comparatively disadvantageous to imaging.
Summary of the invention
The defect or the deficiency that exist for above-mentioned prior art, the object of the invention is to, and provides a kind ofTerahertz-Stokes two-photon of spherical wave pumping tangles imaging device, and this apparatus structure is simple, non-Area-located, resolution ratio is high, antijamming capability is strong.
In order to realize above-mentioned task, the present invention adopts following technical solution:
Terahertz-Stokes two-photon of spherical wave pumping tangles an imaging device, comprises pump lightSource, half-wave plate, polarization beam apparatus, imaging len, MgO:LiNbO3Crystal, Terahertz photon are receivedCollection lens, narrow band filter slice, Terahertz single-photon detector, single photon counter, coincidence measurement dressPut, computer;
From the pump light of pump light source outgoing by half-wave plate and polarization beam apparatus, incident imaging len,The convergent beam that formation corrugated is spheric, excitation MgO:LiNbO3Crystal produces has the character of tanglingTHz wave photon and Stokes photon, wherein:
On terahertz light sub transmission path, place object to be imaged, Terahertz photon collecting lens, narrowBand filter plate, Terahertz single-photon detector; On stokes light sub transmission path, placement is added withThe single-photon detector of optical fiber pigtail receives its photon, and can do aerial image scanning.
Described imaging len is convex lens.
The first-selected K9 glass of material or the BK7 glass of described imaging len.
Described MgO:LiNbO3Crystal is that X-Y-Z mode is cut, and has one 25 ° at pump light exit endCutting angle; At two Y-Z face optical polish, and plating and the corresponding anti-reflection film of pump light wavelength.
Described pump light is as far as possible near MgO:LiNbO3The friendship of crystal-cut angle place's cut surface and Y-Z facePlace of boundary.
Described Terahertz photon collecting lens is made up of high density white polyethylene or TPX material.
Described coincidence measurement device is made up of time-to-amplitude conversion instrument and multichannel analyzer.
Terahertz-Stokes two-photon of spherical wave pumping of the present invention tangles imaging device, has behaviourDo flexible, simple in structure, antijamming capability is strong, resolution ratio is high, non-localized formula etc. advantage, can be wideGeneral for fields such as military surveillance, remote sensing, biomedical imaging, safety and anti-terrorisms, application prospect is huge.Compared with existing common THz wave imaging technique, have the following advantages:
(1), in this THz imaging technology, imaging len is to be placed on pump light transmission path,Exactly be placed in polarization beam apparatus and produce the MgO:LiNbO that tangles two-photon3Between crystal,Instead of be placed on the transmission path of Terahertz photon or Stokes photon. Its conventional material (K9 glassGlass or BK7 glass) very little to the absorption of pump light, substantially negligible, to whole imaging beSystem impact is very little, has ensured image quality, has also reduced to a certain extent the requirement to experiment condition.
(2) Terahertz-Stokes two-photon of this employing spherical wave pumping tangles imaging device,The imaging formula that adopts, has determined the placement location of object to be imaged, image scanning face and lens moreFlexibly, improved this imaging device operating flexibility and applicability in actual applications.
Brief description of the drawings
Fig. 1 is that Terahertz-Stokes two-photon of spherical wave pumping of the present invention tangles imaging deviceStructural representation.
Fig. 2 is MgO:LiNbO3The cutting mode schematic diagram of crystal.
Fig. 3 is wave vector, the wave vector of Stokes photon and the wave vector of Terahertz photon of pump light photonSatisfied non-colinear phase matched schematic diagram.
Label in figure represents respectively, 1, Nd:YAG laser instrument, 2, half-wave plate, 3, polarization dividesBundle device, 4, imaging len, 5, MgO:LiNbO3Crystal, 6, Terahertz photon, 7, to be imagedObject, 8, Terahertz photon collecting lens, 9, narrow band filter slice, 10, Terahertz single photon detectionDevice, 11, Stokes photon, 12, single photon counter, 13, coincidence measurement device, 14, meterCalculation machine.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Detailed description of the invention
Referring to Fig. 1, in the present embodiment, pump light source 1 is pulse laser, and its wavelength is not construed as limiting,Only otherwise be MgO:LiNbO3Crystal 5 absorbs and meets the demands, first-selected electric-optically Q-switched Pulse Nd: YAGLaser instrument.
Utilize electric-optically Q-switched Pulse Nd: (wavelength is λ to the fundamental frequency light of YAG laser instrument 1P) as pumpPu light source, the polarization direction of pump light is parallel to MgO:LiNbO3The Z-direction of crystal 5. PumpingLight passes through after half-wave plate 2 and polarization beam apparatus 3, and the imaging len 4 that is f by focal length is assembled, and forms rippleFace is the pump light of sphere, is then incident to MgO:LiNbO3Crystal 5(doping content is 5%mol)In. By rotation half-wave plate 2, control and be incident to MgO:LiNbO3Pump energy in crystal 5,Thereby the THz wave photon 6(wavelength that generation nondegenerate two photon tangles is λT) and Stokes photon11(wavelength is λS). Imaging len 4 to MgO:LiNbO3Terahertz photon and the Si Tuo of crystal 5The distance of the output of gram this photon is d.
MgO：LiNbO3Crystal 5 cutting modes as shown in Figure 2. Due to THz wave photon 6 HesIn stokes light photon 11 production processes, the wave vector k of pump light photonPump, Stokes photonWave vector kStokesWave vector k with Terahertz photonTHzMeet non-colinear phase matched process (as shown in Figure 3),And terahertz light wavelet is vowed and large (approximately 65 °) of pump light photon wave vector angle. At MgO:LiNbO3The pump light exit end of crystal 5 cuts one jiao, and as shown in Figure 2, cutting angle is 25 °, make produceTHz wave photon 6 is from the vertical outgoing of cut surface. Cut surface carries out optical polish. Meanwhile, produceStokes photon 11 will be from MgO:LiNbO3Y-Z face place's outgoing of crystal 5. Pump light as far as possibleNear MgO:LiNbO3The intersection of the cut surface of crystal 5 and Y-Z face, to shorten the Terahertz glistening light of wavesThe transmission path of son in crystal. The logical light face of two Y-Z is carried out to optical polish, and plating and pump lightThe anti-reflection film that wavelength is corresponding.
On the transmission path of THz wave photon 6, place object 7 to be imaged. From MgO:LiNbO3Crystal 5 cut surfaces are Z to the distance of object 7 to be imaged1. The THz wave photon of carrying object informationAssembled by a Terahertz photon collecting lens 8 of being made by high density white polyethylene or TPX material,Place Terahertz single-photon detector 10 at its focus place. Before Terahertz single-photon detector 10, add oneNarrow band filter slice 9, in order to filtering veiling glare.
On the transmission path of Stokes photon 11, place a single-photon detector that is added with optical fiber pigtail12, this single-photon detector can do the planar imaging scanning perpendicular to stokes light sub transmission path.From MgO:LiNbO3The Stokes photon output face of crystal 5 is flat to single-photon detector 12 scanningsThe distance of face is Z2. The signal that Terahertz single-photon detector 10 and single-photon detector 12 are exported entersEnter the coincidence measurement device 13 being formed by time-to-amplitude conversion instrument and multichannel analyzer, and enter with computer 14Row image-forming data acquisition. In the time meeting following imaging formula:
Just can obtain clearly as.
It should be noted that, above-mentioned is optimal way of the present invention with embodiment, should be understood to by above-mentionedEmbodiment further understands the present invention for those skilled in the art, the invention is not restricted to above-mentionedEmbodiment, on the technical scheme basis that those skilled in the art provides at above-described embodiment, has doneInterpolation and equivalence replace, all should belong to protection scope of the present invention.
Claims (7)
1. Terahertz-Stokes two-photon of spherical wave pumping tangles an imaging device, it is characterized in that, comprises pumpPu light source (1), half-wave plate (2), polarization beam apparatus (3), imaging len (4), MgO:LiNbO3Crystal (5),Terahertz photon collecting lens (8), narrow band filter slice (9), Terahertz single-photon detector (10), single-photon detector(12), coincidence measurement device (13), computer (14);
Pass through half-wave plate (2) and polarization beam apparatus (3) from the pump light of pump light source (1) outgoing, incident imaging is saturatingMirror (4), the convergent beam that formation corrugated is spheric, excitation MgO:LiNbO3Crystal (5) produces has the property of tanglingThe THz wave photon (6) of matter and Stokes photon (11); Wherein:
On Terahertz photon (6) transmission path, place object to be imaged (7), Terahertz photon collecting lens (8), narrowBand filter plate (9), Terahertz single-photon detector (10); On Stokes photon (11) transmission path, placeThe single-photon detector (12) that is added with optical fiber pigtail receives its photon, and can do aerial image scanning;
Terahertz single-photon detector (10) is connected respectively and meets measurement mechanism (13) with single-photon detector (12),Coincidence measurement device (13) connects computer (14);
Described MgO:LiNbO3Crystal (5) cuts for X-Y-Z mode, and has the cutting of one 25 ° at pump light exit endAngle, cut surface optical polish.
2. Terahertz-Stokes two-photon of spherical wave pumping as claimed in claim 1 tangles imaging device, its spyLevy and be, described imaging len (4) is convex lens.
3. Terahertz-Stokes two-photon of spherical wave pumping as claimed in claim 1 tangles imaging device, its spyLevy and be, the material of described imaging len (4) is selected K9 glass or BK7 glass.
4. Terahertz-Stokes two-photon of spherical wave pumping as claimed in claim 1 tangles imaging device, its spyLevy and be, described MgO:LiNbO3Crystal (5) is at two Y-Z face optical polish, and plating and pump light wavelength correspondingAnti-reflection film.
5. Terahertz-Stokes two-photon of spherical wave pumping as claimed in claim 1 tangles imaging device, its spyLevy and be, described pump light is as far as possible near MgO:LiNbO3The boundary of crystal (5) cutting angle place cut surface and Y-Z facePlace.
6. Terahertz-Stokes two-photon of spherical wave pumping as claimed in claim 1 tangles imaging device, its spyLevy and be, described Terahertz photon collecting lens (8) is made up of high density white polyethylene or TPX material.
7. Terahertz-Stokes two-photon of spherical wave pumping as claimed in claim 1 tangles imaging device, its spyLevy and be, described coincidence measurement device (13) is made up of time-to-amplitude conversion instrument and multichannel analyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310754677.XA CN103776795B (en) | 2013-12-31 | 2013-12-31 | A kind of Terahertz-Stokes two-photon of spherical wave pumping tangles imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310754677.XA CN103776795B (en) | 2013-12-31 | 2013-12-31 | A kind of Terahertz-Stokes two-photon of spherical wave pumping tangles imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103776795A CN103776795A (en) | 2014-05-07 |
| CN103776795B true CN103776795B (en) | 2016-05-18 |
Family
ID=50569299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310754677.XA Expired - Fee Related CN103776795B (en) | 2013-12-31 | 2013-12-31 | A kind of Terahertz-Stokes two-photon of spherical wave pumping tangles imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103776795B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489931A (en) * | 2018-05-29 | 2018-09-04 | 天津大学 | A kind of device and method for improving Terahertz parametric oscillation source and measuring stability |
| CN109883911A (en) * | 2019-01-29 | 2019-06-14 | 黑龙江科技大学 | A kind of method of powder concentration measurement and apparatus for measuring dust concentration based on optics aperture |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251492A (en) * | 2008-01-02 | 2008-08-27 | 阮双琛 | Continuous wave HZ real time imaging apparatus and method thereof |
| CN101620273A (en) * | 2009-08-08 | 2010-01-06 | 桂林电子科技大学 | Method for detecting underwater object by relevance imaging |
| CN102419485A (en) * | 2011-10-10 | 2012-04-18 | 天津大学 | Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method |
| CN102590125A (en) * | 2011-11-30 | 2012-07-18 | 天津大学 | Biological tissue moisture measurement device and method based on terahertz wave attenuated total reflectance (ATR) |
| CN102998260A (en) * | 2012-12-17 | 2013-03-27 | 西北大学 | Two-photon entanglement-based terahertz wave imaging device |
| CN102998261A (en) * | 2012-12-17 | 2013-03-27 | 西北大学 | Terahertz wave pseudo heat light source-based imaging device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2416204B (en) * | 2004-07-16 | 2007-03-21 | Teraview Ltd | Apparatus and method for investigating a sample |
| JP5037929B2 (en) * | 2006-12-18 | 2012-10-03 | キヤノン株式会社 | Information acquisition apparatus and method for an object using terahertz waves |
-
2013
- 2013-12-31 CN CN201310754677.XA patent/CN103776795B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251492A (en) * | 2008-01-02 | 2008-08-27 | 阮双琛 | Continuous wave HZ real time imaging apparatus and method thereof |
| CN101620273A (en) * | 2009-08-08 | 2010-01-06 | 桂林电子科技大学 | Method for detecting underwater object by relevance imaging |
| CN102419485A (en) * | 2011-10-10 | 2012-04-18 | 天津大学 | Terahertz frequency comb device based on optical rectification in periodically poled crystal and modulation method |
| CN102590125A (en) * | 2011-11-30 | 2012-07-18 | 天津大学 | Biological tissue moisture measurement device and method based on terahertz wave attenuated total reflectance (ATR) |
| CN102998260A (en) * | 2012-12-17 | 2013-03-27 | 西北大学 | Two-photon entanglement-based terahertz wave imaging device |
| CN102998261A (en) * | 2012-12-17 | 2013-03-27 | 西北大学 | Terahertz wave pseudo heat light source-based imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103776795A (en) | 2014-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nguyen Pham et al. | Enhancement of spatial resolution of terahertz imaging systems based on terajet generation by dielectric cube | |
| CN102998260B (en) | Two-photon entanglement-based terahertz wave imaging device | |
| US10215696B2 (en) | System for determining at least one property of a sheet dielectric sample using terahertz radiation | |
| US9304373B2 (en) | Terahertz wave generation element, terahertz wave detection element, and terahertz time domain spectroscope device | |
| US10073191B2 (en) | Methods and apparatus for broadband angular selectivity of electromagnetic waves | |
| US9091869B2 (en) | Terahertz-wave element, terahertz-wave detecting device, and terahertz time-domain spectroscopy system | |
| CN109791279A (en) | For scanning the autoregistration collimation lens of the traveling of laser | |
| CN104677497B (en) | Detection device and method for properties of terahertz waves | |
| WO2017013759A1 (en) | Far-infrared spectroscopy device | |
| US8759779B2 (en) | Terahertz wave generation element, terahertz wave detection element, and terahertz time domain spectral device | |
| US20150136987A1 (en) | Terahertz wave generator, terahertz wave detector, and terahertz time domain spectroscopy device | |
| CN105637411A (en) | Terahertz wave generating element and terahertz wave detecting element | |
| CN109946710A (en) | A kind of more polarized laser imaging devices of dual wavelength | |
| CN107144545A (en) | All -fiber formula terahertz time-domain spectroscopy instrument | |
| EP2159634A1 (en) | Terahertz-wave optical generating apparatus and corresponding generation method | |
| CN103776795B (en) | A kind of Terahertz-Stokes two-photon of spherical wave pumping tangles imaging device | |
| JP2007199044A (en) | Terahertz wave type measuring apparatus and method | |
| CN102998261B (en) | Terahertz wave pseudo heat light source-based imaging device | |
| CN103763038B (en) | A kind of THz wave communicator based on quantum two-photon entanglement | |
| Zhu et al. | Electric field vector characterization of terahertz surface plasmons | |
| JP2015038599A (en) | Terahertz wave generating device and information acquisition device | |
| RU2515341C2 (en) | Two-photon scanning microscope with automatic precision image focusing and method for automatic precision image focusing | |
| CN110763338B (en) | Energy feedback type hyperspectral imaging device based on acousto-optic tunable filter | |
| CN205826515U (en) | Acoustical signal detector based on surface wave and reflecting light sonomicroscope | |
| JP2019168701A (en) | Far-infrared spectroscopy device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160518 Termination date: 20191231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |