CN207234145U - The system that double plasma adjustable in pitch produces high intensity THz wave - Google Patents
The system that double plasma adjustable in pitch produces high intensity THz wave Download PDFInfo
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- CN207234145U CN207234145U CN201721321529.9U CN201721321529U CN207234145U CN 207234145 U CN207234145 U CN 207234145U CN 201721321529 U CN201721321529 U CN 201721321529U CN 207234145 U CN207234145 U CN 207234145U
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Abstract
The utility model discloses the system that a kind of double plasma adjustable in pitch produces high intensity THz wave, including laser, photoparametric amplifier, chopper, climbing device, laser beam expander, spatial light modulator, speculum, bbo crystal, the first off-axis parabolic mirror, the second off-axis parabolic mirror, filter plate and the silicon chip sequentially set along light path.The utility model can be by adjusting the spacing and symmetry axis rotation angle between the two width Fresnel Lenses phase diagrams loaded in spatial light modulator, and then control the spacing and spatial distribution between double plasma, not only increase the intensity of THz wave, the energy and polarization state of THz wave can also be accurately controlled, the blank in high intensity THz wave generation technology field is compensate for, there is stronger scientific research and actual application value；The system structure of the utility model is simple, build cost low, easy maintenance, high stability, and the THz wave energy of generation is relatively strong, spectrum is wider, beneficial to spectral measurement.
Description
Technical field
The utility model is related to THz wave generation technology field, in particular to it is a kind of it is adjustable in pitch it is double wait from
The system that daughter produces high intensity THz wave.
Background technology
Ultrashort laser pulse is focused in surrounding air to the technology for directly producing Terahertz, causes people's in recent years
Extensive concern, this method (can be remote at several kilometers) can produce THz wave a long way off, so application prospect is very fine.
When the ultrashort laser pulse of high-energy focuses in atmosphere, the air of focal point can occur to ionize and be formed etc. from
Daughter, the pondermotive force thus formed can make to form big density contrast between ionic charge and electron charge, and this electricity
Lotus separation process can cause the generation of strong electromagnetic transients phenomenon, so as to give off Terahertz.
Excitation air list plasma generally is focused on by simple lens using femtosecond laser in conventional experiment, produces terahertz
Hereby ripple.But the THz wave intensity produced is not very big, can not meet use demand.2007, Y.Liu et al. had found a kind of
Simple lens focuses on the method that double plasma produces THz wave, but the spacing of double plasma and spatial distribution can not be controlled accurately
System.2016, a kind of method of front and rear double chevilled silks modulation Terahertz frequency spectrums of Sun Wenfeng et al. utility models, but under setting herein too
Hertz intensity of wave and generation efficiency are been significantly enhanced.
The THz wave of intensity bigger how is produced using air plasma, is that one of those skilled in the art is important
Research direction.
Utility model content
The utility model provides the system that a kind of double plasma adjustable in pitch produces high intensity THz wave, to utilize
Air plasma produces the THz wave of intensity bigger.
To reach above-mentioned purpose, the utility model provides a kind of double plasma adjustable in pitch and produces high intensity terahertz
The hereby system of ripple, it includes laser, photoparametric amplifier, chopper, climbing device, the laser beam expanding sequentially set along light path
Device, spatial light modulator, speculum, bbo crystal, the first off-axis parabolic mirror, the second off-axis parabolic mirror, filtering
Piece and silicon chip, wherein,
The laser that laser emission wavelength is 800nm, polarization direction is vertical direction, afterwards after photoparametric amplifier
Output wavelength is the flashlight of 1300nm or 1550nm, and polarization direction is changed into by flashlight after chopper, by climbing device
Horizontal direction, then spatial light modulator is incident to after being expanded by laser beam expander, two width are mounted with spatial light modulator
Fresnel Lenses phase diagram, two width Fresnel Lenses phase diagrams have the first focus and the second focus respectively, and incident light is turned
It is changed to the light of the parallel focusing of two beams and is projected to speculum and bbo crystal, the two light beams projected via bbo crystal exists respectively
First focus and the second focal point focus on excitation air and produce plasma, and then form terahertz emission source, terahertz emission
The THz wave of source transmitting passes through successively again via the first off-axis parabolic mirror and the reflection of the second off-axis parabolic mirror
Filter plate and silicon chip, that is, obtain high intensity THz wave.
In an embodiment of the utility model, spacing and two plasmas between two width Fresnel Lenses phase diagrams
Between spacing it is equal.
In an embodiment of the utility model, two width Fresnel Lenses phase diagrams on a symmetry axis axisymmetricly, two
The line of a Plasma Center is vertical with symmetry axis, the lines of two Plasma Centers with symmetry axis it is suitable/counterclockwise
Rotate and rotate same direction and same angle.
In an embodiment of the utility model, the first focus and the second focus correspond to one first focal length and one second respectively
Focal length, the first focal length and the second focal length are directly proportional to the length of plasma and are inversely proportional with width.
In an embodiment of the utility model, the system of double plasma generation high intensity THz wave adjustable in pitch
Further include a THz wave intensity detector for being arranged on silicon chip rear end.
In an embodiment of the utility model, the THz wave intensity detector is visited for pyroelectric detector or high Lay
Survey device.
In an embodiment of the utility model, the climbing device includes two sides metallic mirror.
In an embodiment of the utility model, the frequency of the chopper is 15~20Hz.
In an embodiment of the utility model, the speculum is speculum.
Double plasma adjustable in pitch provided by the utility model produces the system of high intensity THz wave with following
Advantage：
(1) by adjusting the spacing and symmetry axis between the two width Fresnel Lenses phase diagrams loaded in spatial light modulator
Rotation angle, and then spacing and spatial distribution between double plasma are controlled, compared with existing THz wave production method,
Not only increase the intensity of THz wave, additionally it is possible to be accurately controlled the energy and polarization state of THz wave, compensate at present
The blank in high intensity THz wave generation technology field, has stronger scientific research and actual application value；
(2) system structure is simple, build cost low, easy maintenance, high stability；
(3) the THz wave energy produced is relatively strong, spectrum is wider, beneficial to spectral measurement.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the knot for the system that double plasma adjustable in pitch provided by the utility model produces high intensity THz wave
Structure schematic diagram；
Fig. 2 is schematic diagram of the two width Fresnel Lenses phase diagrams on symmetry axis axisymmetricly；
Fig. 3 is the schematic diagram of climbing device；
Fig. 4 a are the single Fresnel Lenses phase diagram in the utility model；
Spacing is 60 microns of Fresnel Lenses phase diagram centered on Fig. 4 b；
Fig. 5 is between spacing and two/individual plasma between two plasmas that 1300nm laser produces
The graph of a relation of Terahertz energy ratio；
Fig. 6 is between spacing and two/individual plasma between two plasmas that 1550nm laser produces
The graph of a relation of Terahertz energy ratio.
Description of reference numerals：1- lasers；2- photoparametric amplifiers；3- choppers；4- climbing devices；5- laser beam expanders；
6- spatial light modulators；7- speculums；8-BBO crystal；The first off-axis parabolic mirrors of 9-；The second off axis paraboloid mirrors of 10- are anti-
Penetrate mirror；11- filter plates；12- silicon chips；13- THz wave intensity detectors；A, B- Fresnel Lenses phase diagram；L- symmetry axis.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of making the creative labor
All other embodiments obtained, shall fall within the protection scope of the present invention.
Fig. 1 is the knot for the system that double plasma adjustable in pitch provided by the utility model produces high intensity THz wave
Structure schematic diagram, as shown in Figure 1, a kind of double plasma adjustable in pitch provided by the utility model produces high intensity THz wave
System include sequentially set along light path laser 1, photoparametric amplifier 2, chopper 3, climbing device 4, laser beam expander 5,
Spatial light modulator 6, speculum 7, bbo crystal 8, the first off-axis parabolic mirror 9, the second off-axis parabolic mirror 10,
Filter plate 11 and silicon chip 12, wherein,
The laser that 1 launch wavelength of laser is 800nm, polarization direction is vertical direction, afterwards by photoparametric amplifier 2
Output wavelength is the flashlight of 1300nm or 1550nm afterwards, and flashlight turns polarization direction after chopper 3, by climbing device 4
It is changed into horizontal direction, then spatial light modulator 6 is incident to after being expanded by laser beam expander 5, is loaded in spatial light modulator 6
There are two width Fresnel Lenses phase diagram A, B, two width Fresnel Lenses phase diagram A, B that there is the first focus and the second focus respectively,
To convert incident light into the light of the parallel focusing of two beams and be projected to speculum 7 and bbo crystal 8, projected via bbo crystal 8
Two light beams focus on excitation air in the first focus and the second focal point respectively and produce plasma, and then form Terahertz spoke
Source is penetrated, the THz wave of terahertz emission source transmitting is reflected via the first off-axis parabolic mirror 9 and the second off axis paraboloid mirror
Mirror 10 reflects again filtered wave plate 11 and silicon chip 12 successively, that is, obtains high intensity THz wave.
Laser 1 can use femtosecond laser amplifier, such as the femtosecond of Spectra-Physics companies of U.S. production to swash
Image intensifer Spitfire.
Fig. 4 a are the single Fresnel Lenses phase diagram in the utility model, and spacing is 60 microns of Fei Nie centered on Fig. 4 b
Your lens phase figure, the focal length in Fig. 4 a, Fig. 4 b is 160 millimeters.
In the utility model, as shown in Figure 1, the spacing between two plasmas is d, two width Fresnel Lenses phase diagrams
A, the spacing d between the spacing between B and two plasmas is equal, therefore, can be by controlling two width Fresnel Lenses phases
The spacing between two plasmas of spacing and then control between bitmap A, B.In addition, as shown in Fig. 2, two width Fresnel Lenses
Phase diagram A, B on a symmetry axis L axisymmetricly, two Fresnel Lenses phase diagram center O1、O2Spacing be d, and two centers
Line is vertical with symmetry axis L, focus at this time formation two Plasma Centers line with symmetry axis L it is suitable/counterclockwise
Rotate and rotate same direction and same angle.It should be noted that mentioned in the utility model it is suitable/should be equal counterclockwise
Against optical path direction observation or it is to be observed along optical path direction.
In the utility model, the first focus and the second focus correspond to one first focal length and one second focal length respectively, and first
Focal length and the second focal length are respectively the optical path distance between 6 to two plasmas of spatial light modulator, in the utility model,
As spatial light modulator 6 is to the optical path distance of speculum 7, the optical path distance and bbo crystal 8 of speculum 7 to bbo crystal 8
The sum of optical path distance three to plasma, the first focal length and the second focal length it is directly proportional to the length of plasma and with width
Degree is inversely proportional.
As shown in Figure 1, double plasma generation high intensity THz wave adjustable in pitch provided by the utility model is
System can further include a THz wave intensity detector 13 for being arranged on 12 rear end of silicon chip, THz wave intensity detector
13 can be pyroelectric detector or Golay detector.
Fig. 3 is the schematic diagram of climbing device, as shown in figure 3, climbing device 4 includes two sides metallic mirror M1, M2, incident light is
Polarization direction is the laser of vertical (z-axis), the speculum M1 by a face optical axis direction and x directions into 45 degree of angles, and laser is anti-
Z directions are incident upon, by the second face optical axis direction and y-axis into 45 degree of speculum M2, the light beam after reflection is propagated in the y-direction, partially
The direction that shakes is horizontal (x-axis).
The frequency of the chopper 3 used in the utility model can be between 15~20Hz, also can be according to actual needs
The chopper of other specification is selected, the utility model is not limited.Speculum 7 can select speculum.
Fig. 5 is between spacing and two/individual plasma between two plasmas that 1300nm laser produces
The graph of a relation of Terahertz energy ratio, as shown in figure 5, when the spacing between two plasmas is respectively 0 micron, 20 microns, 40
When micron, 60 microns and 80 microns, corresponding Terahertz energy ratio is respectively 1,0.99,1.45,0.15,0.14.The pitch
" 0 " represents the situation using single Fresnel Lenses phase diagram.As it can be seen that when optical maser wavelength is 1300nm, two grades of control from
Spacing between daughter is 40 microns, and obtained Terahertz energy is maximum, and Terahertz energy at this time is about that spacing is single when being 0
1.45 times of Terahertz energy produced by Fresnel Lenses phase diagram.
Fig. 6 is between spacing and two/individual plasma between two plasmas that 1550nm laser produces
The graph of a relation of Terahertz energy ratio, as shown in fig. 6, when the spacing between two plasmas is respectively 0 micron, 20 microns, 40
Micron, 60 microns, 80 microns and at 120 microns, corresponding Terahertz energy ratio is respectively 1,1.01,2.28,2.3,0.81,
0.22.The pitch " 0 " represents the situation using single Fresnel Lenses phase diagram.As it can be seen that when optical maser wavelength is 1550nm,
It is 60 microns to control the spacing between two plasmas, and obtained Terahertz energy is maximum, and Terahertz energy at this time is about
2.3 times of Terahertz energy produced by single Fresnel Lenses phase diagram when spacing is 0.
As it can be seen that in the utility model, when the spacing between only two width Fresnel Lenses phase diagram A, B changes
(line at two Fresnel Lenses phase diagram centers is not as symmetry axis L rotates), the polarization state of THz wave is not sent out at this time
Changing, Terahertz energy can change with the spacing between two width Fresnel Lenses phase diagram A, B, and when two width
Spacing between Fresnel Lenses phase diagram A, B obtains a Terahertz Energy maximum value when reaching certain value.
In addition, under different optical maser wavelengths, when Terahertz energy is maximum between corresponding two width Fresnel Lenses phase diagram A, B
Spacing it is different, this spacing increases with the increase of wavelength.
(the two width Fresnel Lenses when the line at only two Fresnel Lenses phase diagram centers is rotated with symmetry axis L
Spacing between phase diagram A, B does not change), the energy of THz wave does not change at this time, the polarization state of THz wave with
The direction of corresponding two plasma lines and change, polarization direction is parallel with two plasma line directions.
Double plasma adjustable in pitch provided by the utility model produces the system of high intensity THz wave with following
Advantage：
(1) by adjusting the spacing and symmetry axis between the two width Fresnel Lenses phase diagrams loaded in spatial light modulator
Rotation angle, and then spacing and spatial distribution between double plasma are controlled, compared with existing THz wave production method,
Not only increase the intensity of THz wave, additionally it is possible to be accurately controlled the energy and polarization state of THz wave, compensate at present
The blank in high intensity THz wave generation technology field, has stronger scientific research and actual application value；
(2) system structure is simple, build cost low, easy maintenance, high stability；
(3) the THz wave energy produced is relatively strong, spectrum is wider, beneficial to spectral measurement.
One of ordinary skill in the art will appreciate that：Attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Flow is not necessarily implemented necessary to the utility model.
One of ordinary skill in the art will appreciate that：The module in device in embodiment can describe to divide according to embodiment
It is distributed in the device of embodiment, respective change can also be carried out and be disposed other than in one or more devices of the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：
It can still modify the technical solution described in previous embodiment, or which part technical characteristic is equal
Replace；And these modifications or replacement, the essence of appropriate technical solution is departed from the utility model embodiment technical solution
Spirit and scope.
Claims (9)
1. the system that a kind of double plasma adjustable in pitch produces high intensity THz wave, it is characterised in that including along light path
The laser that sequentially sets, photoparametric amplifier, chopper, climbing device, laser beam expander, spatial light modulator, speculum,
Bbo crystal, the first off-axis parabolic mirror, the second off-axis parabolic mirror, filter plate and silicon chip, wherein,
The laser that laser emission wavelength is 800nm, polarization direction is vertical direction, exports after photoparametric amplifier afterwards
Wavelength is the flashlight of 1300nm or 1550nm, and polarization direction is changed into level by flashlight after chopper, by climbing device
Direction, then spatial light modulator is incident to after being expanded by laser beam expander, two width phenanthrene alunites are mounted with spatial light modulator
That lens phase figure, two width Fresnel Lenses phase diagrams have the first focus and the second focus respectively, to convert incident light into
The light of the parallel focusing of two beams is simultaneously projected to speculum and bbo crystal, and the two light beams projected via bbo crystal are respectively first
Focus and the second focal point focus on excitation air and produce plasma, and then form terahertz emission source, terahertz emission source hair
The THz wave penetrated is filtered successively again via the first off-axis parabolic mirror and the reflection of the second off-axis parabolic mirror
Piece and silicon chip, that is, obtain high intensity THz wave.
2. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
It is, the spacing between two width Fresnel Lenses phase diagrams is equal with the spacing between two plasmas.
3. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
Be, two width Fresnel Lenses phase diagrams on a symmetry axis axisymmetricly, the line and symmetry axis of two Plasma Centers
Vertically, the line of two Plasma Centers rotates same direction and same angle with suitable/counterclockwise rotation of symmetry axis
Degree.
4. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
Be, the first focus and the second focus correspond to one first focal length and one second focal length respectively, the first focal length and the second focal length with etc.
The length of gas ions is directly proportional and is inversely proportional with width.
5. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
It is, further includes a THz wave intensity detector for being arranged on silicon chip rear end.
6. the system that double plasma adjustable in pitch according to claim 5 produces high intensity THz wave, its feature
It is, the THz wave intensity detector is pyroelectric detector or Golay detector.
7. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
It is, the climbing device includes two sides metallic mirror.
8. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
It is, the frequency of the chopper is 15~20Hz.
9. the system that double plasma adjustable in pitch according to claim 1 produces high intensity THz wave, its feature
It is, the speculum is speculum.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611755A (en) * | 2017-10-13 | 2018-01-19 | 首都师范大学 | The system and method that the adjustable double plasma of spacing produces high intensity THz wave |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611755A (en) * | 2017-10-13 | 2018-01-19 | 首都师范大学 | The system and method that the adjustable double plasma of spacing produces high intensity THz wave |
| CN107611755B (en) * | 2017-10-13 | 2024-02-23 | 首都师范大学 | System and method for generating high-intensity terahertz waves by double plasmas with adjustable spacing |
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