CN106483096A - The system and method that laser excitation air plasma produces high intensity THz wave - Google Patents
The system and method that laser excitation air plasma produces high intensity THz wave Download PDFInfo
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- 230000005284 excitation Effects 0.000 title claims abstract description 31
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- 230000010287 polarization Effects 0.000 claims abstract description 23
- 238000004581 coalescence Methods 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 22
- 239000010703 silicon Substances 0.000 claims description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 21
- 239000011521 glass Substances 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000011835 investigation Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
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- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
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- 230000001419 dependent effect Effects 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
Abstract
The invention discloses the system and method that a kind of laser excitation air plasma produces high intensity THz wave, this system includes：Laser instrument、Chopper、Spectroscope、Photoparametric amplifier、Reflecting mirror、/ 2nd wave plates、First lens、Second lens and dichroic mirror，The laser light splitting of the 800nm that laser instrument is launched by spectroscope is the first light beam and the second light beam，First light beam output wavelength after photoparametric amplifier is the flashlight of 1200nm，After the flashlight of this 1200nm reflects through reflecting mirror and assembles through the first lens, warp is transmitted by dichroic mirror，The polarization direction of the second light beam that the wavelength being projected by spectroscope is 800nm by 1/2nd wave plates switchs to consistent with the polarization direction of 1200nm flashlight，Second light beam can coalescence reflect via dichroic mirror through the second lens afterwards，The flashlight of the 1200nm transmiting via dichroic mirror is excited the plasma of in the air after being assembled with the second light-beam collinear reflecting via dichroic mirror and produces a terahertz emission source.
Description
Technical field
The present invention relates to THz wave technology field, excite sky in particular to one kind using anharmonic wave femtosecond laser
The system and method that gas plasma produces high intensity THz wave.
Background technology
Ultrashort laser pulse is focused on the technology directly producing THz wave in surrounding air, causes people in recent years
Extensive concern, the method (can several kilometers remote) can produce THz wave, so application prospect is very fine a long way off.
When the ultrashort laser pulse of high-energy directly focuses in the air, the air of focal point can occur to ionize and be formed
Plasma, the pondermotive force thus being formed can make to form big density contrast between ionic charge and electron charge, and this
Plant the generation that Process of Charge Separation can lead to strong electromagnetic transients phenomenon, thus giving off Terahertz.
By introducing frequency-doubling crystal in ultrashort laser pulse, mixing fundamental wave ω and second harmonic 2 ω focuses on sky jointly
Gas and produce air plasma, the generation efficiency of Terahertz can be greatly improved.Produce THz wave main mechanism be
The third-order nonlinear optical effect of the ω of mixing and the generation of 2 ω light beams, i.e. four-wave mixing process in air plasma.Terahertz
Polarity and intensity completely by the relative position phase control of ω and 2 ω light interfasciculars.When optical pulse gross energy exceed air etc. from
During the threshold value that daughter is formed, the amplitude of THz electric field is directly proportional to the pulse energy of fundamental wave (linear relationship), with second harmonic
Pulse energy square root proportional.During four-wave mixing, when all light waves (ω light beam, 2 ω light beams and terahertz
Hereby ripple) polarization state all same when, the mixing best results of generation.
In conventional experiment, the general method focus air choosing fundamental wave mixing second harmonic produces plasma, thus
Produce THz wave.Focused on empty in general experiment using the second harmonic that the laser of 800nm mixes 400nm after frequency-doubling crystal
Gas produces Terahertz, but the THz wave intensity producing depends on the material behavior of frequency-doubling crystal, optical axis angle etc., and due to
Frequency-doubling crystal has damage threshold it is impossible to carry out pumping with very high power, therefore cannot meet use demand.
Content of the invention
The invention provides the system and method that a kind of laser excitation air plasma produces high intensity THz wave, with
Produce high intensity THz wave by mixing non-harmonic mode.
In order to achieve the above object, the invention provides a kind of laser excitation air plasma produces high intensity Terahertz
The system of ripple, it includes：Laser instrument, chopper, spectroscope, photoparametric amplifier, reflecting mirror, 1/2nd wave plates, first saturating
Mirror, the second lens and dichroic mirror, described light splitting piece is via described photoparametric amplifier, described reflecting mirror, described first lens
It is first path to described dichroic mirror, described light splitting piece is via described 1/2nd wave plates, described second lens to described two
It is the second path to Look mirror, described first path is equal with the second path optical path, wherein：
Described laser emission wavelength is the laser of 800nm, and described chopper carries out copped wave to the laser of 800nm, described
The laser light splitting of 800nm is the first light beam and the second light beam by spectroscope, and described first light beam is through described photoparametric amplifier
Output wavelength is the flashlight of 1200nm and polarization direction and the laser vertical of former 800nm afterwards, the flashlight of this 1200nm with
The laser of 800nm is anharmonic wave, and the flashlight of this 1200nm reflects and through described first lens convergence through described reflecting mirror
Transmit by by described dichroic mirror, the wavelength being projected by described spectroscope is the of 800nm by described 1/2nd wave plates
The polarization direction of two light beams switchs to consistent with the polarization direction of 1200nm flashlight, and the second light beam is through described second lens afterwards
Can coalescence reflect via described dichroic mirror, the flashlight of the 1200nm transmiting via described dichroic mirror and via described two
Excite the plasma of in the air after assembling to the second light-beam collinear that Look mirror reflects and produce a terahertz emission source.
In one embodiment of this invention, described laser instrument is femtosecond laser amplifier.
In one embodiment of this invention, the frequency of described chopper is 15-20Hz.
In one embodiment of this invention, the material of described first lens and described second lens is quartz.
In one embodiment of this invention, described reflecting mirror is speculum.
In one embodiment of this invention, the system of laser excitation air plasma generation high intensity THz wave is also wrapped
Include a THz wave strength investigation subsystem, described THz wave strength investigation subsystem includes the first off axis paraboloid mirror reflection
Mirror, filter plate, silicon chip, index glass, horizontal glass, the second off-axis parabolic mirror and THz wave intensity detector, wherein：
It is flat that the THz wave that described terahertz emission source produces is assembled formation one by described first off-axis parabolic mirror
Row light beam；
Described filter plate filters out the flashlight of the 1200nm being mingled with described collimated light beam and the laser of 800nm；
A part of THz wave transmits described silicon chip and forms the first wave beam, and another part THz wave is in described silicon chip table
Surface launching forms the second wave beam, and wherein, the propagation path of the first wave beam is：First multi-beam transmission is to described index glass, the first wave beam
Be reflected back described silicon chip surface and reflect in described silicon chip surface, the first multi-beam transmission anti-to described second off axis paraboloid mirror
Penetrate mirror and occur reflection and the first wave beam to be visited by described THz wave intensity on described second off-axis parabolic mirror surface
Survey device to receive, the propagation path of the second wave beam is：Second multi-beam transmission returns described silicon chip simultaneously to described horizontal glass, the second beams reflected
Transmitted through described silicon chip, the second multi-beam transmission extremely described second off-axis parabolic mirror and anti-in described second off axis paraboloid mirror
Penetrating mirror surface occurs reflection and the second wave beam to be received by described THz wave intensity detector；
Change the position of the described index glass optical path difference to adjust the first wave beam and the second wave beam, described THz wave intensity is visited
Survey device and auto-correlation processing is carried out to obtain the autocorrelogram in terahertz emission source to the first wave beam receiving and the second wave beam.
In one embodiment of this invention, described THz wave intensity detector is pyroelectric detector or high Lay detects
Device.
In one embodiment of this invention, the highest frequency in described terahertz emission source is 10THz.
Present invention also offers a kind of method that laser excitation air plasma produces high intensity THz wave, it includes
Following steps：
S1：Launch the laser that a wavelength is 800nm using a laser instrument；
S2：Using a spectroscope by the laser light splitting of 800nm be the first light beam and the second light beam；
S3：Make described first light beam output wavelength after a photoparametric amplifier be 1200nm and polarization direction with former
The flashlight of the laser vertical of 800nm；
S4：The flashlight that wavelength is 1200nm is made to assemble via one first lens after a reflecting mirror reflects again；
S5：Make the second light beam that wavelength is 800nm pass through 1/1st wave plate so that its polarization direction switch to
The polarization direction of 1200nm flashlight is consistent；
S6：The second light beam that wavelength is 800nm is made to assemble through one second lens；
S7：Through first lens assemble wavelength be 1200nm flashlight via a dichroic mirror transmission, through second
The wavelength that lens are assembled is that second light beam of 800nm reflects via this dichroic mirror, and the two-beam being projected by this dichroic mirror is altogether
Line excites the plasma of in the air after assembling and produces a terahertz emission source.
The present invention provide laser excitation air plasma produce high intensity THz wave system and method have with
Lower advantage：
(1) the laser excitation air plasma that the present invention provides produce high intensity THz wave system structure simple,
Build low cost, easily safeguard, stability higher, the THz wave of varying strength can be produced according to actual needs, compensate for
The blank in high intensity THz wave generation technology field, has stronger scientific research and actual application value at present.
(2) the laser excitation air plasma that the present invention provides produces the system and method generation of high intensity THz wave
THz wave energy is relatively strong, spectrum is wider, beneficial to spectral measurement.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
The structure of the system that Fig. 1 produces high intensity THz wave for the laser excitation air plasma that the present invention provides is shown
It is intended to；
The system that Fig. 2 produces high intensity THz wave for the laser excitation air plasma that the present invention provides produces too
The autocorrelogram in Hertzion radiation source；
The system that Fig. 3 produces high intensity THz wave for the laser excitation air plasma that the present invention provides produces too
The intensity of Hertz wave is with the scattergram of frequency.
Description of reference numerals：1- laser instrument；2- chopper；3- spectroscope；4- photoparametric amplifier；5- reflecting mirror；6- bis-
/ mono- wave plate；7- first lens；8- second lens；9- dichroic mirror；10- first off-axis parabolic mirror；11- filters
Piece；12- silicon chip；13- index glass；14- horizontal glass；15- second off-axis parabolic mirror；16- THz wave intensity detector.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not paying creative work
Embodiment, broadly falls into the scope of protection of the invention.
The structure of the system that Fig. 1 produces high intensity THz wave for the laser excitation air plasma that the present invention provides is shown
It is intended to, as shown in figure 1, a kind of laser excitation air plasma that the present invention provides produces the system bag of high intensity THz wave
Include：Laser instrument 1, chopper 2, spectroscope 3, photoparametric amplifier 4, reflecting mirror 5,1/2nd wave plates 6, the first lens 7, second
Lens 8 and dichroic mirror 9, light splitting piece 3 is first via photoparametric amplifier 4, reflecting mirror 5, the first lens 7 to dichroic mirror 9
Path, light splitting piece 3 is the second path, first path and the second tunnel via 1/2nd wave plates 6, the second lens 8 to dichroic mirror 9
Footpath equivalent optical path, wherein：
Laser instrument 1 launch wavelength is the laser of 800nm, and laser instrument 1 can adopt femtosecond laser amplifier, the such as U.S.
The femtosecond laser amplifier Spitfire that Spectra-Physics company produces, chopper 2 carries out copped wave to the laser of 800nm,
The frequency of chopper 2 can be 15-20Hz, but is not limited, also dependent on the chopper needing selection other specification, light splitting
The laser light splitting of 800nm is the first light beam and the second light beam by mirror 3, the first light beam output wavelength after photoparametric amplifier 4
For the flashlight of 1200nm and the laser vertical of polarization direction and former 800nm, the flashlight of this 1200nm and the laser of 800nm
For anharmonic wave, after the flashlight of this 1200nm reflects through reflecting mirror 5 and assembles through the first lens 7, warp is saturating by dichroic mirror 9
Project, 1/2nd wave plates 6 by the wavelength being projected by spectroscope 3 be 800nm the second light beam polarization direction switch to
The polarization direction of 1200nm flashlight is consistent, and the second light beam can coalescence reflect via dichroic mirror 9 through the second lens 8 afterwards,
After the flashlight of the 1200nm transmiting via dichroic mirror 9 is assembled with the second light-beam collinear reflecting via dichroic mirror 9
Excite the plasma of in the air and produce a terahertz emission source.
When first path is equal with the second path optical path, stronger THz wave can be produced, when first path and the
When two path optical path are unequal, the THz wave intensity of generation declines.
In addition, 1/2nd wave plates 6 in the second path can also be arranged in first path, with by wavelength as 1200nm
Flashlight polarization direction be adjusted to the laser for 800nm with wavelength polarization direction consistent.
The material of the first lens 7 in the present invention and the second lens 8 is preferably quartz, this be due to quartz to 800nm and
The transmitance of the laser of 12nm wavelength is higher, it is possible to increase the intensity of the THz wave that terahertz emission source radiation goes out.Reflecting mirror 5
Preferably speculum, to improve the reflectance to 1200nm wavelength laser.
As shown in figure 1, the system that laser excitation air plasma produces high intensity THz wave can also be wrapped further
Include a THz wave strength investigation subsystem (Fig. 1 right part), THz wave strength investigation subsystem includes first and throws from axle
Parabolic mirror 10, filter plate 11, silicon chip 12, index glass 13, horizontal glass 14, the second off-axis parabolic mirror 15 and THz wave are strong
Degree detector 16, wherein：
The THz wave that terahertz emission source produces is assembled and is formed a collimated light beam by the first off-axis parabolic mirror 10；
Filter plate 11 filters out the flashlight of the 1200nm being mingled with collimated light beam and the laser of 800nm；
A part of THz wave transmits silicon chip and forms the first wave beam, and another part THz wave is in silicon chip 12 surface emitting
Form the second wave beam, wherein, the propagation path of the first wave beam is：First multi-beam transmission is reflected back silicon to index glass 13, the first wave beam
Piece 12 surface and reflect on silicon chip 12 surface, the first multi-beam transmission to the second off-axis parabolic mirror 15 and second from
Axle parabolic mirror 15 surface occurs reflection and the first wave beam to be received by THz wave intensity detector 16, the second wave beam
Propagation path is：Second multi-beam transmission returns silicon chip 12 and transmitted through silicon chip 12, the second wave beam biography to horizontal glass 14, the second beams reflected
Transport to the second off-axis parabolic mirror 15 and on the second off-axis parabolic mirror 15 surface, reflection and the second wave beam occur
Received by THz wave intensity detector 16；
Wherein, THz wave intensity detector 16 can be pyroelectric detector or Golay detector.
The position (the four-headed arrow direction shown in along Fig. 1) changing index glass 13 is to adjust the light of the first wave beam and the second wave beam
Path difference, THz wave intensity detector 16 carries out auto-correlation processing to obtain terahertz to the first wave beam receiving and the second wave beam
The hereby autocorrelogram of radiation source, is illustrated in figure 2 the autocorrelogram in terahertz emission source, and abscissa postpones for position, that is,
First wave beam and the optical path difference of the second wave beam, when the optical path difference of the first wave beam and the second wave beam is zero namely first wave beam and second
During wave beam equivalent optical path, the terahertz wave signal maximum intensity that detects, when the light path of the first wave beam is more than the light of the second wave beam
When the light path of journey or the second wave beam is more than the light path of the first wave beam, the signal intensity of the THz wave detecting all decreases.
The system that the laser excitation air plasma that the present invention provides produces high intensity THz wave can be by changing
The intensity of the laser that laser instrument 1 sends obtains the THz wave of varying strength.
The system that Fig. 3 produces high intensity THz wave for the laser excitation air plasma that the present invention provides produces too
The intensity of Hertz wave is with the scattergram of frequency, as illustrated, the highest frequency in terahertz emission source can reach 10THz, this is
Existing THz wave generation system institute is inaccessiable, and therefore, the present invention has filled up high intensity THz wave and produced field
Technological gap, has stronger scientific research and actual application value.
Present invention also offers a kind of method that laser excitation air plasma produces high intensity THz wave, the method
It is to be realized using the system shown in Fig. 1, it comprises the following steps：
S1：Launch the laser that a wavelength is 800nm using a laser instrument；
S2：Using a spectroscope by the laser light splitting of 800nm be the first light beam and the second light beam；
S3：Make the first light beam output wavelength after a photoparametric amplifier be 1200nm and polarization direction with former
The flashlight of the laser vertical of 800nm；
S4：The flashlight that wavelength is 1200nm is made to assemble via one first lens after a reflecting mirror reflects again；
S5：Make the second light beam that wavelength is 800nm pass through 1/1st wave plate so that its polarization direction switch to
The polarization direction of 1200nm flashlight is consistent；
S6：The second light beam that wavelength is 800nm is made to assemble through one second lens；
S7：Through first lens assemble wavelength be 1200nm flashlight via a dichroic mirror transmission, through second
The wavelength that lens are assembled is that second light beam of 800nm reflects via this dichroic mirror, and the two-beam being projected by this dichroic mirror is altogether
Line excites the plasma of in the air after assembling and produces a terahertz emission source.
To sum up, the laser excitation air plasma that the present invention provides produces the system and method tool of high intensity THz wave
Have the advantage that：
(1) the laser excitation air plasma that the present invention provides produce high intensity THz wave system structure simple,
Build low cost, easily safeguard, stability higher, the THz wave of varying strength can be produced according to actual needs, compensate for
The blank in high intensity THz wave generation technology field, has stronger scientific research and actual application value at present.
(2) the laser excitation air plasma that the present invention provides produces the system and method generation of high intensity THz wave
THz wave energy is relatively strong, spectrum is wider, beneficial to spectral measurement.
One of ordinary skill in the art will appreciate that：Accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or
Flow process is not necessarily implemented necessary to the present invention.
One of ordinary skill in the art will appreciate that：The module in device in embodiment can be according to embodiment description point
It is distributed in the device of embodiment and be disposed other than in one or more devices of the present embodiment it is also possible to carry out respective change.On
The module stating embodiment can merge into a module it is also possible to be further split into multiple submodule.
Finally it should be noted that：Above example only in order to technical scheme to be described, is not intended to limit；Although
With reference to the foregoing embodiments the present invention is described in detail, it will be understood by those within the art that：It still may be used
To modify to the technical scheme described in previous embodiment, or equivalent is carried out to wherein some technical characteristics；And
These modifications or replacement, do not make the essence of appropriate technical solution depart from spirit and the model of embodiment of the present invention technical scheme
Enclose.
Claims (9)
1. a kind of laser excitation air plasma produces the system of high intensity THz wave it is characterised in that including：Laser
Device, chopper, spectroscope, photoparametric amplifier, reflecting mirror, 1/2nd wave plates, the first lens, the second lens and dichroic
Mirror, described light splitting piece is first via described photoparametric amplifier, described reflecting mirror, described first lens to described dichroic mirror
Path, described light splitting piece is the second path via described 1/2nd wave plates, described second lens to described dichroic mirror, described
First path is equal with the second path optical path, wherein：
Described laser emission wavelength is the laser of 800nm, and described chopper carries out copped wave, described light splitting to the laser of 800nm
The laser light splitting of 800nm is the first light beam and the second light beam by mirror, and described first light beam is defeated after described photoparametric amplifier
Going out wavelength is 1200nm and flashlight, the flashlight of this 1200nm and the 800nm of the laser vertical of polarization direction and former 800nm
Laser be anharmonic wave, the flashlight of this 1200nm reflect through described reflecting mirror and assembles through described first lens after warp by
Described dichroic mirror transmits, and the wavelength being projected by described spectroscope is second light beam of 800nm by described 1/2nd wave plates
Polarization direction switch to consistent with the polarization direction of 1200nm flashlight, the second light beam can coalescence through described second lens afterwards
Via described dichroic mirror reflection, the flashlight of the 1200nm transmiting via described dichroic mirror with via described dichroic mirror
The second light-beam collinear reflecting excites the plasma of in the air after assembling and produces a terahertz emission source.
2. laser excitation air plasma according to claim 1 produces the system of high intensity THz wave, its feature
It is, described laser instrument is femtosecond laser amplifier.
3. laser excitation air plasma according to claim 1 produces the system of high intensity THz wave, its feature
It is, the frequency of described chopper is 15-20Hz.
4. laser excitation air plasma according to claim 1 produces the system of high intensity THz wave, its feature
It is, the material of described first lens and described second lens is quartz.
5. laser excitation air plasma according to claim 1 produces the system of high intensity THz wave, its feature
It is, described reflecting mirror is speculum.
6. laser excitation air plasma according to claim 1 produces the system of high intensity THz wave, its feature
It is, also includes a THz wave strength investigation subsystem, described THz wave strength investigation subsystem includes first and throws from axle
Parabolic mirror, filter plate, silicon chip, index glass, horizontal glass, the second off-axis parabolic mirror and THz wave intensity detector, its
In：
The THz wave that described terahertz emission source produces is assembled and is formed a directional light by described first off-axis parabolic mirror
Bundle；
Described filter plate filters out the flashlight of the 1200nm being mingled with described collimated light beam and the laser of 800nm；
A part of THz wave transmits described silicon chip and forms the first wave beam, and another part THz wave is sent out in described silicon chip surface
Penetrate formation the second wave beam, wherein, the propagation path of the first wave beam is：First multi-beam transmission is to described index glass, the first beams reflected
Return described silicon chip surface and reflect in described silicon chip surface, the first multi-beam transmission extremely described second off-axis parabolic mirror
And there is reflection and the first wave beam by described THz wave intensity detector on described second off-axis parabolic mirror surface
Receive, the propagation path of the second wave beam is：Second multi-beam transmission returns described silicon chip transmission to described horizontal glass, the second beams reflected
Cross described silicon chip, the second multi-beam transmission extremely described second off-axis parabolic mirror and in described second off-axis parabolic mirror
Surface occurs reflection and the second wave beam to be received by described THz wave intensity detector；
Change the position of the described index glass optical path difference to adjust the first wave beam and the second wave beam, described THz wave intensity detector
Auto-correlation processing is carried out to obtain the autocorrelogram in terahertz emission source to the first wave beam receiving and the second wave beam.
7. laser excitation air plasma according to claim 6 produces the system of high intensity THz wave, its feature
It is, described THz wave intensity detector is pyroelectric detector or Golay detector.
8. the laser excitation air plasma according to claim 6 or 7 produces the system of high intensity THz wave, and it is special
Levy and be, the highest frequency in described terahertz emission source is 10THz.
9. a kind of laser excitation air plasma produces the method for high intensity THz wave it is characterised in that including following walking
Suddenly：
S1：Launch the laser that a wavelength is 800nm using a laser instrument；
S2：Using a spectroscope by the laser light splitting of 800nm be the first light beam and the second light beam；
S3：Make described first light beam output wavelength after a photoparametric amplifier be 1200nm and polarization direction with former
The flashlight of the laser vertical of 800nm；
S4：The flashlight that wavelength is 1200nm is made to assemble via one first lens after a reflecting mirror reflects again；
S5：The second light beam that wavelength is 800nm is made to pass through 1/1st wave plate, so that its polarization direction switchs to believe with 1200nm
The polarization direction of number light is consistent；
S6：The second light beam that wavelength is 800nm is made to assemble through one second lens；
S7：Through first lens assemble wavelength be 1200nm flashlight via a dichroic mirror transmission, through the second lens
The wavelength assembled is that second light beam of 800nm reflects via this dichroic mirror, collinearly can by the two-beam that this dichroic mirror projects
Excite the plasma of in the air after poly- and produce a terahertz emission source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611055826.3A CN106483096B (en) | 2016-11-25 | 2016-11-25 | System and method for generating high-intensity terahertz waves by exciting air plasmas through laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611055826.3A CN106483096B (en) | 2016-11-25 | 2016-11-25 | System and method for generating high-intensity terahertz waves by exciting air plasmas through laser |
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| Publication Number | Publication Date |
|---|---|
| CN106483096A true CN106483096A (en) | 2017-03-08 |
| CN106483096B CN106483096B (en) | 2023-04-25 |
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