CN207530293U - A kind of system that THz wave is generated using special laser beam - Google Patents
A kind of system that THz wave is generated using special laser beam Download PDFInfo
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- CN207530293U CN207530293U CN201721367531.XU CN201721367531U CN207530293U CN 207530293 U CN207530293 U CN 207530293U CN 201721367531 U CN201721367531 U CN 201721367531U CN 207530293 U CN207530293 U CN 207530293U
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Abstract
The utility model discloses a kind of systems that THz wave is generated using special laser beam, this is included using the system that special laser beam generates THz wave：Special beam generated device, for generating special light beam；THz wave generation device, including the lens and a bbo crystal being mutually parallel, special light beam generates THz wave after normal transmission lens and bbo crystal successively.Compared with Gaussian beam, the special light beam in the utility model can generate respective change in the plasma formed after lens focus, so that capacity usage ratio higher, the THz wave energy of generation is stronger.System structure provided by the utility model using special laser beam generation THz wave is simple, easily safeguards, high stability, the THz wave of different types of special light beam and varying strength can be generated according to actual needs, the blank in current high intensity THz wave generation technology field is compensated for, there is stronger scientific research and actual application value.
Description
Technical field
The utility model is related to THz wave technologies and special light beam field, are flown in particular to a kind of using special
The system that second excitation laser beam air plasma generates high intensity THz wave.
Background technology
In recent years, with the maturation of spatial light modulation technology, special light beam field rapidly develops.Since special light beam has
Different from the physical characteristic of Gaussian beam so that the fields such as special light beam is taken the photograph in light, is imaged, surface plasma are widely used.
Ultrashort laser pulse is focused in surrounding air to the technology for directly generating THz wave, causes people in recent years
Extensive concern, this method (can several kilometers remote) can generate THz wave a long way off, and application prospect is very fine.It is although this
The method for generating THz wave has lot of advantages, still, since this mode generates the energy utilization efficiency ratio of THz wave
Relatively low, THz wave mechanism of production can not meet people's demand getting across completely, people it is urgent want to find can
The method for improving the energy utilization efficiency of THz wave.For this purpose, researchers have done many work this side up, pass through
Change the wavelength of laser, imitated using all multi-methods such as two-color fields, applied bias electric field, magnetic fields with enhancing the generation of THz wave
Rate still, there is not yet the technology of the generation efficiency using special light beam enhancing THz wave at present.
Utility model content
The utility model provides a kind of system that THz wave is generated using special laser beam, utilizes special femtosecond laser
Beam excitation air plasma generates high intensity THz wave, and can improve the energy utilization efficiency of THz wave.
In order to achieve the above objectives, the utility model, which provides, a kind of generate THz wave using special laser beam and is
System, including：
Special beam generated device, for generating special light beam；
THz wave generation device, including the lens and a bbo crystal being mutually parallel, the special light beam is vertical successively
THz wave is generated after transmiting the lens and the bbo crystal.
In one embodiment of the utility model, the special beam generated device includes being set in turn in light path
Laser, photoparametric amplifier, chopper, speculum group, beam expanding lens and light beam changeable device, the laser emit a Gauss
Light beam, the Gaussian beam become the Gaussian beam that polarization direction is vertical direction, polarization after the photoparametric amplifier
Direction is that the Gaussian beam of vertical direction by becoming polarization direction using the speculum group after chopper is level side
To Gaussian beam, polarization direction is incident to institute after the beam expanding lens expands for the Gaussian beam of horizontal direction with low-angle
Light beam changeable device is stated, the light beam changeable device exports special light beam after being modulated to incident beam.
In one embodiment of the utility model, the special light beam is zero-order Bessel light beam, high-order Bezier light
Beam, one-dimensional Airy beam, two-dimentional Airy beam, round Airy beam, rectangular Airy beam, vortex beams, Cosine beam,
Mathieu light beams or parabolic Line beam.
In one embodiment of the utility model, the system for generating THz wave using special laser beam further includes one
THz wave detection device is used to detect the intensity of the THz wave, including the first off-axis parabolic mirror, silicon chip,
Second off-axis parabolic mirror, filter plate and THz wave intensity detector, the first off-axis parabolic mirror is by Terahertz
Wave converges to form a collimated light beam, which is projected to the second off axis paraboloid mirror reflection after silicon chip filtering
Mirror is incident to the THz wave intensity detector after being filtered later using the filter plate.
In one embodiment of the utility model, the light beam changeable device is phase type spatial light modulator, wherein
Kinoform is pre-loaded with, to export special light beam or the light beam changeable device after being modulated to incident beam as liquid
Brilliant phase-plate.
In one embodiment of the utility model, the laser is femtosecond laser amplifier.
In one embodiment of the utility model, the frequency of the chopper is 15~20Hz.
In one embodiment of the utility model, the material of the lens is quartz, and the speculum is speculum.
In one embodiment of the utility model, the THz wave intensity detector is pyroelectric detector or Gao Lai
Detector.
The system provided by the utility model for generating THz wave using special laser beam utilizes special femtosecond laser light
Shu Jifa air plasmas generate high intensity THz wave, and can enhance the generation efficiency of THz wave, Advantageous effect
Fruit is as follows：
(1) compared with Gaussian beam, the special light beam in the utility model is in the plasma formed after lens focus
Know from experience and generate respective change, so that capacity usage ratio higher, the THz wave energy of generation is stronger.Such as：
Bessel beam, Airy beam, Cosine beam, Mathieu light beams and parabolic Line beam belong to Beams,
Wherein, the Beams solution under bessel beam Correspondent cy linder coordinate system, Airy beam correspond to one of paraxial diffraction equation
Salt free ligands particular solution, Cosine beam correspond to the Beams solution under rectangular coordinate system, and Mathieu light beams are corresponded under elliptical coordinate system
Beams solution, parabolic Line beam corresponds to the Beams solution under parabolic cylindrical coordinate.Since they have salt free ligands
Characteristic, so light beam can be caused to focus on, the plasma to be formed is longer, so as to which the capacity usage ratio of system is promoted one
Magnitude；
Vortex beams are a kind of hollow beams, and central light strength is almost nil, and the air of special construction can be generated after focusing
Plasma.
Plasma form that can also be as needed of the invention calculates loading on phase type spatial light modulator
Kinoform produces corresponding liquid crystal phase-plate, so as to obtain the air plasma of required form.Different types of spy
Energy density of plasma, form and the space structure that different light beam focus air is formed can all generate corresponding variation, so as to
The utility model can be further used for studying influence of the plasma shape to generating THz wave.
(2) system structure provided by the utility model that THz wave is generated using special laser beam simply, is easily tieed up
Shield, high stability can generate the THz wave of different types of special light beam and varying strength, more according to actual needs
The blank in current high intensity THz wave generation technology field has been mended, there is stronger scientific research and actual application value.
(3) the THz wave energy that the utility model generates is relatively strong, spectrum is wider, conducive to spectral measurement.
Description of the drawings
It 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, the accompanying drawings in the following description is 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, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the schematic diagram of the system provided by the utility model that THz wave is generated using special laser beam；
Fig. 2 a~Fig. 2 d are showing for kinoform pre-loaded when generating special light beam using phase type spatial light modulator
It is intended to；
Fig. 3 is to generate Airy beam using phase type spatial light modulator air plasma is excited to generate high intensity terahertz
Hereby wave generates the THz wave intensity rate of THz wave therebetween with wave with gauss laser beam excitation air plasma
The schematic diagram of long variation；
Fig. 4 is the schematic diagram of speculum group.
Reference sign：The special beam generated devices of A-；B- THz wave generation devices；C- THz waves detection dress
It puts；1- lasers；2- photoparametric amplifiers；3- choppers；4- speculum groups；5- beam expanding lens；6- light beam changeable devices；7- reflects
Mirror；8- lens；9-BBO crystal；The first off-axis parabolic mirrors of 10-；11- silicon chips；The second off-axis parabolic mirrors of 12-；
13- filter plates；14- THz wave intensity detectors.
Specific 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
It clearly and completely describes, 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.
The utility model provides a kind of system that THz wave is generated using special laser beam, by changing light beam class
Type improves THz wave generation efficiency.Compared to the gauss laser beam used in general experiment, special light beam focus air shape
Into energy density of plasma, form and space structure can all generate corresponding variation.
Schematic diagrames of the Fig. 1 for the system provided by the utility model that THz wave is generated using special laser beam, such as Fig. 1
It is shown, including special beam generated device A and THz wave generation device B.
For special beam generated device A for generating special light beam, the special light beam in the present embodiment can be zeroth order shellfish plug
That light beam, high-order bessel beam, one-dimensional Airy beam, two-dimentional Airy beam, round Airy beam, rectangular Airy beam, whirlpool
Optically-active beam, Cosine beam, Mathieu light beams or parabolic Line beam.
As shown in Figure 1, special beam generated device A includes the laser 1, the photoparametric amplifier that are set in turn in light path
2nd, chopper 3, speculum group 4, beam expanding lens 5 and light beam changeable device 6, laser 1 emit a Gaussian beam, and Gaussian beam is passed through
Become the Gaussian beam that polarization direction is vertical direction after photoparametric amplifier 2, wavelength is also changed at this time, polarization direction
Gaussian beam for vertical direction using speculum group 4 after chopper 3 by becoming the height that polarization direction is horizontal direction
This light beam, polarization direction are incident to for the Gaussian beam of horizontal direction after beam expanding lens 5 expands (collimator and extender) with low-angle
Light beam changeable device 6, light beam changeable device 6 export special light beam after being modulated to incident beam.Wherein, light beam changeable device
6 can be phase type spatial light modulator, special to export after being modulated to incident beam wherein be pre-loaded with kinoform
Light beam or light beam changeable device 6 are liquid crystal phase-plate.Phase type spatial light modulator has that efficient, speed is fast, kinoform
The advantages that easy to make, therefore be highly suitable to be applied in the utility model.When light beam changeable device 6 is phase type spatial light tune
During device or liquid crystal phase-plate processed, how to obtain what above-mentioned various special light beams were known to those skilled in the art, herein not
It gives and repeating.In addition, every special beam generated device that can generate above-mentioned special light beam can be applied to the utility model
In, it is not limited with the special beam generated device A shown in Fig. 1.
In this present embodiment, laser 1 for example launches the laser that wavelength is 800nm, by 2 postwave of photoparametric amplifier
The long laser for becoming 1200~1600nm.In other embodiments, the wavelength of laser can be changed according to actual needs.
Fig. 2 a~Fig. 2 d are showing for kinoform pre-loaded when generating special light beam using phase type spatial light modulator
It is intended to, Fig. 2 a are the kinoforms generated needed for round Airy beam, and Fig. 2 b are the kinoforms generated needed for rectangular Airy beam, are schemed
2c is the kinoform generated needed for zero-order Bessel light beam, and Fig. 2 d are the kinoforms generated needed for single order vortex beams.Due to spy
Different light beam type is various, each special light beam can obtain different kinoforms by changing different parameters, and details are not described herein.
As shown in Figure 1, THz wave generation device B includes the lens 8 and a bbo crystal 9 that are mutually parallel, special light beam
THz wave is generated after normal transmission lens 8 and bbo crystal 9 successively, wherein, lens 8 converge special light beam, using
Air is excited to generate plasma after bbo crystal 9 and generate terahertz radiation source.
Fig. 4 is the schematic diagram of speculum group, as shown in figure 4, speculum group 4 includes two sides metallic mirror M1, M2, it is incident
Just polarization direction is the laser of vertical (z-axis), by a face optical axis direction and x directions into the speculum M1 at 45 degree of angles, will be swashed
Light reflection is to z directions, and by the second face optical axis direction and y-axis into 45 degree of speculum M2, the light beam after reflection passes in the y-direction
It broadcasts, polarization direction level (x-axis).
The present embodiment can further include a THz wave detection device C, as shown in Figure 1, it is used to detect terahertz
The hereby intensity of wave, including the first off-axis parabolic mirror 10, silicon chip 11, the second off-axis parabolic mirror 12, filter plate 13
With THz wave intensity detector 14, the first off-axis parabolic mirror 10 converges THz wave to form a branch of collimated light beam,
The collimated light beam is projected to the second off-axis parabolic mirror 12 after the filtering of silicon chip 11, is filtered later using filter plate 13
After be incident to THz wave intensity detector 14.
In this present embodiment, laser 1 for example can be femtosecond laser amplifier, the frequency of chopper 4 can be 15~
20Hz, the material of lens 8 is preferably quartz, this is because quartz is to the laser in 800nm and 1200-1600nm wave-length coverages
Transmitance it is higher, the intensity for the THz wave that terahertz emission source radiation goes out can be improved.Speculum group 4 and speculum 7 compared with
Good is speculum, to improve the albedo to the wave-length coverage laser.THz wave intensity detector 14 can be pyroelectricity
Detector or Golay detector.
Fig. 3 is to generate Airy beam using phase type spatial light modulator air plasma is excited to generate high intensity terahertz
Hereby wave generates the THz wave intensity rate of THz wave therebetween with wave with gauss laser beam excitation air plasma
The schematic diagram of long variation.Since the position of bbo crystal and incident angle are very big to the influence for generating THz wave, in order to exclude
Influence of 9 position of bbo crystal to final result, using wavelength as 1550nm, the femtosecond laser of 100mW power generates THz wave and is
Standard adjusts position and the laser incident angle of 9 distance focal point of bbo crystal, finds the terahertz wave signal of energy maximum, and will
9 position of bbo crystal is fixed, and THz wave intensity rate can reach more than 3 in above-mentioned two situations, this is existing using high
This light beam generation THz wave system institute is inaccessiable, and therefore, the utility model has filled up special light beam and generated high intensity too
Hertz wave generates the technological gap in field, has stronger scientific research and actual application value.It is provided by the utility model to use spy
The system that different laser beam generates THz wave generates high intensity too using special femtosecond laser beam excitation air plasma
Hertz wave, and the generation efficiency of THz wave can be enhanced, advantageous effects are as follows：
(1) compared with Gaussian beam, the special light beam in the utility model is in the plasma formed after lens focus
Know from experience and generate respective change, so that capacity usage ratio higher, the THz wave energy of generation is stronger.Such as：
Bessel beam, Airy beam, Cosine beam, Mathieu light beams and parabolic Line beam belong to Beams,
Wherein, the Beams solution under bessel beam Correspondent cy linder coordinate system, Airy beam correspond to one of paraxial diffraction equation
Salt free ligands particular solution, Cosine beam correspond to the Beams solution under rectangular coordinate system, and Mathieu light beams are corresponded under elliptical coordinate system
Beams solution, parabolic Line beam corresponds to the Beams solution under parabolic cylindrical coordinate.Since they have salt free ligands
Characteristic, so light beam can be caused to focus on, the plasma to be formed is longer, so as to which the capacity usage ratio of system is promoted one
Magnitude；
Vortex beams are a kind of hollow beams, and central light strength is almost nil, and the air of special construction can be generated after focusing
Plasma.
Plasma form that can also be as needed of the invention calculates loading on phase type spatial light modulator
Kinoform produces corresponding liquid crystal phase-plate, so as to obtain the air plasma of required form.Different types of spy
Energy density of plasma, form and the space structure that different light beam focus air is formed can all generate corresponding variation, so as to
The utility model can be further used for studying influence of the plasma shape to generating THz wave.
(2) system structure provided by the utility model that THz wave is generated using special laser beam simply, is easily tieed up
Shield, high stability can generate the THz wave of different types of special light beam and varying strength, more according to actual needs
The blank in current high intensity THz wave generation technology field has been mended, there is stronger scientific research and actual application value.
(3) the THz wave energy that the utility model generates is relatively strong, spectrum is wider, conducive 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 located in one or more devices different from 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 still can modify to the technical solution recorded in previous embodiment or which part technical characteristic is equal
It replaces；And these modifications or replacement, the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (8)
1. a kind of system that THz wave is generated using special laser beam, which is characterized in that including：
Special beam generated device, for generating special light beam；
THz wave generation device, including the lens and a bbo crystal being mutually parallel, special light beam normal transmission successively
THz wave is generated after the lens and the bbo crystal；
Wherein, the special light beam is zero-order Bessel light beam, high-order bessel beam, one-dimensional Airy beam, two-dimentional Airy light
Beam, round Airy beam, rectangular Airy beam, vortex beams, Cosine beam, Mathieu light beams or parabolic Line beam.
2. the system according to claim 1 that THz wave is generated using special laser beam, which is characterized in that the spy
Different beam generated device includes the laser being set in turn in light path, photoparametric amplifier, chopper, speculum group, expands
Mirror and light beam changeable device, the laser emit a branch of Gaussian beam, and the Gaussian beam passes through the photoparametric amplifier
Become the Gaussian beam that polarization direction is vertical direction afterwards, polarization direction is passed through for the Gaussian beam of vertical direction after chopper
Become the Gaussian beam that polarization direction is horizontal direction using the speculum group, polarization direction is the Gauss light of horizontal direction
Beam is incident to the light beam changeable device after the beam expanding lens expands with low-angle, and the light beam changeable device is to incident light
Beam exports special light beam after being modulated.
3. the system according to claim 1 that THz wave is generated using special laser beam, which is characterized in that further include
One THz wave detection device is used to detect the intensity of the THz wave, including the first off-axis parabolic mirror, silicon
Piece, the second off-axis parabolic mirror, filter plate and THz wave intensity detector, the first off-axis parabolic mirror is by terahertz
Hereby wave converges to form a branch of collimated light beam, which is projected to second off axis paraboloid mirror after silicon chip filtering
Speculum is incident to the THz wave intensity detector after being filtered later using the filter plate.
4. the system according to claim 2 that THz wave is generated using special laser beam, which is characterized in that the light
Beam changeable device is phase type spatial light modulator, wherein kinoform is pre-loaded with, it is rear defeated to be modulated to incident beam
It is liquid crystal phase-plate to go out special light beam or the light beam changeable device.
5. the system according to claim 2 that THz wave is generated using special laser beam, which is characterized in that described to swash
Light device is femtosecond laser amplifier.
6. the system according to claim 2 that THz wave is generated using special laser beam, which is characterized in that described to cut
The frequency of wave device is 15~20Hz.
7. the system according to claim 2 that THz wave is generated using special laser beam, which is characterized in that described
The material of mirror is quartz, and the speculum is speculum.
8. it is according to claim 3 using special laser beam generate THz wave system, which is characterized in that it is described too
Hertz wave intensity detector is pyroelectric detector or Golay detector.
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| CN201721367531.XU CN207530293U (en) | 2017-10-23 | 2017-10-23 | A kind of system that THz wave is generated using special laser beam |
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| CN201721367531.XU CN207530293U (en) | 2017-10-23 | 2017-10-23 | A kind of system that THz wave is generated using special laser beam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591666A (en) * | 2017-10-23 | 2018-01-16 | 首都师范大学 | A kind of system and method that THz wave is produced using special laser beam |
| CN108923227A (en) * | 2018-07-23 | 2018-11-30 | 中国科学院上海光学精密机械研究所 | A kind of femtosecond vortex pulse generating device |
| CN111239882A (en) * | 2020-01-15 | 2020-06-05 | 南京大学 | Terahertz Bessel beam generator, preparation method and generation system |
-
2017
- 2017-10-23 CN CN201721367531.XU patent/CN207530293U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591666A (en) * | 2017-10-23 | 2018-01-16 | 首都师范大学 | A kind of system and method that THz wave is produced using special laser beam |
| CN107591666B (en) * | 2017-10-23 | 2023-04-18 | 首都师范大学 | System and method for generating terahertz waves by using special laser beams |
| CN108923227A (en) * | 2018-07-23 | 2018-11-30 | 中国科学院上海光学精密机械研究所 | A kind of femtosecond vortex pulse generating device |
| CN111239882A (en) * | 2020-01-15 | 2020-06-05 | 南京大学 | Terahertz Bessel beam generator, preparation method and generation system |
| CN111239882B (en) * | 2020-01-15 | 2021-09-28 | 南京大学 | Terahertz Bessel beam generator, preparation method and generation system |
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