CN111490437A - Device and method for inducing frequency-controllable microwave radiation by utilizing action of laser and antenna target - Google Patents
Device and method for inducing frequency-controllable microwave radiation by utilizing action of laser and antenna target Download PDFInfo
- Publication number
- CN111490437A CN111490437A CN202010293754.6A CN202010293754A CN111490437A CN 111490437 A CN111490437 A CN 111490437A CN 202010293754 A CN202010293754 A CN 202010293754A CN 111490437 A CN111490437 A CN 111490437A
- Authority
- CN
- China
- Prior art keywords
- microwave radiation
- antenna target
- target
- frequency
- metal
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/0007—Applications not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
Abstract
The invention provides a device for inducing frequency controllable microwave radiation by utilizing the action of laser and an antenna target, which comprises: a light source for outputting a laser beam; focusing optics for receiving and focusing the laser beam; a metal antenna target for receiving the focused laser beam at one end thereof and generating microwave radiation; a metal chamber for housing a light source, focusing optics, and a metal antenna target, which is electrically isolated from the metal antenna target by an insulating target stand; and a signal detection system for determining the microwave frequency; the microwave radiation frequency is controlled by determining the corresponding relation between the appearance characteristic or the intrinsic electrical characteristic of the metal antenna target and the frequency of the microwave radiation. The device is simple and easy to realize, can conveniently adjust the microwave radiation frequency, and can make the microwave radiation frequency concentrated in a higher frequency range, thereby avoiding the electronic equipment from being interfered so that the acquired signal is superimposed with strong electromagnetic noise and even damaging the electronic equipment.
Description
Technical Field
The invention relates to a device and a method for inducing frequency-controllable microwave radiation by utilizing the action of laser and an antenna target, belongs to the technical field of intense laser, has the advantages of simple device, easiness in realization, optical means driving, adjustability of radiation frequency and the like, and is expected to be applied to the technical fields of electromagnetic interference elimination, laser weapons and the like in laser fusion.
Background
The microwave radiation has the characteristics of wavelength, small transmission disturbance and the like, and is widely applied to the fields of radars, communication, high-power microwave weapons and the like; because it can produce local high heat effect to denature and coagulate protein to achieve the effect of cutting, it is also commonly used in the medical field of surgical operation.
The interaction of the strong laser and the solid target can generate a large amount of radiation from a radio frequency band of dozens of megahertz to a microwave band of hundreds of gigahertz, and the radiation intensity can reach hundreds of kV/m [ J.Phys.: Conf.Ser.,2010,244: 032001; rep.,2016,6:27889 ]. In the research of fusion realized by the interaction of strong laser and a solid target at present, the microwave radiation often causes the interference of electronic diagnosis equipment in the experiment, and the acquired signals are superimposed with strong electromagnetic noise, so that the accurate understanding of a researcher on the laser fusion process is directly influenced. In extreme cases, the electronic components in the diagnostic equipment can be temporarily disabled or burnt, which results in high experimental cost. Microwave radiation may be generated by electron escape, chamber oscillation, dipole radiation, oscillation of grounded metal structures, and the like. However, the existing experimental system is often disordered and coupled with various mechanisms, so that the spectral components of the microwave radiation are complex and difficult to characterize and predict, and the radiation intensity is difficult to control.
Disclosure of Invention
In order to solve the problem that the frequency of microwave radiation generated by the interaction of laser and a solid target is difficult to regulate, the invention provides a method for inducing frequency-controllable microwave radiation by utilizing the interaction of strong laser and an antenna target, and by setting the structure and the electrical characteristics of a target substance, a region capable of acting with the laser is still reserved on the antenna target, and the antenna target is isolated from other charged or grounded metal parts, so that the target material generates the microwave radiation with specific frequency. The device is simple and easy to realize, and can conveniently adjust the microwave radiation frequency. In one embodiment, it is an object to provide an apparatus and method that utilizes a laser to interact with an antenna target to generate microwave radiation, and that allows the frequency of the microwave radiation to be controlled by adjusting the size of the antenna target. In one embodiment, another object is to concentrate the frequency of the generated microwave radiation in a narrow frequency range, avoiding complex combinations of spectral components. In one embodiment, another object is to concentrate the generated microwave radiation frequency in a higher frequency range, thereby avoiding that the electronic equipment is disturbed such that the acquired signal is superimposed with strong electromagnetic noise, even damaging the electronic equipment. One or more of these objects or advantages may be addressed by the various embodiments of the invention as described below. It is to be understood that not necessarily all such objects or advantages may be achieved in accordance with any particular embodiment of the examples disclosed herein. Thus, examples disclosed herein may be implemented in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other advantages as may be taught or suggested herein.
"one embodiment" should be construed to include examples of the invention, which include features of the described embodiments. All features of the invention and embodiments of the invention described herein, including ranges and preferred ranges, may be combined in various ways within the scope of the invention, unless there is a specific reason for not combining the features. The advantages of the invention or embodiments thereof will be apparent to those skilled in the art from the following description.
To achieve the above object, according to one aspect of the present invention, there is provided an apparatus for inducing frequency controllable microwave radiation using laser and antenna target interaction, the apparatus comprising: a light source configured to output a laser beam; focusing optics configured to receive the laser beam and focus it; a metal antenna target configured to receive the focused laser beam at one end thereof, the focused laser beam interacting with the metal antenna target to generate microwave radiation; a metal chamber for housing the light source, focusing optics, and a metal antenna target, the metal chamber and the metal antenna target being electrically isolated by an insulating target mount; and a signal detection system configured to determine a frequency of the microwave radiation; and controlling the frequency of the microwave radiation by determining the corresponding relation between the appearance characteristic variable or the intrinsic electrical characteristic variable of the metal antenna target and the frequency of the microwave radiation.
In a specific embodiment, the controlling the frequency of the microwave radiation by determining the corresponding relationship between the characteristic variables of the external shape or the intrinsic electrical characteristic of the metal antenna target and the frequency of the microwave radiation includes setting the external shape of the metal antenna target to be a straight line shape, and controlling the frequency of the microwave radiation by controlling the length of the metal antenna target along the length direction.
Through the relation, the axial length of the antenna target can be set to be reduced to a proper length so as to generate higher-frequency microwave radiation frequency, and therefore a low-frequency microwave radiation frequency band, in the actual environment, of which the instrument and equipment are easy to be damaged by interference, is avoided.
In a specific embodiment, controlling the frequency of the microwave radiation comprises setting the metallic antenna target to a helical antenna target, and controlling the frequency of the microwave radiation by controlling a diameter and a number of turns of a current loop of the helical antenna target.
In a specific embodiment, controlling the frequency of the microwave radiation includes setting the metal antenna target to be a birdcage coil antenna target, and controlling the frequency of the microwave radiation by controlling a capacitance, an inductance, and a number of birdcage coil legs of the birdcage coil antenna target.
In a specific embodiment, controlling the frequency of the microwave radiation includes setting the metal antenna target to be a dipole variable-angle antenna target, and controlling the frequency of the microwave radiation by controlling a variable-angle curve profile of the dipole variable-angle antenna target. In a specific embodiment, an end face of one end of the metal antenna target for receiving the focused laser beam has a planar area on which the laser beam is focused. The set plane area can maximize the focusing intensity of the laser.
In a specific embodiment, the insulating target is in the shape of a bottom bracket with a bottom coupled to the metal chamber and a top coupled to the antenna target, or in the shape of a clamp with a top coupled to the metal chamber and a bottom coupled to the antenna target.
In a specific embodiment, the interior of the metal chamber is vacuum, and the metal chamber further comprises a vacuum cable adapter flange made of a non-metal material and configured to connect a signal detection system with the metal chamber. The vacuum metal cavity environment can be used for obtaining a more accurate measuring result in the scene of experiments like laser fusion and the like. In a specific embodiment, further comprising a faraday shield box, the signal detection system is arranged within the faraday shield box for avoiding direct coupling of the microwave radiation signal to the signal detection system. The Faraday shielding box can provide better clutter shielding in a scene with clutter in the surrounding environment, and further more accurate measurement results are obtained.
In a specific embodiment, the metal antenna target is made of one or a combination of copper, gold and silver.
In a specific embodiment, the laser is a femtosecond laser or other laser capable of generating femtosecond to nanosecond scale laser beams, wherein the laser focal spot focused by the off-axis parabolic mirror is 3 μm to 3mm in diameter; the laser wavelength range is one of ultraviolet light, visible light and infrared light; the laser repetition frequency ranges from 1Hz to 100 kHz; and optionally, the laser beam is a parallel pulsed laser beam.
According to another aspect of the present invention there is provided a method of inducing frequency controllable microwave radiation using any one of the apparatus described above, comprising the steps of:
step 1: selecting a metal antenna target with a shape characteristic variable or an intrinsic electrical characteristic variable;
step 2: microwave radiation is generated by the equipment, the frequency spectrum of the microwave radiation is analyzed by the signal detection system, and microwave radiation characteristic parameters of the metal antenna target are determined.
And step 3: and determining the appearance characteristic variable or the intrinsic electrical characteristic variable of the metal antenna target corresponding to the expected target microwave radiation characteristic parameter according to the relation between the appearance characteristic variable or the intrinsic electrical characteristic variable of the metal antenna target and the microwave radiation characteristic parameter.
Compared with the prior art, the invention has the advantages that the device and the method are provided, the device utilizes the action of laser and an antenna target to generate microwave radiation, and the frequency of the microwave radiation is controllable through induction, on one hand, the generated microwave radiation frequency is concentrated in a narrower frequency range, the occurrence of complex frequency spectrum component combination is avoided, on the other hand, more importantly, the generated microwave radiation frequency is concentrated in a higher frequency range, and therefore, the electronic equipment is prevented from being interfered, so that the acquired signal is superposed with strong electromagnetic noise, and even the electronic equipment is damaged.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of an apparatus for inducing frequency controllable microwave radiation using laser and antenna target interaction in accordance with the present invention;
FIG. 2 is a flow chart of an apparatus and method for inducing frequency controllable microwave radiation using laser and antenna target interaction in accordance with the present invention;
fig. 3 is a frequency spectrum diagram of microwave radiation frequency modulated by antenna targets with the sizes of 14cm and 28cm respectively obtained by the device and the method.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily drawn to scale with respect to the specific embodiments. The components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows: a device and a method for generating microwave radiation with controllable frequency by the action of a linear metal antenna target with the length of 14cm and 28cm and laser.
Fig. 1 shows a topology structure of a laser and antenna target interaction induced frequency controllable microwave radiation device according to a first embodiment of the present invention, which includes a femtosecond laser 1, an off-axis parabolic mirror 2, an antenna target 3, an insulating target frame 4, a probe antenna 5, a vacuum chamber 6, a vacuum cable adapter flange 7, an oscilloscope 8, a digital delay generator 9, and a faraday shield box 10. Wherein, the femtosecond laser 1 outputs parallel laser beams which are focused by the off-axis parabolic mirror 2 and then converged to the antenna target 3; the antenna target 3 is fixed on the insulating target frame 4; the detection antenna 5 is connected with an oscilloscope 8 through a vacuum cable adapter flange 7; the digital time delay generator 9 is connected with the femtosecond laser 1 and receives a trigger signal input by the femtosecond laser 1; the oscilloscope 8 is connected with the digital delay trigger 9 and receives a trigger signal input by the digital delay trigger; the off-axis parabolic mirror 2, the antenna target 3, the insulating target frame 4 and the detection antenna 5 are all arranged in a vacuum chamber 6; the oscilloscope 8 and the digital delay generator 9 are placed in a faraday shield box 10.
The mode of operation of the laser and antenna target interaction inducing frequency controllable microwave irradiation apparatus of the present invention described above will be described with reference to fig. 1 to 3.
The experimental light source of the present embodiment is a femtosecond laser 1, which outputs a parallel pulse laser beam with a central wavelength of 800nm, a pulse width of 25fs, an energy of 400mJ, and a diameter of 3mm to the outside, preferably to ensure the laser beam to be transmitted in a vacuum environment. The off-axis parabolic mirror 2 deflects the parallel laser beam generated by the femtosecond laser 1 by 90 degrees and focuses the parallel laser beam to one end of the antenna target 3, and the focused focal spot diameter is adjustable from 6 μm to 60 μm, and is preferably 6 μm.
Among them, as an important feature of the present invention, the antenna target 3 is a solid target to be acted on by a focused laser beam, preferably a straight metal linear rod having a diameter of 1mm, for example, made of metallic copper, and a flat area having a size of about 1mm x 5mm for receiving the laser beam emitted from the laser source is preferably cut on an end face of one end of the rod in its length direction (i.e., axial direction). The plane area is set for the purpose of maximizing the laser focusing light intensity in the embodiment; meanwhile, the size of the plane area is not suitable to be too large so as to prevent the eigen radiation frequency of the antenna from being interfered.
As another important feature of the invention, the antenna target 3 is fixed to an insulating target holder 4 to ensure the electrical isolation of the antenna target 3 from the metal chamber surrounding it (which is usually used in laboratories and is electrically connected to ground), the insulating target holder 4 can be made of the collet type, in which the antenna target 3 is embedded, and it can have any other shape known in the art without departing from its electrical isolation. In contrast to the design of the embodiments of the present invention, in the prior art, a typical metal target is connected to a grounded metal chamber. Under the condition, compared with a metal target, the metal chamber belongs to a huge electrical structure, the integral microwave radiation frequency is mainly limited by the shape characteristics of the whole metal chamber, the appearance structure and the design of the metal target become irrelevant, and the microwave radiation frequency cannot be reasonably regulated and controlled all the time. The present invention overcomes this drawback.
When the laser beam focused by the off-axis parabolic mirror 2 is incident on the end of the antenna target 3 for receiving the laser beam emitted by the laser source, a plasma is generated and a large number of escaping electrons leave the antenna target, which form a pulsed current excitation on the antenna target, which in turn oscillates back and forth on the antenna target. Thus, the oscillating current on the antenna target generates microwave radiation. The frequency of the microwave radiation can be modulated by varying the antenna target length, for example by setting the length to 14cm, 28cm respectively. Specifically, the eigen radiation frequency f of the metal antenna target 3, the length l of the metal antenna target 3, and the speed of light c satisfy the following relationship:
l＝c/2f
it can be seen that the larger the size of the antenna, the lower its operating frequency band. This relationship can be utilized to uniquely determine the frequency of a specific corresponding microwave radiation by setting the antenna target to a specific length, and although the antenna target length is set to 14cm and 28cm in the present embodiment, the antenna target length can be set to other lengths, such as 1cm to 1000cm, such as less than 1cm, according to the frequency of microwave radiation that is set as required in practical applications. In application, the inventor finds that higher frequency microwave radiation is more beneficial to protecting electronic equipment from interference or damage, and therefore, the shorter antenna target is more preferred to avoid the frequency band in which the equipment is easily interfered in the actual environment.
The detection antenna 5 (the working frequency range is 50 MHz-2.2 GHz) is connected with an oscilloscope 8 (brand: Take, the working frequency range is DC-2.5 GHz, the model: DPO7254C) through a vacuum cable adapter flange 7 to jointly form a signal detection system for measuring the microwave radiation signal induced by the action of the laser and the antenna target, and finally, the data is exported and subjected to spectrum analysis, so that the corresponding microwave radiation frequency range of the tested antenna target under the irradiation of the laser is accurately known, and the purpose of inducing the microwave radiation with controllable frequency by the action of the laser and the antenna target is realized.
A digital signal delay 9 (brand: Stanford Research Systems, model: DG535) is connected to the femtosecond laser 1 and receives its input trigger signal, and its output is connected to the oscilloscope 8, for ensuring zero delay between the time when the laser reaches the target surface of the antenna and the microwave radiation detection time.
As a preferred form of this embodiment, the above process of this embodiment is carried out in the vacuum chamber 6 to avoid excessive laser focusing power and breakdown of air before reaching the antenna target, and the vacuum chamber is preferably equipped with a non-metallic flange to avoid microwave radiation resonating within the chamber. The vacuum metal cavity environment can be applied to the scenes of experiments like laser fusion and the like, so that high vacuum degree is obtained and high laser focusing intensity is realized.
As a preferred form of the present embodiment, the present embodiment uses the faraday shield box 10 to prevent the microwave radiation signal generated from the antenna target from being directly coupled to the oscilloscope 8 and the digital delay generator 10, thereby ensuring the normal operation thereof.
According to the workflow described above, as shown in fig. 2, the following can be summarized:
and step 16, recording the generated microwave radiation waveform, and analyzing the frequency spectrum of the microwave radiation waveform to obtain the microwave radiation characteristic parameters of the device.
Therefore, the microwave radiation characteristic parameters corresponding to the antenna target can be obtained, and finally the shape characteristic variables or the intrinsic electrical characteristic variables of the metal antenna target corresponding to the expected target microwave radiation characteristic parameters can be determined through the relationship between the shape characteristic variables or the intrinsic electrical characteristic variables of the metal antenna target and the microwave radiation characteristic parameters.
In summary, a system and method for controlling the frequency of microwave radiation generated by laser interaction with a solid target is shown, according to a first embodiment of the present invention. The inventors have found that commonly used electronics are more susceptible to damage or interference from low frequency microwave radiation signals. Therefore, according to an embodiment of the present invention, a commonly used solid target is modified into a series of linear antenna targets of a specific size by designing the antenna target structure and size, so that the frequency range of the generated microwave radiation is changed from tens or hundreds of mhz of the prior art solid target to the order of gigahertz or even tens of gigahertz which can be realized according to the embodiment one. As shown in fig. 3, in one test, the microwave radiation frequency generated from the 14cm long metal wire type antenna target 3 was about 1GHz, which was 2 times the 0.5GHz microwave frequency generated from the 28cm long metal wire type antenna target 3, as measured from the oscilloscope. This higher frequency microwave radiation may be more effective in avoiding possible damage to the electronics.
According to another embodiment of the invention, the antenna target 3, which is acted upon by the focused laser beam, is a spiral antenna structure of spring-like shape, the eigenfrequency of which is related to the number of spiral cycles, such as a spiral antenna target forming a current loop of N turns, the eigenfrequency of which is inversely proportional to the diameter a of the current loop and the number N of turns:
f～1/(a·N0.5)；
the antenna target 3 may be replaced by a birdcage coil antenna structure, such as a low-pass birdcage coil, having an eigenfrequency that is equal to or greater than the capacitance C and inductance L of the birdcage coil and the number N of legs of the birdcage coil
f＝2sin(πm/N)/(LC)0.5(wherein m is a positive integer not greater than N/2);
the antenna target 3 can also be replaced by an antenna pattern such as a dipole variable-flare-angle antenna structure, and the radiation frequency of the dipole variable-flare-angle antenna can be modulated by numerical simulation of the curvature and curve profile of a variable flare angle, so that the antenna has flat radiation performance mainly in a high-frequency band.
Variations in the physical characteristics of the metallic antenna target or variations in the intrinsic electrical characteristics of capacitance, inductance, or resistance may be used in accordance with the spirit of the present invention including, but not limited to, the above-described patterns. According to each specific antenna shape characteristic, the shape characteristic variable and the corresponding microwave emission spectrum of the specific antenna target can be accurately measured similarly to embodiment 1, so that the required shape characteristic parameter of the antenna target is selected according to the required microwave spectrum range, and the purpose of inducing frequency-controllable microwave radiation by utilizing the action of laser and the antenna target is achieved.
In another embodiment according to the present invention, the laser source used for the interaction with the antenna target may be any laser source that generates a laser beam in the femtosecond to nanosecond scale, the laser focal spot diameter may be 6 micrometers to 6 millimeters, the laser wavelength may be one of ultraviolet light, visible light, and infrared light, and the laser repetition frequency may be a single shot or up to 100 kHz.
In any embodiment according to the invention, the means for controlling the signal delay may be any brand of instrument of the prior art, but it is desirable to have the function of adjusting the time delay of the electrical signal in the nanosecond to millisecond time scale. The oscilloscope used for signal acquisition can also be any brand instrument in the prior art, but the requirements of microwave signal acquisition bandwidth and time precision are required to be met.
In any embodiment according to the present invention, the material of the antenna target 3 is a metal material that is beneficial for generating electromagnetic radiation, such as copper, gold, silver or other conductive materials, including but not limited to the above materials.
In any embodiment according to the present invention, the insulating target holder 4 is designed to hold the antenna target 2 and electrically insulate the antenna target 2 from the grounded vacuum chamber 6, and the insulating target holder 4 may have any other shape known in the art without departing from its electrically isolating properties, such as a bottom-mounted type in which the antenna target 3 is embedded or a jig type in which the antenna target 3 is suspended. The purpose of the electrical insulation or the electrical isolation is to directly regulate and control the intrinsic characteristics of the antenna target, such as the axial length, the number of the spiral coils and other respective appearance characteristics and electrical characteristics such as capacitance, inductance or resistance and the like, without being interfered by the metal cavity, so as to modulate the microwave frequency of radiation and realize the effect of inducing the frequency controllable microwave radiation by regulating the characteristics of the antenna target.
The invention is based on an antenna radiation mechanism and can generate microwave radiation with adjustable frequency in the interaction of laser and substances. Is not discovered and realized by the currently known research. Hopefully provides a method and a device for regulating and controlling microwave radiation in the laser fusion process. Meanwhile, the controllable microwave radiation generated by the action of the laser and the substance can be regarded as the microwave radiation driven by an optical means, and is beneficial to supplement the currently and generally adopted electric means for driving the microwave radiation.
It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (10)
1. An apparatus for inducing frequency controllable microwave radiation using laser interaction with an antenna target, said apparatus comprising:
a light source configured to output a laser beam;
focusing optics configured to receive the laser beam and focus it;
a metal antenna target configured to receive the focused laser beam at one end thereof, the focused laser beam interacting with the metal antenna target to generate microwave radiation;
a metal chamber for housing the light source, focusing optics, and a metal antenna target, the metal chamber and the metal antenna target being electrically isolated by an insulating target mount; and
a signal detection system configured to determine a frequency of the microwave radiation; wherein the content of the first and second substances,
and controlling the frequency of the microwave radiation by determining the corresponding relation between the appearance characteristic variable or the intrinsic electrical characteristic variable of the metal antenna target and the frequency of the microwave radiation.
2. The apparatus of claim 1, wherein the metallic antenna target is linear in shape, and the frequency of the microwave radiation is controlled by controlling the length of the metallic antenna target along the length direction.
3. The apparatus of claim 1, wherein the metallic antenna target is a helical antenna target, the frequency of the microwave radiation being controlled by controlling the diameter and number of turns of a current loop of the helical antenna target.
4. The apparatus of claim 1, wherein the metallic antenna target is a birdcage coil antenna target, and the frequency of the microwave radiation is controlled by controlling the capacitance, inductance, and number of birdcage coil legs of the birdcage coil antenna target.
5. The apparatus of claim 1, wherein the metallic antenna target is a dipole variable-angle antenna target, and the frequency of the microwave radiation is controlled by controlling a variable-angle curve profile of the dipole variable-angle antenna target.
6. The apparatus according to any one of claims 1 to 5, wherein an end face of one end of the metal antenna target for receiving the focused laser beam has a planar area on which the laser beam is focused.
7. The apparatus of any one of claims 1 to 5, wherein the interior of the metal chamber is evacuated, the metal chamber further comprising a vacuum cable adaptor flange made of a non-metallic material configured to connect a signal detection system with the metal chamber.
8. The apparatus according to any one of claims 1 to 5, further comprising a Faraday shield box, the signal detection system being disposed within the Faraday shield box.
9. The device of any one of claims 1 to 5, wherein the metallic antenna target is made of one or a combination of copper, gold and silver.
10. A method of inducing frequency controllable microwave radiation using the apparatus of claim 1, comprising the steps of:
step 1: selecting a metal antenna target with a shape characteristic variable or an intrinsic electrical characteristic variable;
step 2: generating microwave radiation through the equipment, analyzing the frequency spectrum of the microwave radiation through the signal detection system, and determining the microwave radiation characteristic parameters of the metal antenna target;
and step 3: and determining the appearance characteristic variable or the intrinsic electrical characteristic variable of the metal antenna target corresponding to the expected target microwave radiation characteristic parameter according to the relation between the appearance characteristic variable or the intrinsic electrical characteristic variable of the metal antenna target and the microwave radiation characteristic parameter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910299224 | 2019-04-15 | ||
| CN201910299224X | 2019-04-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111490437A true CN111490437A (en) | 2020-08-04 |
Family
ID=71798724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010293754.6A Pending CN111490437A (en) | 2019-04-15 | 2020-04-15 | Device and method for inducing frequency-controllable microwave radiation by utilizing action of laser and antenna target |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111490437A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1482689A (en) * | 2003-07-29 | 2004-03-17 | 中国科学院上海光学精密机械研究所 | MgIn*O*/MgO composite underlaying material and preparing process thereof |
| CN101459280A (en) * | 2007-12-12 | 2009-06-17 | 索尼株式会社 | Antenna, communication device, antenna manufacturing method |
| WO2009083550A1 (en) * | 2007-12-31 | 2009-07-09 | Forschungsverbund Berlin E. V. | Device for doubling the frequency of laser radiation |
| CN102903591A (en) * | 2012-10-12 | 2013-01-30 | 上海交通大学 | Ultrafast lens-free coherent electron diffraction imaging method and device |
| WO2014143522A1 (en) * | 2013-03-14 | 2014-09-18 | Cymer, Llc | Target for extreme ultraviolet light source |
| CN104617482A (en) * | 2015-02-10 | 2015-05-13 | 中国工程物理研究院激光聚变研究中心 | Laser micro-focus plasma K alpha radiation source |
| CN106816349A (en) * | 2017-01-09 | 2017-06-09 | 中国科学院物理研究所 | A kind of direct current photocathode ultra-fast electron gun |
| CN206532874U (en) * | 2016-12-05 | 2017-09-29 | 中国工程物理研究院激光聚变研究中心 | A kind of electromagnetic impulse radiation device of pulse laser excitation |
| CN107910734A (en) * | 2017-12-06 | 2018-04-13 | 中国工程物理研究院激光聚变研究中心 | A kind of microwave pulse emitter of Laser Driven |
-
2020
- 2020-04-15 CN CN202010293754.6A patent/CN111490437A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1482689A (en) * | 2003-07-29 | 2004-03-17 | 中国科学院上海光学精密机械研究所 | MgIn*O*/MgO composite underlaying material and preparing process thereof |
| CN101459280A (en) * | 2007-12-12 | 2009-06-17 | 索尼株式会社 | Antenna, communication device, antenna manufacturing method |
| WO2009083550A1 (en) * | 2007-12-31 | 2009-07-09 | Forschungsverbund Berlin E. V. | Device for doubling the frequency of laser radiation |
| CN102903591A (en) * | 2012-10-12 | 2013-01-30 | 上海交通大学 | Ultrafast lens-free coherent electron diffraction imaging method and device |
| WO2014143522A1 (en) * | 2013-03-14 | 2014-09-18 | Cymer, Llc | Target for extreme ultraviolet light source |
| CN104617482A (en) * | 2015-02-10 | 2015-05-13 | 中国工程物理研究院激光聚变研究中心 | Laser micro-focus plasma K alpha radiation source |
| CN206532874U (en) * | 2016-12-05 | 2017-09-29 | 中国工程物理研究院激光聚变研究中心 | A kind of electromagnetic impulse radiation device of pulse laser excitation |
| CN106816349A (en) * | 2017-01-09 | 2017-06-09 | 中国科学院物理研究所 | A kind of direct current photocathode ultra-fast electron gun |
| CN107910734A (en) * | 2017-12-06 | 2018-04-13 | 中国工程物理研究院激光聚变研究中心 | A kind of microwave pulse emitter of Laser Driven |
Non-Patent Citations (1)
| Title |
|---|
| ZI-YU CHEN 等: "Microwave radiation mechanism in a pulse-laser-irradiated Cu foil target revisited", 《PHYSICA SCRIPTA》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Jiang et al. | High power microwave generation by a coaxial virtual cathode oscillator | |
| JP3037433B2 (en) | Variable frequency microwave heating device | |
| CN105973871B (en) | A kind of the microcell scanning means and its microcell scan method of spectral detection Elemental redistribution | |
| KR100363602B1 (en) | Apparatus and method for microwave processing of materials | |
| US6646382B2 (en) | Microminiature microwave electron source | |
| Russo et al. | Experimental characterization of a surfaguide fed plasma antenna | |
| Stenzel | High-frequency instability of the sheath-plasma resonance | |
| Fan et al. | Experimental investigation of an improved MILO | |
| Chen et al. | Design and application of near-field applicators for efficient microwave-assisted laser-induced breakdown spectroscopy | |
| Tax et al. | Experimental study of the start-up scenario of a 1.5-MW, 110-GHz gyrotron | |
| US8879061B2 (en) | Analysis apparatus and analysis method | |
| US7394642B2 (en) | Tubular capacitor with variable capacitance and dielectrically elongated inner electrode for NMR applications | |
| Klimov et al. | Highly efficient generation of subnanosecond microwave pulses in Ka-band relativistic BWO | |
| CN111490437A (en) | Device and method for inducing frequency-controllable microwave radiation by utilizing action of laser and antenna target | |
| CN112558001A (en) | Pulse high-power field calibration device and method | |
| US20130208274A1 (en) | Analysis apparatus and analysis method | |
| JP2010508526A (en) | Apparatus and method for detecting electrical properties of excitable material samples | |
| Schopp | Characterization and Multi-Physical Analysis of RF-driven Microwave plasma applications from 1.3 GHz to 3.5 GHz | |
| RU210996U1 (en) | THz pulse generator - radiation | |
| Naumenko et al. | Development of Ka-range magnetron for portable radar | |
| Brand | Development and applications of frequency tunable, submillimeter wave gyrotrons | |
| Ivanov et al. | Radiation spectrum of a relativistic plasma microwave amplifier | |
| Rybalko et al. | A setup for measuring characteristics of microwave electric vacuum devices with open resonance structures | |
| CN219066747U (en) | Frequency-adjustable pulse electron source and electron microscope | |
| Perkins et al. | Small radio frequency driven multicusp ion source for positive hydrogen ion beam production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200804 |
|
| WD01 | Invention patent application deemed withdrawn after publication |