TW200924567A - Laser-beat-wave photocathode electron accelerator and electron radiation apparatus using the same - Google Patents

Abstract

An electron radiation apparatus is provided. The electron radiation apparatus includes a beat-wave laser system generating a laser beat wave, an electron emitter emitting a density-modulated electron current induced by the laser beat wave, an electron accelerator accelerating the density-modulated electron current and generating a periodically bunched electron beam, and a radiation device receiving the periodically bunched electron beam and generating an electron radiation with a radiation frequency matched to one of the harmonics of the bunching frequency of the periodically bunched electron beam.

Description

200924567 IX. Description of the invention: [Technical field to which the invention pertains] The present invention is a photocathode electron accelerator, and more particularly to a photocathode electron accelerator for use in an electronic private project and excited by a laser beat. [Prior Art] Electron accelerators are a very useful tool for basic and applied research' and one of the important applications is for the generation of electromagnetic radiation. A typical electronic radiation device comprises three main components, namely an electron emitter, an electron accelerator and a radiation device; firstly, the electron emitter generates low-energy electrons and further accelerates into high-energy electrons via an electron accelerator. These high energy electrons are then injected into the firing device to generate electron radiation. In practical applications, different light-emitting devices are used in different electronic radiation devices. For example: the radiation device of a free-electron laser (FEL) device is an undulator; the radiation device of a Smith-Purcell radiator is a grating; and Cherenkov (Cherenkov) The radiation device of the radiator is a dielectric; in addition, the radiation device of the backward-wave oscillator is a slow wave waveguide. The effectiveness of electron radiation depends mainly on the characteristics of these driving electrons. There are two mechanisms for the known electron radiation in terms of the length of the electron bunch relative to the radiated wave. In short, 200924567 two = the length of the sub-bunch is much larger than the wavelength of the radiation, these electron fields, the middle will produce incoherent ―, the light energy of this ray is linear or total electron number, and i Gubei 4, this electricity in the machine ^, a variety of non-coherent radiation usually occurs in synchronous addition;;; shot. However, when the length of the electron bunching is significantly smaller than that of the light beam, these electrons will produce coherent radiation in a manner of (sup(10) dianee), and this =

The light energy is proportional to the square of the electron flow or the total number of electrons. Specifically, when 赍_, and #勒处旦, a electron is emitted by the radiation device regardless of the nature of the radiation. For the time being, a light-go table pnercrv, Ganshan „, and month b are in the degree (spectral eight in W for the radiant energy, rate, and in the subscript symbol device) by a string of electrons The total energy emitted by the main ^ electron bunching time % relative to the radiation of the ', depends on the electron bunching length % relative! :== relationship, or take L's ... its electron wavelength of the wavelength m " Then, when the solid electrons are averaged in length, when the light is emitted through the radiation device, the various possible phase emitters of the gentleman can be expressed by the following equation: the obtained light energy (•V-L=M Since not all of them are increased by the equation (1) generated by electrons, such β 耵琢 will be constructively shot by Koda, which is a non-coherent light shot. However, such as 200924567 electrons with time or Tb~〇 The cloth 'all radiation fields generated by the electrons will be in phase, and the sum of the two's will be equal to the object please: such a process, called the ultra-light emission heart:: _S_) or super-radiation' Positive radiation energy. To illustrate a right 7 卞Dozens of squares have a limited electron bunching length %, and the energy generated by an electron bunching can be CL, /, (8) 4 where: ω) is an electronic pulse waveform function with a single wave vibration The Fourier transform function. If the rate of such an electron is repeated, the total light energy that is lightly emitted is: - [dW/da)^pb = N; Nlb {dWjdm\ Ml {ω)Μ\ (ω) Where Ρ equation Ο) sin2(~·~) N2pb sin2(^/c^) which is the sum of the coherence of the radiation fields emitted by all the micro bunches, a single wave with a frequency of =丨, 2, 3...) In order to obtain high radiated light energy, a short bunching length (paper ^(4)~丨) can be used, and it is made to conform to the frequency of the harmonic of the bunching frequency (ω = ). When wind 2 (仞)=1, then light light ("shoulder, /Μ, this also shows the relationship between light energy and squared ratio. In many applications, narrow linewidth radiation is very important; In the case of short electron bunching, Mb2(w) is usually a broadband function. When ω=^ωkun, paper 2 (the function obtained by 岣 function = 200924567 is about the width of the light, which is a large number of periodic electron bunching Words (wPb is very large), may be far narrower than the light width of the radiation device determined by ^^ (which is determined by ^, under this limitation, when the radiation frequency is equal to the same time (the volume of light (four) is similar to Λ42(ω) or ~ω—/Λ^ is wide in light. See Figure 1 for a schematic view of a prior art electronic radiation device. The electronic wheeling device 1 includes a pulse-driven laser system. 10. An electron emitter 13, an electron accelerator 14, and a radiation device 17, wherein the electron emitter 13 and the electron accelerator 14 are ', and are collectively referred to as a photocathode electron accelerator 12. When a laser pulse η from the pulsed laser system 10 is incident on the emitter 13, the electron emitter 13 emits an electron;

And the emitted electronic pulse 15 is immediately accelerated to become a two-energy electron pulse 151. The electron-emitting device 1 further includes an electron beam transmission system 16 for transmitting the high-energy electron pulse and projecting the light-emitting device to generate a light-pulse pulse with a value of a beam. The wheel system 16 may further include a focus or turn 'element' f-electron beam, or may further include an accelerator to accelerate the electric power due to the length of the laser pulse U and its resulting: 15 and the high-energy electron pulse 151 The long specific impulse 18 has a long wavelength, so it is similar to: the light energy shown by the formula (1), or when it is in a 1-shot device with a raw =:=, etc., the radiation pulse can be produced: 200924567 (2) ~ (4) shows a substantial increase in light energy. It is known that electronic single-pass radiation equipment can also generate electronic super-radiation, such as Smith-Purcell, Cherenkov radiator and up-converter magnet radiator. The mechanism for generating super-radiation is that the initial incoherent radiation field reacts to the electrons and gradually forms electron micro-bundles in the laser device. When these micro-bundles are formed in the radiation field, the radiant energy is reached. High levels of saturation; however, 'most single-channel radiation devices do not get enough radiation to reach super-radiation and saturate the radiant energy. In the FEL oscillator, when the electromagnetic signal is gradually generated between the two resonant mirrors in the laser oscillator, the electrons can also form a periodic bunching and effectively generate radiation; unfortunately, the structure of the FEL oscillator is much longer than that of the FEL oscillator. Single channel radiation equipment is complicated. In order to help the electrons to self-converge, the FEL oscillator can be equipped with a §modulator undulator followed by a drift distance and magnetic chicane; this modulation increases A device for a modulator undulator is often referred to as an optical klystron because a kinematic tube of a microwave amplifier has a structure that excites electrons to self-converge. However, since the optical klystron with a short structure has a weak spontaneous emission field, the density adjustment of the electron beam is very limited. In order to overcome the shortcomings of optical klystrons, a very long frequency-increasing magnet is provided for use in a high-gain single-channel FE]L to generate self-increasing spontaneous emission (self_ampHfied 200924567 spontaneous emission, SASE) . Although this single-channel technology avoids the use of resonant mirrors in FEL, the length of the up-converter magnet is much longer than that of conventional up-converter magnets, and the quality of the electron beam used to drive SASEFEL (emission, energy) Dispersion and electron current density) must be much higher than conventional FEL oscillators; in addition, this single-channel FEL amplifies quantum noise in electrons, thus outputting spurious radiation in the time and frequency domains. In order to solve the noise output problem of SASE FEL, a laser seeded modulator undulator equipped with SASE FEL is used to induce the formation of periodic bunched electrons, and this periodic bunching The beaming frequency of the electrons is the same as the sub-harmonics of the SASE FEL radiation frequency. However, this so-called high gain harmonic generation (HGHG) technique requires the use of modulated upconverting magnets and laser sources of a specific frequency; and in order to make the wavelength of the radiation much smaller than the laser wavelength, this HGHG technique requires a large number of series modulations. Increased frequency magnet structure. In summary, in the prior art, all coherent light-emitting devices simply use the electron flow formed by the existing electron accelerator, and must be concentrated by the electron accelerator to generate effective electron radiation; These methods are complex, expensive, and not efficient enough. Therefore, there is a need in the industry for a new electronic accelerator and a new coherent radiation device to overcome the shortcomings of the prior art. For this reason, the applicant invented the case "Laser Chopper Photoelectrode Accelerator and Its Electron Radiation Equipment" in order to improve the lack of the above-mentioned conventional methods. SUMMARY OF THE INVENTION According to the concept of the present invention, the present invention provides an electronic radiation device using a beat wave laser system as an electron source, comprising a beat wave laser system, a first turtle emission state, an electron accelerator, and a radiation device. Wherein the beat wave laser system generates a laser beat wave, the electron emitter is induced by the laser beat wave to emit a density-regulated electron flow, the electric 2 accelerator accelerates the density-regulated electron flow, and generates a periodic gather An electron beam is bundled, and the radiation device receives the periodic bunched electrons to generate an electron radiation. The device according to 1, wherein the beat wave-shooting system generates the laser beat wave by the two fields and the field, and the two shots are shot on the day of the thunder. The frequency offset of Δ· makes the Thunder beat have a beat frequency Δω/2π. Tian Hao frequency as described in the device, wherein the beat wave laser system overlaps two linear (requency chlrped) laser fields to generate a Guhai delay Δ and has a phase between the fields; time alignment, gate... Among them, the ------ ------ 丫 丫 于 于 于 于 于 辐射 。 。 。 。 。 。 。 。 。 。 。 辐射 辐射 辐射 。 辐射 辐射 。 辐射 辐射As described, wherein the electron light is _Electronics 11 200924567, the electron ray has a _ light energy proportional to the square of the density-adjusted electron current. The apparatus as described, wherein the radiation device is selected from the group consisting of a frequency-increasing magnet, a grating, a dielectric, and a slow wave waveguide - '0

As described, it is further selected from one of a free electron laser device, a Smith-Puixell radiation n, a cherenk Qv ray transmitter, and a reverse wave oscillator. According to the concept of the present invention, the present invention further provides a laser-shooting photocathode electron enchantment, which includes a beat wave (four) system, an electron wave = and an electron accelerator; wherein the beat wave laser system generates a ^ beat The electron emitter is induced by the laser beat wave to emit a regulated electron current, and the electron accelerator accelerates the density adjustment electron fairy and generates a periodic bundled electron beam. An accelerator as described, wherein the electron emitter is a photonic envelope that depends on the intensity envelope of the laser beat. 2 The concept of the material, the case is more provided - the kind of wave-shooting laser system is generated by the radio frequency 1 and the red laser field is generated - the laser beat wave; the partial; the laser field between the two pairs has a fixed frequency = 'Make the laser beat wave - beat frequency dirty. Ji Tong, the concept of 'this case provides another kind of beat wave laser two linear song frequency laser field generated - laser beat wave' between the two linear scattered frequency laser field 12 200924567 [Embodiment] The following is for this case A preferred embodiment of a laser-photographed photocathode electron accelerator and its one-shot apparatus is described. Referring to the drawings, the configuration of the c2 and the method of the dragon line do not have to completely conform to the internal struggle of the school. The skilled person will be able to make various changes and modifications without departing from the actual spirit and scope of the present invention. </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> Fig. 2 is a schematic view of an electronic radiation device of the preferred embodiment. The electron radiant device 101 comprises a radiation device 17 and a laser slap photocathode electron accelerator 22, wherein the laser slap photocathode electron accelerator 22 comprises a beat wave laser system and a photocathode electron accelerator 12; and the photocathode The electron accelerometer 12 has an electron emitter 13 and an electron accelerator 14, wherein the electron emitter 13 can be a photocathode 13. The beat laser system 20 provides a laser beat 2 and directs it into the photocathode to produce a density-adjusted electron stream 25 that is dependent on the laser beat 21 a periodic variation of the intensity envelope, wherein the carrier frequency of the laser beat 21 must be sufficiently high that the amount of light can overcome the work function of the cathode material of the electron emitter 13 to produce light emission; and then, the density adjustment The electron stream 25 is immediately accelerated in the next electron accelerator 14 to obtain a high energy 13 200924567 amount, and is further converted into a - period bunched electron beam 25i. The electronic :::: two 1 further includes an electron beam transmission system 16 which is fortunately passed through the electron beam transmission system 16 to the Kosei device Π' for generating 28 having high brightness. The frequency of the electron light beam 28 coincides with the waves of the frequency of the beam of the periodic bunched electron beam 251 2 , and therefore, the electron two 28 has a flat (four) light energy that is f proportional to the density-adjusted electron current 25 .

Referring to Figure 3, there is shown a schematic diagram of a laser beat wave generated by a beat wave system of a preferred embodiment of the present invention, wherein the beat wave laser system comprises two (four) (four) having a -like offset. The beat wave laser system 2001 includes two laser fields i and 2 having two frequencies 〇) and ω+Δω, respectively; when an equal intensity is obtained in the two laser fields i and 2, a laser beat 211 The total instantaneous intensity is: 7 (10) = 8 /. Coffee 2 [(correction)' + IW (contention + exaggeration) Equation (5) where /〇 is the root mean square intensity of each laser field, ω+Δω/2 is the laser beat 211 wealth Frequency or carrier frequency, △ slightly △ 姣 the two = phasedifference between the fields 1 and 2, and / is 呀1. The faster carrier frequency is used to overcome the work function (w〇rk functi〇n) of the photocathode 13 in Figs. 1 and 2, and the intensity envelope repeated with a beat frequency Αω/2π=1/τΐην The photocurrent emitted from the photocathode i3 can be adjusted in density, and thus the 4-period bunched electron beam 251 as shown in Fig. 2 can be generated by the photocathode 13. Further, the bunching frequency of the periodic bunched electron beam 251 as shown in Fig. 2 can be adjusted by changing the frequency difference between the two laser fields 丨 and 2, 14 200924567 Α ω / 2π. Please refer to Fig. 4, which is a schematic diagram of a 雷 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 , , , , , , , Offset to solid lightning (..-2). The beat laser system fine 2 includes the solid-field radiation field, #′ in the laser spectrum, the two shots of the #field have a solid-state, rate offset discussion; in the equal vibration and lock phase = laser field, The coherent sum of the laser beat 212 formed by the laser field with a momentary beat strength is:

Ijm -2m ^〇〇〇52[ωί + (Ν-1)(Αωί + Αφ)/2]· or its time average beat envelope is: .2 Ν(Αωί + Αφ) ^2 ^(Αωί + Αφ) Equation (6) 2

!sin2-^±M 2 2 #2 sin2 (Afijr + Αφ) 2 Equation (7) where all the laser fields are locked to the m-bit offset Δ蚧+Δ^. Equation (7) clearly shows that the laser beat 212 has a pulse width and is repeated at a frequency Δω/2π, wherein the pulse width is affected by the factor of # and the source is shown in Fig. 3 This laser beat 211 from both laser fields is reduced. By changing the number of interference waves, the beat pulse width 该 of the laser beat 212 is adjusted to be optimized in accordance with the adjustment depth of the density-adjusted electron current 25 emitted by the photocathode 13 in FIG. . Please refer to FIG. 5, which is a schematic diagram of a laser beat wave generated by a laser system of the second embodiment of the present invention, wherein the beat laser system 2003 includes two linear frequency radars. Shooting field. two

The frequency laser field 2 is generated by a pulsed laser source 25=5, which is used to generate a linear frequency laser pulse 255. Wherein, the pulsed laser source 25 〇 can be a typical mode-locked laser source, such as _ mode-locked titanium sapphire laser, - mode-locked 镱 laser, or - mode-locked laser, And the two: The linear song frequency laser field 2 (four) 262 has a relative time delay Αί 270. In order to separate the equalization from the linear chirped laser pulse 255, the two linear chirped laser fields 261 and 262 have a specific frequency ω' and their complex oscillations (_plexamplitud'e) can be divided into another J as 'r 2+ plus; where τ Θ = the pulse width of the laser pulse, α is a coefficient used to describe the I = = of the chirp frequency and φ is a phase change. The two linear chirps and the combination of 261 and 262 produce a beat laser pulse 280, which has an oscillation intensity envelope, and the oscillation intensity envelope is subjected to , where is less than a fixed phase, and == delayed Δ, the carrier frequency ω and the constant: , , 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 经由 261 261 261 261 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及The beat frequency of the beat laser pulse 280, and the density of the density-adjusted electron stream 25 shown in the figure 2 is shown in the figure of another preferred embodiment of the present invention. Electron 16 200924567 Schematic diagram of a radiation device, wherein the electron radiation device is a Smith-Purcell radiator for emitting electromagnetic radiation having a frequency of 1 ΤΗζ. The electronic radiation device 103 includes a beat wave laser system 20, a photocathode accelerator 12, an electron beam transmission system 16 and a radiation device Π; wherein the photocathode accelerator 12 includes a photocathode 13 for emitting photoelectrons, and a The anode 14 is used to establish an electric field to accelerate the electrons. In the design of this embodiment, the beat laser system 20 has two continuous wave (CW) seed lasers, wherein the first seed laser 201 is a distributed feedback semiconductor laser (distributed-feedback) Diode laser), which is fixed at 1538.98 nm; and the second seed laser 202 is a tunable wavelength semiconductor laser, or specifically an external-cavity diode laser (ECDL) A tunable wavelength of 1520-1600 nm. The two semiconductor lasers are commonly used in optical communications with communication bands between 1200 and 1600 nm. For example, the first seed laser 2 〇 1 can transmit a wavelength 'specified by the ITU (International Telecommunication Union) and the second seed laser 202 has a tunable wavelength that covers the lowest loss of the telecommunication fiber. The wavelength of the second/seed laser 202 is adjusted to 1542.93 nm to provide a frequency offset of 0.5 相对 relative to the frequency of the first seed laser 201. The two seed laser signals are combined in a fiber optic shank 203 and sent to a laser amplifier 205 having a slanted fiber amplifier and a pulsed optical parametric amplifier (〇ptical 17 200924567 parametric Amplifier, OPA). The erbium doped fiber amplifier amplifies the continuous beat power to about 40 mW, with two of the laser fields 1 and 2 each having 20 mW. The pulse OPA further increases the total energy of the beat laser to 20 pJ/pulse and the pulse width is approximately one billionth of a second (1 ns). The OPA's pump laser is injected into a 1064 nm Q-switched chrome (Nd:YAG) laser with a 1 kHz pulse repetition rate and ~Ins pulse width with a peak power of 150. kW. The 0PA uses a 3 cm long periodic polarization LiNb03 (PPLN) crystal as its gain medium. The PPLN crystal has a quasi-phase matching period of 29.68 μπι, which makes the phase of the two laser fields 1 and 2 at 97 °C. Match to the 1064 nm pump wavelength. The amplified laser beat pulse is then multiplied to a 769.49 nm and 771.46 nm (frequency offset of 1 THz) in a laser harmonic generator 206, each of the two laser fields 1 and 2 The field has nearly 50% energy conversion efficiency. The twice-amplified laser beat wave 21 is sent to the photocathode 13 in the photocathode accelerator 12 via a vacuum port 29; and the wavelength or frequency of the laser field 2 relative to the laser field 1 can be adjusted to adjust the The beat frequency of the laser beat wave 21. The photocathode 13 is a gallium arsenide (GaAs) photocathode, and the photocathode 13 is biased with the anode 14 to form a variable voltage of 10 to 60 kV. In the laser beat 21, photon energy of a wavelength of about 750 nm is sufficient to induce density-adjusted light emission from the photocathode 13. The emitted density-adjusted electron stream 25 is then accelerated toward 18 200924567 toward the anode 14 and converted into a high-energy periodic bunched electron beam 251; the high-energy periodic bunched electron beam 251 enters through the hole of the anode μ Electron beam transmission system 16. At a quantum efficiency of about 0.5, the 1 〇-pulse, ^ pulse width of the laser beat is sufficient to generate 2xlQl3 electrons in ^, or 2xl 〇 1G electrons in 1-ps beat pulses . A gallium arsenide photocathode typically requires an ultra-high vacuum and has an emission time constant of close to or at 1 ps. Another design for photocathode accelerators is the use of a fast-reacting copper photocathode. In order to induce photoelectron emission from a copper cathode, a beat wave at a wavelength of about 77 〇 nm is further triple-amplified into a ultraviolet (UV) wavelength in the chopper generator. In the case of using the same design parameters as described above, the total wheel of the uvf beat wave = 2 is approximately 2 p/pulse at the lns pulse width, and has a ~10% conversion in a third harmonic generator. effectiveness. In order to maintain the 1 - Τ Η Z beat frequency of the UV laser beat, the rate shift of the two seed semiconductor lasers is adjusted to 1 ΤΗζ / 6 because the laser harmonic generator will turn into the laser frequency It became six times. If the two beat fields in the harmonic generator generate nonlinear cross-mixing, a laser field is generated, in which two adjacent laser fields have a frequency offset equal to the original frequency offset, which When you enter 2 直接 directly, you do not need to input a 1 ΤΗζ/6 beat laser. It is conservatively estimated that if a copper cathode has a quantum efficiency of 2.5 before 6, the υν laser beat of the (4) zhong^ is sufficient to generate 6 5 χ 1 〇 6 electrons in l_ns, or in every 19 200924567 1 - ps beat pulse. Produces 6.5x103 electrons. The accelerating design was developed by a space charge tracking code called ASTRA, developed by Floettmann of the Electron Synchrotron Facility, DESY, Germany. In this design simulation, the photocathode emits 50 Gauss electrons, each electron bunching has a bunch length of 0.2-ps rms in a period of 50-ps, and each electron bunch contains 1 The fC charge is 6.5 x 103 electrons, so the average current in the 50-ps time is 1 - Hi A . These electrons are evenly distributed over the cathode in a radius of 0.3 mm rms and are confined in a 1-T axial magnetic field and accelerated towards the anode at a distance of 4.5 cm to obtain 42-keV of energy. . As shown in Figures 7(a) and 7(b), they represent the emitted electrons in the cathode and the value of the 42-keV output electrons output from the accelerator, respectively. Comparing Figures 7(a) and 7(b), it can be seen that during the electron acceleration process, the integrity of the electron bunching of the period is still maintained well, although the accelerated electrons are affected by the space charge force. The time is slightly redistributed, and the light energy that is enhanced by the harmonics of the bunching frequency caused by the periodic bunching is also very obvious. In particular, the (four) intensity at the first harmonic frequency of 1 THz is almost the same before and after electron acceleration. The electron beam delivery system 16 is adapted to deliver an electron beam having an appropriate beam size and divergence angle to suit a suitable location in the radiation device 17. For low energy electrons, the electron beam delivery system 16 can use an electrostatic lens and deflector to focus or deflect the electron beam, respectively. The radiation device 17 downstream of the electron-emitting device 103 is a Smith-Purcell radiator using a metal grating 171, and when the periodic bunched electron beam 251 traverses the metal grating 171, The surface of the metal grating produces a radiation 28 at an angle. The wavelength of the radiation produced by a Smith-Purcell is determined by the following equation:

Xr = A(l/y^-cos(9)/w Equation (8) where Λ is the grating period, β is the electron velocity divided by the speed of light, β is the emission angle emitted from the grating surface, and w is the winding According to equation (8), when a 42-keV electron beam emits 1-THz Han at a 45 degree angle (m = 1) of the grating surface, the Smith-Purcell grating period may be 157 μm. In the case of 6.25 χ 103 electrons/bundles and 1000 bunches from a copper photocathode electron accelerator, and wherein 6.25 x 103 electrons/bundles and 1000 bunching sites are within a 1 ns period, when When the beam of electron beams is compared, when the Smith-Purcell radiator generates 1 THz radiation, the energy spectrum of the generated light will increase by 6.25χ103χ1000 times due to coherence, which is almost 7 times higher than the conventional radiant energy. It is worth noting that although the electronic radiation device 103 in the above embodiment is a Smith-Purcell, it should not be limited to the design of such a radiation device. That is, when the radiation device used is increased Electron provided by the present invention when a frequency magnet, a dielectric or a slow wave waveguide The shooting device can also be a free electron laser device 21 200924567 摅Γ 灿 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 Radiation or a::The laser amplifier can be a linear laser amplifier with two light-emitting amplifiers, wherein the nonlinear laser amplifier comprises a combined 2 or Raman amplifier. Using string: two-linear frequency mixing, nonlinear A laser amplifier can generate a laser field that is offset by Δ♦; instead of a line

The material can be composed of second- and third-order nonlinear optical materials, including Raman materials, optical parameter materials, and electricity. *The super-radiation generated by the periodic bunched electron beam is the same as the redundant electromagnetic injection, and the electronic radiation device using the laser-shooting 2 cathode electron accelerator in this case overcomes the prior art, and greatly improves Prior art (four) shooting performance. Yes, this case demonstrates that the various existing technologies that exist at present are superior, and it is an invention with great industrial value. In the above, the examples are merely exemplified for convenience of explanation, and they may be made by a person skilled in the artisan; and they are modified in various ways, and are not intended to be protected by the scope of the patent application. [Simple description of the figure] Fig. 1 is a schematic diagram of an electronic_device of the prior art. FIG. 2 is a schematic diagram of an electron-emitting device according to a preferred embodiment of the present invention. 222424567 FIG. 3 is a schematic diagram of a thunder wave generated by a beat wave laser system according to a preferred embodiment of the present invention, wherein the beat wave The radiation system includes two laser fields with a fixed frequency offset.

Figure 4 is a schematic diagram of a laser beat wave generated by a beat wave laser system of another preferred embodiment of the present invention, wherein the beat laser system comprises N laser fields (at 2) on the #射光谱谱The two-field laser field has a fixed frequency offset. f. A schematic diagram of a field-shot wave generated by a beat-wave system of still another preferred embodiment of the present invention, wherein the beat-wave system comprises two linear frequency-frequency laser fields having a relative delay of four. Figure 6 is an illustration of an electronic radiation device of another preferred embodiment of the present invention. The 5H electronic emission device is a Smith-Purcell radiator. Fig. 7(a) is a photo characteristic diagram of the density-adjusted electron current in the electron emitter of the electron-emitting device of Fig. 6. Fig. 7(b) is an electron accelerator of an electron-emitting device of Fig. 6 (light characteristic diagram of a periodic bunched electron beam emitted by J. Laser field light-emitting device pulse-driven laser system laser pulse photocathode electron Accelerator Electron Transmitter [Main Component Symbol Description] 1, 2 10〇, 101 v 103 10 11 12 13 23 200924567 14 Electron Accelerator 15 Electronic Pulse 151 South Energy Electron Pulse 16 Electron Beam Transmission System 17 Radiation Device 171 Metal Grating 18 Radiation Pulse 20, 2001, 2002, 2003 beat wave laser system 201, 202 seed laser 203 fiber optic clutch 205 laser amplifier 206 laser amplifier 21, 211, 212 laser beat wave 22 laser beat wave photoelectron electron accelerator 25 Density regulated electron flow 250 pulsed laser source 251 periodic bunched electron beam 255 linear chirped laser pulse 261, 262 linear chirped laser field 270 relative time delay 28 electron radiation 280 beat wave laser pulse 24

Claims (1)

200924567 X. Patent application scope: 1. An electronic radiation device comprising: a beat wave laser system for generating a laser beat wave. An electron emitter that is induced by the laser beat wave to emit a density Regulating the electron flow; an electron accelerator for accelerating the density-regulated electron flow and generating a periodic bunched electron beam; a radiation device for receiving the periodic bunched electron beam and generating an electron beam. The apparatus of claim 1, wherein the beat wave system further comprises a laser field, wherein the financial laser % has a fixed frequency Δ(1)... In order to overlap the financial f wave, the laser beat has a beat-beat shot. 3. As claimed in the patent scope! The equipment described in the item, the laser system further contains two linear = two / frequency laser field β mesh + item field shot % 'the two linear 啾 / Beita 耵% has a relative time delay △" two linear songs The frequency f-spot beat has the device of making the laser...the rate of change of the autumn frequency, and the device of the relative time delay &amp; and the bunching t = 1 rate, wherein the cycle-beat frequency is adjusted The rate is determined by changing the laser beat wave as described in the patent application, the device described in the article, the frequency of the electron 200924567 radiation and the harmonic frequency of the periodic bunched electron beam 6. The device of claim 1, wherein the electron radiation is an electronic super-radiation having a light energy proportional to the square of the density-adjusted electron flow. The device of claim 1, wherein the radiation device is one of a grating, a dielectric, and a slow wave waveguide per self-regulating magnet. 8. As described in claim 1 Equipment, selected from a free electronic mine a device, a Smith-Purcell radiator, a Cherenkov radiator, and a reverse wave oscillator. 9_ A laser beat photocathode electron accelerator comprising: a beat wave laser system for generating a mine a slap wave; an electron emitter that is induced by the laser beat to emit a density-regulated electron current; and an electron accelerator for accelerating the density-adjusted electron flow and generating a periodic bunched electron beam. The accelerator of claim 9, wherein the beat laser system further comprises a laser field, wherein the laser % has a fixed frequency offset Δω/ between two phases in a spectrum. 2π' is used to overlap the two laser fields to generate the laser beat wave, so that the laser beat wave has a beat frequency. The accelerator according to claim 9, wherein the beat wave laser The system further includes two linear frequency-frequency laser fields, and the two linear 26 200924567 song frequency laser fields have a relative time delay Δ, which is used for the two linear frequency-frequency laser fields and the shooting turbidity is right. seat The 射 射 射 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The frequency of the week is adjusted by the frequency of the beat. By changing the laser beat wave η to produce rr... The field shot knows to produce a laser beat wave. • If the application is turned over _ 13th rhyme = field in the spectrum The two-phase-to-phase-fixed frequency: partial == the laser beat has a beat frequency -1 range, the system described in item 14, and further includes -= pole =, where, when Μ, : conductor The mixing of the laser is generated, and the two semiconductors: the wavelength of the radiation is between one and the optical communication frequency =: Ray === the system described in item 14, wherein the system utilizes -order and -ρ = frequency is generated, and the nonlinear frequency η-order nonlinear optical material is mixed. Time: The system described in Item 13 of the circumference, wherein when the ">2 wave has a beat frequency, the current beat ^ △ △ makes the laser beat ' ° Λ beat frequency with the relative time delay △ 纟 and - 200924567 啾Adjusted by one of the frequency change rates. 18. The system of claim 17, further comprising a mode-locked laser source, wherein the two laser fields are separated by another linear frequency-frequency laser generated by the mode-locked laser source. 28