141results about "Solid masers" patented technology

Provided is a simple and compact configuration for performing optical processing on a terahertz wave. A terahertz light source (1) is provided with a lens (5) formed with a convex surface (6) for passing laser light, and a terahertz radiating layer (2) for radiating a terahertz wave on the basis of laser light. The terahertz radiating layer (2) comprises a non-magnetic layer (3) and a ferromagnetic layer (4) stacked on the non-magnetic layer (3). The terahertz radiating layer (2) is formed on the lens (5).

The invention provides a detection method of a flexible magnetic-field-free terahertz ultrafast light source and spin terahertz equipment. The detection method comprises the following steps: exciting an ultrafast terahertz light source device to generate an ultrafast terahertz pulse through a near-infrared ultrafast laser pulse, and detecting through a terahertz ultrafast spectrum. Meanwhile, a spinning THz source based on a transition metal oxide heterojunction without an external magnetic field, a flexible ultrafast spinning THz source based on inorganic substrate mica and a new method for widening the THz ultrafast pulse frequency domain width are achieved, and the spinning THz source which is low in energy consumption and practical is achieved.

The invention discloses a mechanical device capable of realizing three-dimensional motion of a magnetic array of a vacuum internal undulator, and the mechanical device comprises a layered supporting structure which comprises an upper-layer mounting plate and a lower-layer mounting plate which are superposed through an orthogonal linear guide rail; the three-dimensional movement mechanism comprises an x-direction movement mechanism, a y-direction movement mechanism and a z-direction movement mechanism; the anti-interference mechanism is used for separating the x-direction motion path from the z-direction motion path through sliding connection; the copper foil dynamic connecting mechanism is used for realizing continuous electric connection between the moving magnetic array and the static flange plate; wherein motion decoupling is achieved through the anti-interference mechanism, and the mechanical device can achieve linear motion of the magnetic array in the x direction, the y direction and the z direction. Through the three-dimensional motion mechanism, the anti-interference mechanism and the copper foil dynamic connection mechanism, the problems that a traditional undulator magnetic array is single in motion and copper foil is prone to breakage are solved, the adaptability, stability and precision of equipment are remarkably improved, and the undulator has important engineering application value.

The invention provides a terahertz generation chip based on a thin film lithium niobate platform and a preparation method of the terahertz generation chip, and belongs to the field of integrated optics and microwave photons. According to the chip, terahertz waves are generated by utilizing a second-order nonlinear difference frequency effect on thin-film lithium niobate, and phase matching of an optical field and a terahertz field is realized through parameter design of an optical waveguide structure of the lithium niobate layer and a terahertz waveguide structure of the silicon layer. The device comprises a nonlinear action layer, an isolation layer, a terahertz transmission layer and a substrate layer. Firstly, a silicon layer is thinned through a mechanical polishing process, then polytetrafluoroethylene is bonded to the bottom of the thinned silicon layer, finally, waveguide structure etching is carried out, a specific waveguide shape and size are constructed, and efficient generation and transmission of terahertz waves are achieved. The method has strong practical operability, and has wide application prospects in the fields of terahertz communication, spectroscopy, remote sensing and the like.

The present application relates to a kind of Cherenkov oscillator using composite fine adjustment magnetic field, the present application includes oscillator cavity and the composite fine adjustment magnetic field being arranged outside oscillator cavity, composite fine adjustment magnetic field includes positive solenoid external magnetic field and fine adjustment magnetic field system, fine adjustment magnetic field system is located between positive solenoid external magnetic field and oscillator cavity, fine adjustment magnetic field system includes first positive solenoid fine adjustment magnetic field, second positive solenoid fine adjustment magnetic field and negative solenoid fine adjustment magnetic field, oscillator cavity includes extraction cavity, extraction cavity is arranged with negative solenoid fine adjustment magnetic field outside, negative solenoid fine adjustment magnetic field is arranged with first positive solenoid fine adjustment magnetic field and second positive solenoid fine adjustment magnetic field outside respectively, the present application uses composite hetero solenoid magnetic field combination magnetic field model in magnetic field design and optimally designs, changes magnetic force line configuration, in turn changes electron beam running track.This kind of design guarantees the distance between electron beam and outer cavity, while using local magnetic field to change electron beam configuration method reduces the distance between electron beam and extraction cavity, improves microwave extraction efficiency.

The invention discloses a generating device of a surface electromagnetic wave radiation source, which can be applied to the technical field of electromagnetic waves. The plasma excitation unit is used for generating plasma, and the plasma acceleration unit comprises an electron acceleration power supply, a cathode end face, a slow wave circuit, a plurality of insulation spacers, a plurality of acceleration poles and an output end face. An electron beam channel is formed in the middle area of the upper surface of the slow wave circuit and the middle area of the lower surface of the cathode end face, the insulation spacers, the acceleration poles and the output end face, and meanwhile the insulation spacers and the acceleration poles are arranged between the cathode end face and the output end face at intervals. The speed of the plasma in the electron beam channel output by the plasma excitation unit is adjusted through the plasma acceleration unit, so that the electromagnetic wave radiation source under the target frequency, the target bandwidth or the target power can be output, and the electromagnetic wave radiation source with high frequency, wider bandwidth and high power can be obtained.

The invention discloses a phase coding optoelectronic oscillator with an adjustable duty ratio and an implementation method thereof, and relates to the technical field of photoelectricity. The optoelectronic oscillator comprises a laser, a Mach-Zehnder modulator, a single-mode fiber, a photoelectric detector, an electric amplifier, an electric band-pass filter and an electric power divider which are connected in sequence; a direct current port of the intensity modulator is connected with the function generator, one path of the electric power divider serves as output, and the other path is connected with a radio frequency port of the intensity modulator; the output voltage of the preset function generator jumps between the two linear bias points and the minimum bias point of the Mach-Zehnder modulator, so that the direct output of the phase-coded microwave signal with the adjustable duty ratio is realized. According to the invention, the coherence of the phase coding microwave signal is good, the phase noise is low, the duty ratio is adjustable, the coding flexibility is high, the structure is simple, and the equipment cost is low.

The invention provides a photoelectric oscillator capable of being used for frequency hopping microwave generation. The photoelectric oscillator is mainly composed of a laser, a polarization controller, a Mach-Zehnder modulator, a single-mode optical fiber, a photoelectric detector, an electric amplifier, a frequency mixer, an equivalent dual-band filter and a microwave source. Wherein the equivalent dual-band filter is obtained by connecting two narrow-band filters in parallel and serves as a frequency selection device of the optoelectronic oscillator system; hopping is carried out on the loop signal by utilizing the frequency mixer, so that frequency hopping of the loop signal is realized; compared with a traditional scheme, the system has a simpler system structure, the equivalent dual-band filter and the frequency mixer are utilized to enable a photoelectric oscillator loop to continuously perform frequency hopping and conversion, frequency hopping signal generation with loop time delay as a half cycle is realized, and the system has good application in the aspects of signal generation, pulse detection and the like.

This invention discloses a low-phase-noise arbitrary waveform generation system based on an injection-locked optoelectronic oscillator. It utilizes a dual-polarization Mach-Zehnder modulator to simultaneously realize the injection-locked optoelectronic oscillator and optical domain frequency quadruple, enabling simultaneous microwave signal generation and signal frequency multiplication. The frequency bandwidth of the generated signal is not limited by the injected signal, thus realizing the generation of ultra-wideband signals.

A principle which enables the generation of macroscopic Fock and sub-Poissonian states is disclosed. Generic components of the system include: an electromagnetic structure (possessing one or more electromagnetic resonances), a nonlinear electromagnetic element (such as a nonlinear crystal near or inside the structure), and a source of light. In one embodiment, stimulated gain is used to create large numbers of photons in a cavity, but with very low photon number noise (uncertainty) in the cavity, and thus acts as a Fock laser. This Fock laser is capable of producing these states due to a very sharp intensity-dependent gain (or loss) that selects a particular photon number. The disclosed system and method are robust against both atomic and optical decoherence. Various examples of the new Fock laser design are also described.

This application relates to the field of terahertz emission, specifically providing a low-frequency terahertz emitting device and its fabrication and usage methods. The device includes an excitation material, which is a heterojunction formed by a perovskite layer and a high-resistivity silicon layer. It also includes a first metal layer disposed outside the perovskite layer and a second metal layer disposed outside the high-resistivity silicon layer. During fabrication, a perovskite solution is first spin-coated onto the high-resistivity silicon to form a perovskite layer, and finally, the metal layers are deposited by vapor deposition. During use, a femtosecond laser is incident from one side of the perovskite layer, and a voltage is applied between the first and second metal layers. The applied electric field of this application enhances the interfacial band bending and widens the depletion layer, while simultaneously forming a stable potential gradient in the thickness direction. This makes the transient current change smoother, increases the time constant, and reduces the rate of change of the transient current over time, thereby increasing the proportion of the low-frequency terahertz component and achieving enhanced low-frequency radiation.

The invention provides a terahertz generation and radiation device based on a double-ellipse conical groove antenna, which mainly comprises a terahertz generation part and a terahertz radiation part, and different device units in the terahertz generation part are used for generating terahertz based on two received light waves with different phase differences. Converting two beams of light waves with a specific phase difference into terahertz waves by using a light wave difference frequency effect, wherein the terahertz waves inherit the phase difference of the light waves; and the terahertz radiation part is used for radiating the terahertz waves to a free space so as to realize beam steering of the terahertz waves in a far field. Furthermore, the invention also discloses a terahertz phased array system. According to the invention, wide-angle and grating lobe-free scanning of terahertz wave beams can be realized, and a large-scale array can be realized.

To provide a high-output high-frequency generator having a simple configuration.SOLUTION: A high frequency generator (10) of the present invention includes a photoelectric conversion layer (11) that generates electrons by photoelectric conversion, an electron transit layer (101) that allows electrons to transit in the photoelectric conversion layer, an anode layer (12) that is disposed in contact with the electron transit layer and is made of a semiconductor, an anode electrode layer (13) that is disposed in contact with the anode layer and is made of a metal, and an antenna (14) that radiates terahertz waves based on an alternating current generated by the transit of electrons.SELECTED DRAWING: Figure 1

The present application relates to a kind of novel spin terahertz emitter and its regulation method, and spin terahertz emission structure includes: electrode, and by sequentially arranged substrate layer, first topological material layer, first ferromagnetic material layer, barrier layer, second topological material layer and second ferromagnetic material layer from bottom to top, first, second topological material layer includes topological insulator and topological semimetal, electrode is used to input current to the first topological material layer.New regulation method of novel spin terahertz emitter includes: by electrode, input current to the first topological material layer, by changing the polarity and size of current, change the magnetic moment direction of first ferromagnetic material layer, and then switch superfast regulation to spin terahertz, enrich the type of prior art in spin terahertz emitter and the regulation means of spin terahertz switch.

The present application relates to a kind of terahertz emitter and its amplitude regulation method, belong to terahertz regulation field, the terahertz emitter includes from bottom to top sequentially stacked substrate, ferromagnetic layer, non-ferromagnetic layer and antiferromagnetic layer, or including from bottom to top sequentially stacked substrate, antiferromagnetic layer, non-ferromagnetic layer and ferromagnetic layer, can be changed by the direction of applied magnetic field, applied current or applied electric field to the amplitude regulation of above-mentioned terahertz emitter, to change the direction of applied magnetic field, applied current or applied electric field to the amplitude regulation of above-mentioned terahertz emitter, so that the present application designs a kind of terahertz emitter of new structure, and corresponding amplitude regulation method is designed for the terahertz emitter, can realize the efficient regulation of terahertz amplitude.

The invention belongs to the technical field of microwave photons, and provides a double-ring photoelectric oscillator and a stabilizing method thereof. The oscillator is provided with a long ring and a short ring and comprises a stabilizing device; the stabilizing device comprises a first piezoelectric ceramic optical fiber stretcher, a motor space light delay line and a second piezoelectric ceramic optical fiber stretcher; generating two optical probe signals; the first optical probe signal is converted into a first electric probe signal through the long ring; a second optical probe signal is converted into a second electric probe signal through the short ring; an electric probe signal is output after being subjected to detection, coupling and power division; the two frequency mixers respectively carry out homodyne frequency mixing on the electric probe signal and the phase-shifted and non-phase-shifted radio frequency signals to generate a zero-frequency error signal; the two phase-locked loops generate compensation control signals according to the error signals; the control signal adjusts an optical fiber delay line; the stability of the two loops is ensured, the problem of combined signal frequency drift caused by neglecting short-loop delay change is solved, the coherence requirement on optical signals is avoided by electric domain combination, and smooth tuning of the output radio frequency signal frequency is realized.

The application discloses a method for regulating Brillouin gain, a laser and an optical microwave source, and specifically relates to the method for regulating Brillouin gain. a The application discloses a method for regulating Brillouin gain, a laser and an optical microwave source, and specifically relates to the method for regulating Brillouin gain. The method for regulating Brillouin gain adopts the gradual change of the angle between the circular light path and the crystal axis, so that the speed of the generated acoustic phonon is continuously changed, and then the widened backward Brillouin gain feature is generated, the threshold of the backward Brillouin laser is reduced, the linewidth of the Brillouin laser is reduced in one step, and the diversity of the Brillouin laser application is increased.

The application discloses a kind of methods for realizing cylindrical grating coherent Smith-Purcell radiation enhancement, Smith-Purcell radiation is a kind of incoherent spontaneous radiation, the power of radiation is very low, not easy to detect and application, to realize high intensity Smith-Purcell radiation, the application proposes based on quasi-continuous domain bound state enhancement method.First, the electron bunch string is generated using the electron gun;Then, make the electron bunch string pass through the surface of cylindrical metal grating, the repetition frequency of electron bunch string is used as the resonance frequency of quasi-continuous domain bound state, to realize the enhancement of coherent Smith-Purcell super-radiation, and finally the electron enters the collecting electrode.The cylindrical grating coherent Smith-Purcell radiation enhancement method proposed in the application is simple to operate, and has obvious effect, easy integration, low cost and other characteristics.

The invention provides a photoelectric oscillator capable of being used for generating tunable phase coding microwave pulses. The photoelectric oscillator is composed of a tunable laser, a polarization controller, a phase modulator, a dual-drive Mach-Zehnder modulator, an optical circulator, a phase shift fiber bragg grating, a single-mode fiber, a photoelectric detector, an electric amplifier, a microwave source and an arbitrary waveform generator. The invention develops the active mode-locked photoelectric oscillator for generating the phase-coded microwave pulse signal, which is simple in structure and good in tunability. On the basis of an active mode-locked optoelectronic oscillator, a phase modulator is driven by a phase coding signal, so that the duration of each voltage polar code is kept consistent with the loop delay of the optoelectronic oscillator, and a phase-coded coherent microwave pulse sequence is generated. The signal has the advantage of large time bandwidth product, can give consideration to the detection distance and distance resolution of the radar, and has the characteristics of interference resistance, low interception and the like.

An optoelectronic oscillator (100) and a signal processing method, which relate to the technical field of optoelectronics. In the optoelectronic oscillator (100), an electro-optical modulator (110), an optoelectronic detector (120), a first filter (130) and a power divider (140) form an optoelectronic oscillation loop. Compared with a conventional single-passband filter, the first filter (130) in the optoelectronic oscillation loop has an additional low-frequency passband, and thus can excite a pulse train of the low-frequency passband and a pulse train of a bandpass band in the optoelectronic oscillation loop. Since the oscillation of a pulse signal can automatically narrow a pulse train to form an ultrashort pulse train, when the pulse train excited by the bandpass band has undergone pulse narrowing by means of an oscillation mechanism in the optoelectronic oscillation loop, the pulse train excited by the low-frequency passband may further undergo pulse narrowing, such that the optoelectronic oscillator (100) can generate a microwave pulse train which is shorter than that of a conventional optoelectronic oscillator, that is, an ultrashort microwave pulse train.

The invention belongs to the field of all-solid-state ultrafast laser, and discloses a GHz repetition frequency high-power femtosecond green light and ultraviolet laser generation device and method, and the method comprises the steps: a pumping source outputs fundamental frequency femtosecond laser with the repetition frequency greater than 1GHz; generating femtosecond green light from the fundamental frequency femtosecond laser through a frequency doubling effect; splitting the residual femtosecond laser and the frequency doubling femtosecond green light in the emergent light of the first frequency doubling crystal to obtain a residual femtosecond laser light path and a femtosecond green light path which are parallel to each other; adjusting the time delay of the transmission process of the residual fundamental frequency femtosecond laser to enable the time delay to coincide with the femtosecond green light time in the femtosecond green light path; combining the emergent light of the remaining femtosecond laser light path and the emergent light of the femtosecond green light path; and performing sum frequency on the residual fundamental frequency femtosecond laser and the femtosecond green light after beam combination to generate ultraviolet femtosecond laser. According to the invention, femtosecond green light output with GHz repetition frequency and high output power and ultraviolet femtosecond laser output with GHz repetition frequency and high output power are realized at the same time.

To realize an atomic oscillator with high accuracy which is small in size and low in power consumption.SOLUTION: An oscillation module 10 includes a substrate 11 having complex defects of impurities and vacancies, a plurality of electrodes 13 provided on the substrate 11 and generating an electric field by applying a voltage, a light source 17 that irradiates the substrate 11 with excitation light that excites the complex defects, and a photodetector 4 that detects fluorescence emitted from the substrate 11. By using such an oscillation module 10, an atomic oscillator 1 with high accuracy which is small in size and low in power consumption can be realized.SELECTED DRAWING: Figure 2

This invention discloses a self-focusing vortex spin terahertz transmitter and its application, comprising a glass substrate, a spin terahertz thin film, and a magnet pair. The spin terahertz thin film is composed of a ferromagnetic material layer, a heavy metal non-magnetic material layer A, and a heavy metal non-magnetic material layer B. The ferromagnetic material layer is disposed on the upper surface of the glass substrate, and the heavy metal non-magnetic material layers A and B are arranged in a spiral alternating pattern on the outer surface of the ferromagnetic material layer. This invention has a simple structure. By fabricating two specially arranged heavy metal non-magnetic material layers with equal and opposite spin Hall angles on the ferromagnetic material, a spiral spin terahertz Fresnel zone plate is constructed, enabling the generated vortex spin terahertz waves to have a focusing function, thereby improving the integration of the vortex spin terahertz transmitter.

The invention discloses a light guide microwave device for synchronously triggering a non-coplanar electrode parallel structure and a preparation method, which mainly solve the problem of low output power of the existing light guide device at high frequency, and comprises a light guide device (10), an anode connecting electrode (7) and a cathode connecting electrode (1). The photoconductive device is formed by vertically stacking two substrates (3, 8), and one end of the photoconductive device is provided with a groove; one end of the anode connecting electrode is connected with the two ohmic contact anodes (5 and 6) in the groove, and the other end of the anode connecting electrode is connected with an external circuit; the cathode connecting electrode is provided with three ports, the upper port and the lower port of the cathode connecting electrode are connected with the two ohmic contact cathodes (2 and 4) on the photoconductive device respectively, and the whole exterior of the cathode connecting electrode is packaged through an insulating shell (9). The two substrates can be conducted at the same time under irradiation of the same laser beam, the conduction delay after device cascading is reduced, the light energy utilization rate of the light guide device is improved, high-power output under high frequency is achieved, and the light guide device can be used for high-power systems such as accelerators, radars and high-power microwave sources.

The invention provides a method and a device for exciting terahertz magnetons by an electric field. The method comprises the following steps: applying an electric field to a pre-constructed magneton generator to instantaneously jump voltage from a first value to a second value; in the jump process, a magnetic domain wall area in the magneton generator excites THz spin waves which take a domain wall as a center and are symmetrically propagated to two sides. According to the invention, the discontinuous changing electric field is applied to the magneton generator, so that THz spin waves are excited in a magnetic domain wall area, the risk of thermal damage caused by high-energy laser or large current is avoided, low-energy-consumption and high-efficiency excitation is realized, and meanwhile, due to the fact that an electric field regulation and control mode has the characteristics of high controllability and easiness in local modulation, the THz spin waves can be excited in the magnetic domain wall area. The technology can realize dynamic regulation and control of magneton frequency and amplitude, thereby providing a more convenient, reliable and efficient new method for integration and design of high-frequency spinning electronic devices.

The object of the present invention is to provide a device for generating high-power terahertz waves based on triple-optimized cascaded difference frequency, which includes a first pump source, a second pump source, a third pump source and a fourth pump source, a first APPLN crystal, a second APPLN crystal and a third APPLN crystal with different polarization period distributions, a first parabolic mirror, a second parabolic mirror, a third parabolic mirror, a first beam combiner, a second beam combiner, a third beam combiner, and a phase delay system; it can generate multiple terahertz waves with the same frequency simultaneously, improving the terahertz wave conversion efficiency. By setting the distribution of the polarization period of the APPLN crystal, the Stokes cascaded difference frequency can be enhanced while suppressing the anti-Stokes cascaded difference frequency, improving the terahertz wave optical conversion efficiency.

The invention belongs to the technical field of microwave photons, and provides a double-ring photoelectric oscillator with a stabilizing device and a stabilizing method thereof, the double-ring photoelectric oscillator is provided with a long ring, a short ring and a stabilizing device; the stabilizing device comprises a first piezoelectric ceramic optical fiber stretcher and a motor space light delay line; the radio frequency signal source generates a first optical probe signal and a second optical probe signal through modulation; the first optical probe signal is converted into a first electric probe signal after passing through the long ring; a second optical probe signal is converted into a second electric probe signal after passing through the short ring; the first frequency mixer and the second frequency mixer are used for performing homodyne frequency mixing on the electric probe signal and the radio frequency signal to generate a zero frequency error signal; and the two phase-locked loops generate compensation control signals according to the zero-frequency error signals. According to the invention, by outputting the control signal and adjusting the optical fiber delay line, the stability of two loops is ensured, the problem of combined signal frequency drift caused by neglecting short-loop delay change is solved, and the coherence requirement on two paths of optical signals is avoided by electric field combination.

The invention provides a self-starting Fourier domain mode-locked optoelectronic oscillator and a method. The oscillator comprises a sweep-frequency light source used for generating sweep-frequency light with the wavelength changing along with time; the photoelectric oscillation loop comprises a phase modulator, a long optical fiber, a notch filter, an optical detector and an electric amplifier, and the output end of the optical detector is connected with the input end of the phase modulator through the electric amplifier to form a closed loop; the sweep frequency light generates a carrier wave and two sidebands through phase modulation, a notch filter filters one sideband, and residual optical signals are converted into microwave signals through an optical detector after being delayed in a long optical fiber and are fed back to a phase modulator through electric amplification; the microwave power detector monitors loop output power in real time; the control unit adjusts the sweep frequency period of the sweep frequency light source according to the monitoring result, searches and locks a target period enabling the microwave signal power to be maximum, and achieves the self-starting of Fourier domain mode locking.

To provide a high-output high-frequency generator having a simple configuration.SOLUTION: The high frequency generator (10) is provided with a voltage generation part (12) for generating a voltage by the irradiation of feed light, a photodiode (11) for generating electrons by the photoelectric conversion of signal light and converting the electrons into a current by the voltage, and an antenna (13) for radiating radio waves on the basis of the current. The high frequency generation device may include a vacuum package (14), and the voltage generation unit, the photodiode, and the antenna may be provided in the vacuum package.SELECTED DRAWING: Figure 1

The invention relates to the technical field of terahertz generators, in particular to a terahertz wave generator of a carbon nanotube-graphene heterojunction cold cathode, which comprises a contact part, a displacement device is slidably mounted at the side end of the contact part, and a heat dissipation fan is fixedly mounted at the top end of the contact part. The displacement device comprises a terahertz wave generator, connecting rods and a matching plate, the connecting rods are symmetrically and fixedly installed at the top end of the terahertz wave generator, the terahertz wave generator is fixedly installed at the side end of the matching plate, and the contact component comprises a butt joint device, a cleaning device, a shunting device, a positioning device and a supporting substrate. The positioning device is fixedly installed at the top of the side end of the supporting base plate, the flow dividing device is fixedly installed at the top end of the positioning device, and the butt joint devices are slidably installed on the two sides of the positioning device. Through the arrangement of the displacement device and the contact device, the purpose of integrating rapid installation and rapid cooling of the terahertz wave generator is achieved.