51 results about "Chirp pulse" patented technology

The invention provides a mid-infrared optical frequency comb. The mid-infrared optical frequency comb comprises a near-infrared optical frequency comb seed source of a polarization-maintaining all-fiber structure; the all-fiber nonlinear amplification and pulse compression module is connected with the near-infrared optical frequency comb seed source through a polarization maintaining fiber and is used for amplifying the power of the seed light and compressing the pulse width after generating a linear chirped pulse; the all-fiber nonlinear spectrum broadening module is connected with the all-fiber nonlinear amplification and pulse compression module through a polarization maintaining fiber and is used for broadening a laser spectrum; the difference frequency module is used for receiving the laser pulse processed by the all-fiber nonlinear spectrum broadening module and generating an intermediate infrared laser pulse through intra-pulse self-difference frequency; wherein the seed source, the all-fiber nonlinear amplification and pulse compression module and the all-fiber nonlinear spectrum broadening module are connected through a polarization maintaining fiber to form an all-fiber integrated structure. By adopting the scheme, the anti-interference capability of the system can be enhanced, miniaturization and high operation reliability are realized, the debugging process is simplified, and the difference frequency efficiency is improved.

The invention relates to the technical field of digital-to-analog conversion, in particular to a large-dispersion compact chirped pulse time domain compression method, which comprises the following steps of: projecting a broadened chirped pulse to a first grating in an inclined incidence mode, and moving adjacent back and forth diffraction spots point by point in a direction parallel to a grating scribed line; the first grating and the second grating are oppositely arranged in parallel to form a double-grating group; controlling the chirped pulse to perform multiple back-and-forth diffraction between the first grating and the second grating to obtain a preset large dispersion amount; an angular dispersion steering module is arranged on a back-and-forth diffraction light path of the chirped pulse, and vertical angular dispersion introduced due to oblique incidence is turned into horizontal angular dispersion. An angular dispersion compensation module is arranged on a light path before the chirped pulse is output, and the angular dispersion accumulated by multiple back-and-forth diffraction is offset and compensated. According to the method, on one hand, the dispersion amount several times that of a traditional pulse time domain compressor can be obtained, on the other hand, the compact design of the structure of the compressor can be achieved, and the method has important engineering application value.

The invention discloses a chirped pulse Fourier transform microwave spectrometer and a detection method, and belongs to the technical field of microwave spectrums.The chirped pulse Fourier transform microwave spectrometer comprises a pulse sample introduction and reactant in-situ generation system, a segmented chirped pulse generation and radiation system, a signal detection and high-speed acquisition system, a synchronous time sequence control system and a signal processing and automatic acquisition assembly. According to the chirped pulse Fourier transform microwave spectrometer and the detection method, 18-40 GHz continuous broadband coverage is realized through a segmented chirped pulse sequence, and a pulse discharge sampling system is integrated, so that high-reaction-activity intermediates and molecular clusters thereof can be generated and directly detected in situ; the technical blank of a broadband high-sensitivity microwave spectrometer with the frequency band of 18-40 GHz is filled, and a powerful tool is provided for research on structures and reaction kinetics of key transient species in atmospheric chemistry, combustion chemistry and celestial chemistry.

A system and method for distributed temperature and strain sensing using Chirp-Pulse Coherent Optical Time-Domain Reflectometry (CP-COTDR) utilizes optical flow processing. The method involves constructing a two-dimensional (2-D) waterfall data array from collected CP-COTDR frames. Optical flow processing is applied directly to the 2-D data to estimate the local shift of features caused by external perturbations. The optical flow is preferably calculated using a weighted least squares method with an adaptive analysis window based on the local flatness of signal derivatives. This approach provides versatile and high spatial resolution, reduces accumulative errors, and enables efficient data processing compared to conventional cross-correlation techniques.

The application provides an X-ray ultrafast imaging system and method based on radiation conversion and spectral filtering, which solves the problems of poor universality, low time resolution or limited number of frames in existing X-ray ultrafast imaging technology. The system comprises an X-ray coupling module for coupling target X-ray signals to image on a semiconductor chip module, a semiconductor chip module for converting the X-ray intensity space-time distribution into the chip refractive index space-time distribution, a chirped pulse light generation module, a chirped pulse light coupling module for irradiating linear chirped pulse light generated by the chirped pulse light generation module to the semiconductor chip module and coupling the pulse light reflected by the semiconductor chip module into a phase extraction module, the phase extraction module, a spectral filtering frame reading module for imaging the linear chirped light intensity space-time distribution signal output by the phase extraction module into the data acquisition module, the data acquisition module and an image processing module for processing the image output by the data acquisition module.

Described are techniques for interleaving range and Doppler radar processing. A data cube is memory accessed differently, from one look period to the next, which allows Doppler processing for a current look period to happen in parallel with range processing for a next look period. Range processing for a first look period writes to rows of the data cube; Doppler processing reads from and empties its columns. But before Doppler processing can finish, a second look period begins. Rather than re-writing to the rows, range processing in the second look period writes to the columns just emptied by the ongoing Doppler processing. Doppler processing for the first look period is allowed to finish by executing during processing idle times in the second period, e.g., in-between chirps. With better processor utilization, Doppler processing is afforded more time to do its complex operations, while keeping look periods as short as possible.

An off-axis single-grating multi-pass pulse compressor disclosed by the present invention comprises a compression module and at least one group of mirror groups, the mirror groups are used for increasing dispersion compensation of the compression module, and the compression module comprises a D-shaped reflector, a grating, a plane reflector, a first horizontal mirror and a first high-low mirror. Each group of mirror group comprises two mirrors, one mirror of each group of mirror group is located at the laser output end of the compression module, and the other mirror of each group of mirror group is located above the first high-low mirror, or the other mirror of each group of mirror group is located above the second high-low mirror. And the other mirror of each mirror group is positioned on one side of the first high-low mirror and has the same height with the horizontal plane. According to the off-axis single-grating multi-pass pulse compressor, a multi-pass single-grating compressor can be achieved, the total dispersion compensation amount is greatly increased, the advantages of low cost and small size of a transmission-type single-grating compressor can be reserved, and the compression requirement of ultra-large chirped pulses can be met.

The embodiment of the present application relates to the technical field of ultra-high-speed imaging, and discloses a framing imaging device, which comprises a chirp spreading element, a diffraction element, a first Fourier lens, a framing element and a second Fourier lens, wherein the chirp spreading element is used for spreading incident light and emitting chirp pulse light; the diffraction element is used for splitting the chirp pulse light into diffraction beams propagating in different directions; the first Fourier lens is used for emitting the incident diffraction beams into central-symmetrical array beams; the framing element is used for framing the array beams into delay beams; and the second Fourier lens is used for converging the delay beams to the same illumination area. The present application also discloses a framing imaging system. The present application solves the technical problem of how to simplify the structure of a conventional framing imaging device under the premise of the same time resolution.

The invention belongs to the technical field of lasers, and particularly relates to a dynamic dispersion compensation system and method for an intermediate infrared tunable fiber laser, and the system comprises an intermediate infrared ultrashort pulse light source mechanism which is used for outputting negative chirped pulse laser with the wave band of 2.8-4.5 microns; the pulse compression module comprises a transmission grating I and a transmission grating II which are arranged in parallel, an aberration removal structure positioned between the transmission grating I and the transmission grating II, and a roof prism; the negative chirped pulse laser sequentially passes through the first transmission grating, the aberration removing structure and the second transmission grating and then enters the ridge prism, and the negative chirped pulse laser is reflected by the ridge prism to enable the light to sequentially pass through the second transmission grating, the aberration removing structure and the first transmission grating and then outputs near Fourier transform limit pulsed light. The distance between the plane where the first transmission grating is located and the plane where the second transmission grating is located is the grating distance. And the grating distance is adjusted through the distance adjusting part. According to the invention, dynamic dispersion compensation of the mid-infrared band can be realized.

The invention provides a broadband response distributed sound wave sensing method and device, and relates to the technical field of optical fiber sensing. Single-frequency continuous light beams are split, double-sideband frequency sweep modulation is performed on a first path to generate double-sideband frequency sweep light, short-pulse-width chirped pulse light and long-pulse-width chirped pulse light are obtained through frequency band selection and pulse interception, and the short-pulse-width chirped pulse light and the long-pulse-width chirped pulse light are synthesized and injected into a sensing optical fiber; backward Rayleigh scattering light signals are collected, long-pulse-width and short-pulse-width Rayleigh scattering light signals are separated through optical filtering, and spontaneous emission noise is suppressed and amplified; coherent beat frequency detection and phase demodulation are carried out on the long-pulse-width Rayleigh scattering light signal, spectrum correlation processing is carried out on the short-pulse-width Rayleigh scattering light signal to obtain time offset, disturbance information recovery is achieved, and a sound wave measurement result distributed along the sensing optical fiber is output.

The invention relates to the technical field of femtosecond pulse measurement, in particular to a dispersion scanning pulse self-measurement method based on a chirped pulse amplification laser, which comprises the following steps of: jointly using a stretcher and a compressor which are arranged in the laser as a dispersion scanning system, and adopting a dispersion scanning coordination strategy; continuously adjusting the dispersion amount of the stretcher and the dispersion amount of the compressor, synchronously collecting second harmonic spectrum signals under different dispersion distribution combinations, and constructing a second harmonic spectrum track diagram; according to the method, an adaptive dispersion coupling phase reconstruction algorithm is adopted, iteration processing is conducted on a second harmonic frequency spectrum track diagram, a high-order dispersion compensation item is introduced for optimization, the time domain intensity and phase information of laser pulses are reconstructed, the optimal dispersion compensation amount is determined, and the narrowest pulse width value is output. Therefore, the precision of pulse phase and width measurement and the convergence speed of the algorithm are improved.

Single-sided MRI scanners, systems, and methods are disclosed. A method can include applying a first sweeping frequency pulse defining an X axis; applying a second sweeping frequency pulse defining a Y axis; applying a third sweeping frequency pulse defining the Y axis; and applying a fourth sweeping frequency pulse defines a −X axis. The sweep rate of the fourth sweeping frequency pulse can be less than the sweep rate of the third and / or second sweeping frequency pulse. The sweeping frequency pulses can be chirp pulses. Frequency sweep DEFT pulse sequences can provide the benefits of a broader bandwidth and less sensitivity to the inhomogeneity of a single-sided MRI scanner.

Single-sided MRI apparatuses, systems, and methods are disclosed. A method can include transmitting a frequency sweep excitation pulse comprising a low-to-high frequency sweep; phase encoding during the frequency sweep excitation pulse; and tuning the amount of phase accumulated during the frequency sweep excitation pulse from adjacent slices in the slab. The frequency sweep excitation pulse can be a chirp pulse. Encoding in this way can prevent spin echoes from drifting and prevent k-space truncation in certain instances. Moreover, the resultant images can be combined more efficiently.

The utility model relates to four program femtosecond laser compressor, through the light of first time through the compressor output is injected into the compressor for many times, incident chirp pulse is along the compressor light path and is emitted four times, total transmission grating 8 times, finally through the output mirror output completes compression output, make the number of times of light beam through grating increase to 16 times, make the same grating aperture and grating spacing compressor dispersion quantity turn 4 times, adapt to bigger spread width or bigger bandwidth chirp pulse amplifier, many times repeat, expand the use number of times of compression grating, obtain bigger compression under the condition that the grating spacing of compressor is unchangeable, can be compatible with bigger spread width of chirp pulse amplifier, solve the problem of design limit of chirp pulse amplifier, promote femtosecond laser output single pulse energy.

The invention, which relates to the technical field of ultrafast laser, discloses a multi-disc multi-pass ultrafast laser amplification system comprising a first grating assembly, a first laser adjustment assembly, a multi-disc gain assembly, a second laser adjustment assembly and a second grating assembly which are arranged in sequence. A plurality of disc crystals of the multi-disc gain assembly are arranged at equal intervals to form a gain area; the first laser turn-back mirror and the second laser turn-back mirror are oppositely arranged on two sides of the multi-disc gain assembly and are used for reflecting the pulse laser distributed in the strip shape for multiple times to pass through a gain area of the multi-disc gain assembly; the first pump light coupling mirror and the second pump light coupling mirror are oppositely arranged on the two sides of the multi-disc gain assembly and used for coupling the input collimated rectangular pump light to a gain area of the multi-disc gain assembly. The first grating assembly and the second grating assembly form a chirped pulse compressor. According to the invention, the problem that the laser and the pump light are difficult to fully realize spatial overlapping in a gain region is solved, and the energy of the laser amplifier is effectively extracted.

This invention discloses an attosecond-level delay diagnosis method between electron beams and pulsed lasers, belonging to the technical field of delay diagnosis between electron beams and pulsed lasers. The method includes: adjusting the delay between a chirped pulsed laser a and a chirped electron beam b via a delay device; recording the positions of the delay devices corresponding to the appearance and end of the transverse modulation of the electron beam on an electron spectrometer to obtain the transverse modulation and energy spectrum of the chirped electron beam b; obtaining the chirped distribution of the chirped electron beam b using an electron beam chirped diagnostic reconstruction method based on laser transverse modulation of the electron beam; obtaining the angular distribution of the chirped electron beam b in the spatial domain based on [variable name missing]; determining the positive or negative value of the delay; performing a spatial domain Fourier transform on the angular distribution of the chirped electron beam b in the spatial domain; and further calculating the delay difference between the chirped electron beam b and the chirped pulsed laser a. This invention can diagnose attosecond-level delays between electron beams and pump pulses; the device is simple; and it has good scalability, extending to any wavelength band.

The invention relates to the technical field of ultrafast laser, and discloses a pumping intensity optimization method of a laser, equipment and a medium. The method comprises the following steps: carrying out graded pumping design, and pre-amplifying signal light output by a mode-locked fiber oscillator by adopting a single-mode laser diode; the method comprises the following steps: establishing a mathematical model of pumping power and gain fiber length, and when the pumping power is increased from low power to preset power, adjusting the chirp amount of a chirp fiber grating through a temperature tuning device, and performing pre-chirp management on signal light input into a multimode gain fiber; under high pumping intensity, the initial chirp amount of signal light is optimized, so that the signal light entering the multimode gain optical fiber is in a negative chirped pulse state, the self-phase modulation and dispersion effect of the signal light when the signal light is amplified in the multimode gain optical fiber is balanced, and the stimulated Raman scattering and self-focusing phenomena are avoided; and the compressed pulse width is used as a feedback signal to realize the optimal matching of the signal light energy and the pulse width.

The application discloses a chirp pulse stretching and compressing device and an amplification system, and relates to the field of lasers. The chirp pulse stretching and compressing device comprises a first polarization beam splitter prism, a pulse stretching and compressing device and a dispersion regulator. The chirp pulse stretching and compressing device has a stretching port and a compressing port arranged oppositely, is divided into a stretching light path part and a compressing light path part, the two light path parts share one main stretching and compressing module, and the stretching light path part is additionally provided with a dispersion regulator to provide adjustable and additional dispersion compensation. The chirp pulse stretching and compressing device provided by the application can be flexibly adapted to different amplification systems, so that the output light pulse reaches near-zero chirp and ultra-short pulse width is realized.

The invention discloses a distributed optical fiber sensing system based on four-frequency chirp modulation. The distributed optical fiber sensing system comprises a narrow linewidth laser module, a signal modulation module, a filling light modulation module, a coherent detection module and a signal demodulation and noise reduction module. Laser generated by the narrow linewidth laser is divided into probe light and local oscillator light through the polarization-maintaining coupler, the probe light passes through the signal modulation module to obtain a four-frequency multiplexing chirped pulse signal, the signal enters the filling light modulation module to obtain an amplified four-frequency chirped pulse signal, the amplified signal is sent to the sensing fiber to excite backward Rayleigh scattering light, and the laser is sent to the local oscillator light to be subjected to optical fiber laser scanning. The scattered light is sent to a coherent detection module to be subjected to beam combination interference with local oscillation light and then converted into a Rayleigh scattering analog electric signal, and the electric signal is sent to a GPU to be subjected to four-frequency chirp signal phase demodulation and noise reduction processing. According to the invention, pulse square wave distortion suppression in the light amplification process is realized, demodulation and noise reduction processing are carried out based on the GPU while long-distance and high-resolution distributed sensing is ensured, and real-time detection and sensing of high-frequency sound wave vibration signals are realized.

The invention provides a phase delay self-compensating vector polarized light parametric chirped pulse amplifier which comprises a narrow-band pulse laser, a broadband pulse laser generating device, a half-wave plate, a polarization beam splitter, a pulse stretcher, a laser mode converter, a first nonlinear crystal, a second nonlinear crystal and a pulse compressor. The phase delay introduced by the second-stage optical parameter chirped pulse amplification to the two orthogonal polarization components of the vector polarization signal light is used for counteracting the dynamic phase delay accumulated in the first-stage optical parameter chirped pulse amplification process. The objective of the invention is to solve the problem of polarization distortion of vector polarized light caused by different accumulated phase delays of all frequency components in the optical parameter chirped pulse amplification process, so that the vector polarized light can obtain broadband high-gain amplification while the initial polarization characteristic of the vector polarized light is kept unchanged. Vector polarized light parametric chirped pulse amplification with high polarization purity and high peak power is realized.

The application discloses a kind of high spatial resolution detection device and method based on hyperspectral, wherein, high spatial resolution detection device includes X-ray response module, detection light generation module, synchronous control system, imaging recording module and calibration light path.Detection light generation module generates chirp pulse as detection light;X-ray response module makes X-ray and semiconductor response medium interact, and the space distribution change of the time-space evolution process of X-ray is converted into carrier concentration in semiconductor response medium;Imaging recording module includes imaging system and hyperspectral resolution camera, and the action area of semiconductor response medium is imaged to hyperspectral resolution camera.Under single exposure, multiple high time resolution (femtosecond to picosecond order) two-dimensional X-ray images are obtained, time resolution is adjustable, spatial resolution is high, system structure is simple, cost is low, efficiency is high, anti-interference ability is strong, suitable for X-ray time-space diagnosis in laser fusion and high energy density physics research.

To provide single-sided MRI apparatuses, systems and methods.SOLUTION: A method includes: transmitting a frequency sweep excitation pulse comprising a low-to-high frequency sweep; phase-encoding during the frequency sweep excitation pulse; and tuning the amount of phase accumulated during the frequency sweep excitation pulse from adjacent slices in a slab. The frequency sweep excitation pulse can be a chirp pulse. Encoding in this way can prevent spin echoes from drifting and prevent k-space truncation in certain instances. Moreover, the resultant images can be combined more efficiently.SELECTED DRAWING: Figure 13

The present disclosure provides a spectrum measurement method, a spectrum measurement system and an electronic device. The spectrum measurement method comprises: obtaining a linear chirp signal, and dividing the linear chirp signal into two orthogonal first and second linear chirp signals; obtaining a to-be-detected signal, and obtaining a measurement complex chirp pulse signal according to the to-be-detected signal, the first linear chirp signal and the second linear chirp signal; obtaining a reference signal, and obtaining a reference complex chirp pulse signal according to the reference signal, the first linear chirp signal and the second linear chirp signal; wherein the reference signal is used to calibrate the spectrum information of the to-be-detected signal; and performing cross-correlation operation on the reference complex chirp pulse signal and the measurement complex chirp pulse signal, and determining the spectrum information of the to-be-detected signal according to the result of the correlation operation.

The invention discloses a space-time wave packet modulation signal generation and anti-turbulence optical communication device, belongs to the technical field of optical systems, and aims to solve the problems in the prior art. The device comprises a 1530nm laser, an electro-optical modulator, a signal generator, an erbium-doped fiber amplifier (EDFA), a first polarization isolator, a 1530nm / 1625nm wavelength division multiplexer, a high-nonlinearity fiber, a first polarization controller, a second polarization isolator, an output coupler, a dispersion compensation fiber, a circulator, a semiconductor saturable absorption mirror (SESAM), a second polarization controller and a chirped pulse fiber amplifier (CPA). The system comprises a first collimator, a first diffraction grating, a first cylindrical lens, a multi-phase plane, a plane mirror, a second cylindrical lens, a second diffraction grating, a spherical lens, a cubic beam splitter, a beam analyzer CMOS, a collimation and beam expanding lens group, a receiving antenna, a power meter, a photoelectric detector and a field programmable gate array FPGA. And stable signal transmission is realized.

The application discloses a system and method for measuring laser contrast by using chirped pulses, comprising a collimating beam splitting device, a main laser energy tuner, a plasma generating device, a probe light delay adjusting device, a probe light spectrum widening device and a monitoring device; laser pulses are divided into two beams by the collimating beam splitting device, one of which is a main laser and the other is a probe light; the main laser passes through the main laser energy tuner, enters the plasma generating device to generate plasma, and then returns to a light return monitoring camera; the probe light enters the probe light delay adjusting device, becomes a chirped pulse through the probe light spectrum widening device, then passes through the plasma generating device, carries information in the plasma, and enters the monitoring device.

This invention discloses a laser-induced acoustic underwater communication method and apparatus based on discrete linear frequency modulated pulse intervals, belonging to the field of cross-medium communication technology. The invention first maps the binary data to be transmitted into a pulse time interval pattern, where logic "0" and "1" correspond to pulse sequences with pulse intervals that decrease or increase linearly with time, respectively, and inserts a silence protection interval. A laser is controlled to emit pulses towards the water surface at non-uniform intervals, utilizing the photoacoustic effect to excite a train of acoustic pulses with discrete linear frequency modulated characteristics in the water. After acquiring the acoustic signal, the receiving end uses a local reference signal matching the transmitting end's pattern to perform dual-channel cross-correlation demodulation, achieving data decision-making and self-synchronization based on the amplitude and position of the correlation peaks. This invention combines the cross-medium advantages of laser-induced acoustics with the high processing gain characteristics of linear frequency modulated signals, solving the problem of poor multipath resistance in traditional pulse position modulation and significantly improving communication reliability in complex underwater acoustic channels.

A source control arrangement for a radiation source including a hollow-core photonic crystal fiber (HC-PCF) having a hollow core with a core diameter, the arrangement including a pulse chirping arrangement configured to receive pulsed pump radiation and controllably chirp the pulsed pump radiation so as to output chirped pulsed pump radiation for exciting a working medium within the hollow core of the fiber at a pressure. The arrangement operable to configure one or more source parameters of the radiation source, which include one or both of the pressure and a pulse chirp parameter, such that the chirped pulsed pump radiation undergoes a spectral broadening process within the HC-PCF, thereby generating an output radiation having a predefined spectrum for a reference core diameter of the HC-PCF, so as to compensate for variation in the core diameter with respect to the reference core diameter.

The application discloses a kind of based on GPU acceleration's pulse compression DAS frequency domain matching filter method and system, it is related to optical fiber sensing technical field, including: the initial receiving signal after Rayleigh backscattering signal and local light interference of pulse compression DAS system are carried out band-pass filter processing, obtain the receiving signal after pre-processing;Based on GPU parallel and the transmitting linear chirp pulse signal of pulse compression DAS system are carried out frequency domain matching filter to the receiving signal after pre-processing, obtain compressed time-domain signal;Compressed time-domain signal is carried out vector rotation average processing, obtain the time-domain signal of suppression coherent fading;Phase demodulation is carried out to the time-domain signal of suppression coherent fading, obtain the disturbance information of measured optical fiber.The application has alleviated the technical problems of low signal demodulation efficiency, difficult to meet the real-time monitoring needs of prior art.

The invention relates to improved disambiguation in Doppler division multiple access radars. For systems, methods, and apparatus to improve disambiguation in Doppler division multiple access radars, an example apparatus (700) includes a plurality of transmit antennas (7081 to 708N). The apparatus (700) includes a plurality of transmitters (7041 to 704N) coupled to the plurality of transmit antennas (7081 to 708N) and including respective phase shifters (7161 to 716N) configured to apply respective phase changes between chirp pulses of a frame such that a phase spectrum of the plurality of transmitters (7041 to 704N) is divided into a plurality of frequency bands, the plurality of transmitters (7041 to 704N) being coupled to the plurality of transmit antennas (7081 to 708N), and the respective phase shifters (7161 to 716N) being coupled to the plurality of transmit antennas (7081 to 708N). At least three of the respective phase transitions are distributed discontinuously along partitions of the phase spectrum. Other examples are described.

The invention relates to a terahertz wave single-shot measuring device and method based on cross polarized wave spectrum broadening. The measuring device comprises the steps that light emitted by a femtosecond laser light source is split into reflected light and transmission light after passing through a beam splitting piece; the reflected light is used as pump light for generating terahertz waves, and the generated terahertz waves are collected by a parabolic mirror and focused on an electro-optical crystal; transmission light sequentially passes through a first reflecting mirror, a diaphragm, a half-wave plate, a first linear polarizer, a lens combination and a plurality of third-order nonlinear crystal combinations to generate cross-polarized waves with broadened frequency spectrums; the generated cross polarized wave is broadened by the chirped pulse to serve as new detection light, the new detection light is further focused on the electro-optical crystal through the lens and coincides with the focus of the terahertz wave, the detection light modulated by the electro-optical effect is collected by the spectrograph, a spectrum is detected, and single-shot measurement of the terahertz wave is achieved. Compared with the prior art, the method has the advantages of high time resolution, high signal-to-noise ratio and the like for single-shot measurement of terahertz waveforms.