133 results about "Pulse broadening" patented technology

The invention relates to a residual error pulse broadening interpolation quantization type column-level ADC and a CMOS image sensor, and the residual error pulse broadening interpolation quantization type column-level ADC comprises a comparator, a residual error extraction circuit, a pulse broadening circuit, a coarse quantization counter, a fine quantization counter and an error correction circuit. The comparator is used for comparing a ramp signal and a pixel signal, and the output end of the comparator is connected with the input end of the residual error extraction circuit and the input end of the coarse quantization counter through a first AND gate; the residual error extraction circuit is used for extracting a time difference between an output falling edge of the first AND gate and a first clock rising edge behind the residual error extraction circuit; an output end of the residual error extraction circuit is connected with an input end of the pulse broadening circuit and an input end of the error correction circuit; and the pulse broadening circuit is used for broadening the output of the residual error extraction circuit, and the output end of the pulse broadening circuit is connected with the input end of the fine quantization counter. The problems that an existing SSADC is low in quantization speed and not high in time precision are solved.

The invention discloses an ultrafast electron diffraction system based on 300kV direct current acceleration and radio frequency compression and a diffraction imaging method, and solves the problems that the time resolution of the current keV ultrafast electron diffraction system is insufficient due to the space charge effect, and the time-varying electric field generated by a radio frequency compression cavity is used for carrying out time compression on the beam bunch length of an electronic pulse; and the electronic pulse energy is low. According to the invention, femtosecond laser is split, one beam of light generates an ultrafast electronic pulse by using an ultrafast electron generation module based on 300kV direct current acceleration, the energy of the ultrafast electronic pulse is relatively high, and then the pulse width of the ultrafast electronic pulse is compressed by using a radio frequency compression module; the pulse broadening caused by the space charge effect of the ultrafast electronic pulse is effectively inhibited, the time resolution below hundred femtoseconds can be realized, meanwhile, the charge quantity of a single beam of ultrafast electronic pulse reaches 16fC (105e-), and the method can be used for ultrafast kinetic research of irreversible materials.

The invention provides a terahertz vortex radiation generation device based on transverse phase shaping. The terahertz vortex radiation generation device comprises an injector, a laser electron beam modulation system and a terahertz radiation section which are arranged in sequence, the femtosecond laser system comprises a femtosecond laser device, a first beam splitting piece and a first reflecting mirror which are arranged in sequence and are parallel to the electron beam transmission axis, and the first beam splitting piece divides femtosecond Gaussian laser pulses from the femtosecond laser device into a first path of femtosecond Gaussian laser and a second path of femtosecond Gaussian laser; the first path of femtosecond Gaussian laser and the injector are sequentially arranged along the light path of the first path of femtosecond Gaussian laser, and the first reflector, the pulse broadening and beam splitting system and the laser electron beam modulation system are sequentially arranged along the light path of the second path of femtosecond Gaussian laser. According to the terahertz vortex radiation generating device, the longitudinal frequency of terahertz vortex beat frequency laser can be adjusted through the spiral phase plate, the transverse orbital angular momentum of terahertz vortex beat frequency laser can be changed through the adjustable delayer, the layout is simple, the tunability is high, and the terahertz vortex radiation generating device is flexible.

The application provides a communication device, a base station and a communication system. The communication device comprises a power divider, a coupler group and a multiplexer connected in sequence. The power divider is connected with the coupler group through at least two first lines. The power divider can divide light into at least two light beams. Each light beam is transmitted to the coupler group through a first line. Transmission of any two light beams in the corresponding first line has a phase difference and a time difference. The coupler group couples and interferes the received at least two light beams, and outputs at least two coupled light beams. Each coupled light beam enters the multiplexer through a second line. Transmission of any two coupled light beams in the corresponding second line has a time difference. The multiplexer can orthogonally combine the received coupled light beams. The communication device can perform dispersion compensation on the light to suppress pulse broadening, thereby reducing the bit error rate of optical signal transmission and reducing the power loss of the optical signal.

A mid-infrared laser generating system based on dispersion regulation and control soliton group pulses can obtain high-power, high-efficiency and high-proportion mid-infrared laser output, and has the advantages of being all-fiber, compact in structure and high in mid-infrared rear spectrum power proportion. The pulse fiber laser generates nanosecond pulse laser in a 1.5-micron wave band; the optical fiber pulse stretcher is a single-mode quartz optical fiber, the nanosecond pulse is split into a plurality of ultrafast soliton pulses through a nonlinear effect, and spectral energy conversion from 1.5 microns to 2.4 microns is carried out; the fiber laser amplifier further improves the output power of the broadened pulse laser, expands the spectrum to a 2.7-micron wave band, and improves the pulse energy after the 2.3-micron wave band; the optical fiber mode field adapter efficiently couples the pulse generated in the optical fiber laser amplifier into the nonlinear optical fiber; the nonlinear optical fiber expands the laser to a mid-infrared 3-5 micron wave band, and mid-infrared laser output with high power, high efficiency and high proportion is obtained.

The invention discloses a photon-assisted microwave signal time-frequency amplitude-phase measurement system and method, and the system is characterized in that a pulse light source outputs a light pulse which enters an input end dispersive medium to complete pulse broadening, and then the light pulse enters an electro-optical modulation module; meanwhile, the power divider receives the microwave signal and divides the microwave signal into two paths to be input into an upper sub-modulator and a lower sub-modulator of the electro-optical modulation module so as to modulate optical pulses; a modulated optical signal output by the electro-optical modulation module passes through an output end dispersive medium to complete a time convolution process, then the output optical signal is divided into two paths through the optical coupling module, the two paths sequentially pass through the polarization controller, the polarization beam splitter, the photoelectric detector, the analog-to-digital converter and the digital signal processor, position information and amplitude information of an electric pulse are collected, and the position information and the amplitude information of the electric pulse are obtained. And obtaining time, amplitude, frequency and phase information of the microwave signal. The time, frequency, amplitude and phase information of the microwave signals can be measured at the same time, complex back-end processing is not needed, and the processing speed is high.

The invention relates to the technical field of multi-beam laser radar'low, small and slow 'target detection, in particular to a multi-channel TDC signal processing board card and a multi-beam laser radar signal processing system. According to the multichannel TDC signal processing board card, a pulse broadening circuit, a delay chain signal sampling circuit, a coding circuit, a synchronous coarse counting circuit and a data integration generation circuit are constructed based on an FPGA (Field Programmable Gate Array); the pulse broadening circuit is used for adjusting a starting moment and an ending moment of an input pulse to obtain a pulse broadening signal; the delay chain signal sampling circuit comprises a delay chain and a D trigger array; the pulse broadening signal is interpolated and delayed by a delay chain and then a thermometer code is generated by a D trigger array; the coding circuit is used for coding thermometer codes output by the D trigger array; and the synchronous coarse counter is used for triggering the data integration generation circuit, so that the data integration generation circuit integrates and outputs the coded data output by the coding circuit. According to the invention, the problem of synchronous acquisition and identification of the transmitting signal and the echo signal in the multi-beam laser radar is solved, and the time detection and measurement precision is improved.

The invention discloses an integrated circuit standard unit time sequence arc pulse delay measurement system, which comprises an on-chip clock generation module used for generating a high-frequency clock on a chip as a reference counting clock; according to the on-chip standard unit time sequence arc generation circuit, pulse broadening of time sequence arcs is achieved through a multi-stage cascaded circuit structure of the same time sequence arcs, and single time sequence arc delay is measured through superposition of multi-stage same time sequence arc delay; the on-chip time sequence arc counting circuit is used for counting the broadened time sequence arc pulses by using an on-chip high-frequency clock as a reference clock; the on-chip input and output module is used for controlling the selection of various integrated circuit standard unit types, the selection of time sequence arcs and the output of the counter; and the wafer circuit testing machine is used for performing wafer-level electrical connection by using a wafer circuit testing probe, supplying power to the integrated circuit standard unit and inputting and outputting signals. According to the invention, integrated circuit standard cell time sequence arc measurement and measurement of all time sequence arcs of all standard cells in a standard cell library are realized.

The invention discloses a full-simulation time sequence prediction reserve pool calculation system based on a dispersion effect. The system comprises a light source array module, an input layer module, an all-optical reserve pool layer module and a photoelectric simulation readout layer module, the input layer module is used for receiving an external input signal, converting the external input signal into an electric modulation signal and transmitting the electric modulation signal to the all-optical reserve pool layer module; the all-optical reserve pool layer module loads a modulation signal to an optical signal, forms an optical pulse information sequence through short-term nonlinear memory processing of time sequence information, and transmits the optical pulse information sequence to the photoelectric analog readout layer module; and the photoelectric simulation readout layer module is used for analyzing and reading information in the all-optical storage layer module, obtaining a corresponding weight value through weight training, and executing linear regression operation to obtain an output result. The pulse broadening effect caused by the dispersion device is utilized to realize the storage layer, the linear regression operation of the photoelectric simulation readout layer is realized through the photoelectric simulation readout layer module, and the accuracy and the response speed of time sequence prediction are improved.

This application discloses an assembly and adjustment device for a pulse broadening unit, comprising: a visible light source device, a pulse broadening unit, a phase delay element, a linear polarizer, and a reticle; the pulse broadening unit includes a beam splitter and a mirror assembly; the output beam from the visible light source device is incident on the beam splitter; the beam splitter splits the received output beam into a first reflected beam and a transmitted beam; the first reflected beam, after passing through a reflective lens assembly, is incident on the exit surface of the beam splitter, and after being reflected by the exit surface, it illuminates the reticle together with the transmitted beam; the linear polarizer is disposed in the optical path from which the transmitted beam exits, and the angle between its transmission direction and the polarization direction of the transmitted beam transmitted from the beam splitter satisfies the following condition: eliminating part of the energy of the transmitted beam; the phase delay element is disposed in the optical path before the first reflected beam is incident on the exit surface of the beam splitter, and is used to rotate the polarization direction of the first reflected beam by the same angle.

A laser device includes an oscillator outputting pulse laser light; an amplifier amplifying the pulse laser light; an optical pulse stretcher extending a pulse width of the pulse laser light; a beam divergence angle adjuster including an upstream lens arranged on an optical path of the pulse laser light, a downstream lens arranged downstream of the upstream lens, and an optical path length changing mechanism for changing an inter-lens optical path length between the upstream lens and the downstream lens; and a processor controlling the beam divergence angle adjuster and obtaining a repetition frequency or a duty of the pulse laser light, and to change, when the repetition frequency or the duty changes by a preset threshold or more, the inter-lens optical path length so that the beam divergence angle of the extended pulse laser light becomes small in accordance with the repetition frequency or the duty after the change.

The laser annealing system includes: a laser system; and a laser annealing device, which irradiates a first pulse laser and a second pulse laser to an irradiated object, the laser annealing device includes: an irradiation optical system, which guides the first pulse laser and the second pulse laser to the irradiated object; a moving mechanism, which causes the irradiation positions of the first pulse laser and the second pulse laser to move relative to the irradiation position of the irradiated object; and a control unit, which controls the laser system so that the irradiated object is irradiated with the first pulse laser, and after the irradiation with the first pulse laser, the area of ​​the irradiated object irradiated with the first pulse laser is irradiated with the second pulse laser, the laser system includes: a laser oscillator, which outputs a pulse laser; an optical pulse stretcher, which stretches the pulse laser output from the laser oscillator; and a gate, which is arranged on a delay optical path of the optical pulse stretcher, and the control unit controls the output of the first pulse laser and the second pulse laser by controlling the opening and closing of the gate.

The application discloses a kind of photonic auxiliary microwave signal time-frequency amplitude phase measurement system and method, pulse light source output light pulse in the system enters input end dispersion medium and completes pulse broadening, then enters electro-optic modulation module, simultaneously power divider receives microwave signal and it is divided two-way input electro-optic modulation module in upper and lower sub-modulator to modulate light pulse;The modulated light signal output by the electro-optic modulation module passes through output end dispersion medium, completes time convolution process, after this, output light signal will pass through optical coupling module and be divided into two paths, in turn pass through polarization controller, polarization beam splitter, photodetector, analog-digital converter, digital signal processor, the position information and amplitude information of electric pulse are collected, and the time, amplitude, frequency and phase information of microwave signal are obtained.The application can simultaneously measure the time, frequency, amplitude, phase information of microwave signal, and does not need complex post-processing, and processing speed is fast.

The application discloses a time-to-digital converter based on pulse stretching. The time-to-digital converter structure combines frequency multiplication delay locked loop, pulse stretching circuit and calibration circuit, guarantees high resolution, effectively increases the range of the time-to-digital converter, and can reduce the influence of PVT. The calibration circuit has simple structure, low calibration cost, and is suitable for the calibration of the pulse stretching circuit. In addition, the calibration algorithm for the static phase error of the frequency multiplication delay locked loop only needs to increase a 1bit counter, the additional circuit cost is very small, and the influence of the static phase error of the frequency multiplication delay locked loop can be overcome.

The invention relates to the technical field of microscopic imaging, and particularly provides a stimulated Raman scattering microscopic imaging system capable of simultaneously scanning double Raman frequency shift spectrums, which comprises a laser light source driving and modulating unit and a signal detecting and data processing unit, the laser light source driving and modulating unit comprises a dual-channel laser synchronous excitation module, a light beam polarization regulation and power distribution module, a pulse broadening and spectrum focusing module, a dual-channel dual-phase modulation module, a common-path different-time dual-frequency difference module and a laser scanning and telecentric focusing module; and the signal detection and data processing unit comprises a dual-channel orthogonal demodulation module and a scanning driving and signal synchronous acquisition module. Compared with the prior art, the dual-Raman frequency shift spectrum scanning stimulated Raman microimaging device has the advantages that dual-Raman frequency shift spectrum scanning stimulated Raman microimaging with higher acquisition speed, high resolution and wide spectrum coverage range is realized, and the problem of long time consumption for acquiring the complete spectrum of the to-be-tested sample by the traditional single-frequency resonance spectrum scanning stimulated Raman microimaging is solved.

This laser device is provided with: a laser oscillator which includes an optical resonator and a pair of electrodes for generating discharge by applying a voltage to a laser gas, and which outputs a first pulsed laser light; a first optical pulse stretcher that transmits a portion of the first pulse laser light, surrounds the other portion of the first pulse laser light by one circle, and outputs a first transmitted light and a first one-circle surrounding light, which have a first shift amount and spatially overlap a portion of the first transmitted light and the first one-circle surrounding light, thereby outputting a second pulse laser light in which the pulse time width of the first pulse laser light has been expanded; and a second optical pulse stretcher that transmits a part of the second pulse laser light, surrounds the other part of the second pulse laser light by one circle, and outputs second transmitted light and second one-circle surrounding light that have a second offset amount different from the first offset amount and spatially overlap a part of the second transmitted light and a part of the second one-circle surrounding light. As a result, a third pulse laser beam having an extended pulse time width of the second pulse laser beam is output.

The application discloses a ytterbium-doped fiber mode-locked laser, which comprises a first pump source, a first regenerator, a second pump source and a second regenerator. The first regenerator comprises a first ytterbium-doped fiber and a pulse stretching device, and the second regenerator comprises an isolator, a pulse compression device, a spectrum stretching fiber and a band-pass filter. The design of the staggered band-pass filter is realized through the two regenerators, and the spectrum is widened due to the self-phase modulation effect; in addition, the energy input of the first pump source and the second pump source can realize the mode-locked pulse output. The application reduces the peak power by pulse stretching to reduce the nonlinear effect, realizes the generation of high-energy output pulses in the fiber mode-locked laser, and the interval between the pulse stretching device and the central wavelength of the band-pass filter can effectively prevent the noise and continuous component from oscillating, and improve the pulse quality.

A light source apparatus 200 generates emitted light L1 to be radiated onto a sample. A pulsed light source 210 generates near-infrared wideband pulsed light L0. A pulse stretcher 220 stretches the wideband pulsed light L0 in the time axis direction to generate near-infrared wavelength swept light L1a, which is a pulse train including a plurality of pulses having different central wavelengths. A wavelength converting device 250 converts the wavelength of the near-infrared wavelength swept light L1a emitted from the pulse stretcher 220 to generate the emitted light L1.

The application provides a high-power multicolor terahertz radiation generation device based on beat laser accumulation, which comprises an injector, an electron beam modulation system and a radiation system arranged in sequence; and a femtosecond laser system comprising a femtosecond laser, a first light splitting plate and a first mirror arranged in sequence and parallel to the electron beam transmission axis, the first light splitting plate splits the femtosecond Gaussian laser pulses from the femtosecond laser into first and second path femtosecond Gaussian lasers, the first light splitting plate, a pulse broadening system and the injector are arranged in sequence, and the first mirror, a laser accumulation system and the electron beam modulation system are arranged in sequence; the laser accumulation system generates beat accumulation laser with multiple terahertz cycles after receiving the second path femtosecond Gaussian laser. The device of the application can realize the center frequency of the multicolor terahertz radiation being adjustable, the number of the multicolor being variable, the frequency and time interval being controllable, the layout being simple, the tunability being strong and the flexibility being relatively high.

Apparatus for and method of aligning optical components such as beam splitters in an optical pulse stretcher in which a landing spot of a beam which has traversed a portion of the optical beam splitter and a coincident landing spot of a beam split from a retroreflected input beam are made to align on a target spot. Also disclosed is an apparatus and method for aligning the retroreflector to facilitate proper beam alignment. A fluorescent material may be used to render a beam landing spot visible.

The application relates to an underwater laser pulse time domain expansion measurement system and method, wherein the measurement system comprises a receiving lens for directly aiming at a pulse laser to be measured and receiving a laser beam output by the pulse laser to be measured; a laser processing unit connected with the receiving lens in an optical path to perform collimation, attenuation and light filtering processing on the laser beam; a high-speed photoelectric detector connected with the laser processing unit in an optical path, used for collecting the processed laser beam and converting the laser pulse electrical signal W1; a data acquisition board electrically connected with the high-speed photoelectric detector, used for collecting the laser pulse electrical signal W1 and sending the laser pulse electrical signal W1 to an analysis processing unit; and the analysis processing unit receives the laser pulse electrical signal W1, calculates the pulse width of the laser pulse electrical signal W1, and calculates the time domain expansion of the laser beam according to a pulse expansion calculation method. The application realizes direct measurement of the time domain expansion of an underwater laser pulse, and improves the measurement accuracy.

The invention provides a femtosecond laser pulse compression system with a compact structure and an adjustable pulse width, and relates to the technical field of femtosecond lasers, the system sequentially comprises a seed source, a pulse stretcher, an amplification chain and a pulse compression device along a light path, the pulse compression device comprises a polarization beam splitting unit, an electro-optical polarization modulation unit, a single compression grating and a light path turn-back unit; wherein the polarization beam splitting unit, the electro-optical polarization modulation unit, the single compression grating and the light path turn-back unit jointly form a multi-channel folding compression light path; a voltage signal with a specific time sequence is applied to the electro-optical polarization modulation unit, and the polarization state of a light beam is dynamically switched, so that the light beam is selectively controlled to complete back-and-forth transmission of a preset number of times in a multi-channel folding compression light path in different polarization states, and the compression ratio of laser pulses and the width of output pulses are continuously adjusted. On the premise that large-spread-width matching is guaranteed, the system is extremely compact, and the pulse width is continuously and flexibly adjusted in an electric control mode.

The application provides a method and device for intra-channel and inter-channel nonlinear joint compensation of a WDM system based on an improved LDBP and electronic equipment, and belongs to the technical field of optical fiber communication. The method compensates dispersion by using a linear filter in the time domain, the corresponding network structure is designed as one-dimensional convolution, and the pulse broadening effect is combined in the overlap reservation method, the physical model of nonlinear compensation is improved by considering the interference of intra-channel dispersion pulse broadening and the walk-off effect between channels, and the purpose of intra-channel and inter-channel nonlinear joint compensation is achieved. The application fully utilizes the random interaction between inherent dispersion and nonlinearity in the optical fiber communication system to compensate the phase shift caused by the nonlinear effect, can effectively equalize the nonlinear distortion of the signal under the condition of controlling the calculation complexity and reducing the implementation cost, and is expected to play a better role in the long-distance transmission of the large-capacity WDM system.

The invention belongs to the technical field of semiconductors, and particularly relates to an APD chip with an isolation groove and a preparation method of the APD chip. The APD chip provided by the invention comprises a first insulating layer arranged on the upper surface of a cap layer except a photosensitive region; the isolation groove at least simultaneously penetrates through the first insulating layer, the non-photosensitive area of the cap layer, the charge layer and the absorption layer, and the isolation groove surrounds the periphery of the photosensitive area. The isolation groove is arranged around the periphery of the photosensitive area, and the depth of the isolation groove is controlled, so that when light irradiates the passivation area, the APD chip of the detector does not generate a signal or the signal is very small due to the isolation effect of the isolation groove, and laser radar pulse broadening can be effectively inhibited. Therefore, the cost is reduced, and the problem of pulse broadening of the laser radar is solved.

The invention discloses a multicarrier underwater communication method based on a pulse broadening technology, which comprises the following steps of: converting information to be transmitted into a binary array with 8 bits as one byte through an ASCII (American Standard Code for Information Interchange) coding unit, changing the binary array into a new array with 10 bits as one byte and with similar occurrence times of 0 and 1 after the binary array passes through an 8 / 10B coding unit, and modulating the new array through multicarrier OOK (On-Off Keying) of a modulation unit, a broadening coefficient k is solved by a Gaussian envelope approximation and parameter solving unit, a modulated signal is broadened according to the broadening coefficient k in a broadening unit, the signal is transmitted in water and received by a receiving end, and transmitted information is restored after demodulation by a demodulation unit, 10B / 8B coding and ASCII decoding. And the obtained signal has a relatively low peak-to-average ratio, so that underwater long-distance transmission is facilitated.

A pulse stretcher includes a beam splitter splitting pulse laser light into two beams of pulse laser light, first concave mirrors arranged side by side in a predetermined direction, and second concave mirrors arranged side by side in the predetermined direction as having the same number as the first concave mirrors and facing the first concave mirrors, respectively. One beam of pulse laser light split by the beam splitter travels to one first concave mirror among the first concave mirrors and is reflected alternately by the first concave mirrors and the second concave mirrors 12 times or more as even number times to return to the beam splitter. A number of overlapping of the one beam at each of concentration points where at least part of the one beam of pulse laser light overlaps at beam waists of the one beam is two.

An optical pulse stretcher for stretching the pulse width of pulsed laser light, the optical pulse stretcher comprising: a polarizer that separates a component of incident pulsed laser light that has a specific polarization direction; delay optics including a plurality of mirrors for propagating the pulsed laser light that has been reflected by or transmitted through the polarizer; and a first Faraday rotator that includes a first magnet and a first Faraday material, is disposed on the optical path of the delay optics, and rotates the polarization direction of the pulsed laser light.

The invention belongs to the technical field of ship systems, and discloses a space microwave radiation power automatic monitoring alarm device which comprises an omnidirectional antenna, a coaxial attenuator, a filter, a radio frequency detection comparison control unit and an alarm lamp. Wherein the radio frequency detection comparison control unit comprises a detection comparator, a pulse broadening chip and a relay. On the basis that the original radiation source design is not changed, the defects and deficiencies of an existing monitoring system can be overcome, the sound-light alarm device is additionally arranged, when it is detected that high-power microwave radiation exists in the surrounding environment, an alarm is automatically given, and testers are reminded to pay attention to evacuation; and meanwhile, whether the signal is radiated or not is detected in the space, so that the tested equipment personnel have more energy to pay attention to the state of the equipment, and a powerful guarantee is provided for smooth development of the test of the tested equipment.

This invention discloses a device for real-time analysis of multidimensional information of spatiotemporally mode-locked pulses using an all-fiber structure, belonging to the field of ultrafast optics technology. It includes an all-fiber spatiotemporally mode-locked laser platform, a raw pulse beam profile measurement module, an optical circulator, a sub-pulse beam profile measurement module, and a dispersive Fourier transform and real-time spectral information detection module. Based on the generalized multimode nonlinear Schrödinger equation, this invention constructs a theoretical model of the spatiotemporally mode-locked laser, explores the multidimensional parameter coupling mechanism during spatiotemporal mode-locking, clarifies the mapping relationship between modes and frequencies, and provides a theoretical basis and method for high-precision mode differentiation and multidimensional real-time information extraction. This invention aims to rationally design the parameters of each fiber grating according to the spectral width and temporal interval of the spatiotemporally mode-locked pulse, reflecting more sub-pulses while ensuring that the pulse temporal domains do not overlap, achieving high-precision spatial mode resolution, and maximizing pulse broadening to obtain high-resolution real-time spectral information.

The present invention belongs to the field of laser ranging, and specifically relates to an absolute distance measurement method and device based on optical frequency comb chirped pulse interferometry. The method comprises: using an optical frequency comb to generate and split pulsed lasers; using one of the beams as signal light to generate reference light and measurement light, with a time delay between the two corresponding to the absolute distance to be measured; widening the other beam as local oscillator light, which interferes with the reference light and measurement light, respectively, to generate two interference pulses; widening the two interference pulses, and using a high-speed photodetector and a high-speed oscilloscope to collect information about the widened two interference pulses in real time; wherein the pulse width of the local oscillator light satisfies that the reference light and measurement light can interfere with the local oscillator light at any position; and subtracting the spectral phases of the two sets of chirped pulse interference fringe information to calculate the absolute distance to be measured. The present invention can achieve rapid absolute distance measurement along the entire path without blind spots.