124 results about "Frequency shifter" patented technology

The invention provides a frequency-modulated continuous wave laser ranging device based on frequency shift double optical combs, which integrates frequency-modulated continuous wave and double optical comb technologies and comprises an FMCW light source, a beam splitter, a detection and reference light channel, a beam combiner, a photoelectric detector and a processing module. The FMCW light source outputs linear frequency sweeping laser which is divided into two paths through the beam splitter, and the detection light channel detects a target through the first optical comb generator and the circulator. The frequency fFS of the reference optical channel is increased through a frequency shifter, optical combs with different comb tooth intervals are generated by a second optical comb generator, and the fFS and the repetition frequency difference delta fR are in a non-integer multiple relation, so that interference is effectively avoided. After being combined by the beam combiner, the two paths of signals are converted into beat frequency signals by the photoelectric detector, and then time domain signals are spliced by the processing module by using coherence, so that the distance measurement precision is improved. According to the invention, the frequency shift double-optical comb technology improves the precision and anti-interference performance; an efficient data processing algorithm ensures rapid measurement and a wide range of application.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

The invention discloses an optical fiber sensing phase demodulation method and system, and belongs to the technical field of optical sensing. According to the invention, line width lt is adopted; a 1MHz laser is used as a light source, a low-frequency or high-frequency current modulation signal introduced at the light source is eliminated by introducing a reference interferometer and combining a cross subtraction algorithm and arc tangent operation, the requirement for the line width of the light source is reduced, and the cost and complexity of the system are remarkably reduced; a large-amplitude phase excitation signal is introduced through a low-frequency or high-frequency current modulation signal, ellipse closing is forced, the limitation that the signal amplitude is larger than or equal to pi / 2 in a traditional ellipse fitting method is avoided, the problem of parameter mismatch is solved, meanwhile, introduction of a modulator or a frequency shifter is avoided, and the size and power consumption of the system are further reduced. A reference interferometer with a symmetrical structure is introduced, a light source modulation signal and frequency jitter noise are eliminated in combination with a cross subtraction algorithm, and the demodulation precision and stability are improved.

The invention belongs to the technical field of optical communication, and particularly relates to a high-stability photo-generated millimeter wave system based on a phase-locked loop, which comprises a first laser, a second laser, an acousto-optic frequency shifter, a dense wavelength division multiplexer, an inner loop feedback control loop and an outer loop signal output branch, the inner loop feedback control loop comprises a phase modulator, an optical filter, a photoelectric detector, a frequency division arithmetic unit, a phase frequency detector, a loop filter, a voltage-controlled oscillator and a first power amplifier which are sequentially connected in series, and the output of the first power amplifier is connected with an acousto-optic frequency shifter; the inner loop feedback control loop further comprises a cesium atomic clock, a microwave source and a second power amplifier; wherein the cesium atomic clock is connected with the microwave source and the phase frequency detector, and the output of the microwave source is connected with the phase modulator after passing through the second power amplifier.

The invention relates to the technical field of semiconductor lasers, and particularly provides a tunable narrow-linewidth multi-wavelength laser based on injection locking, which comprises a light source, an optical splitter, a coupler, a photoacoustic frequency shifter and a micro-ring, the optical path of each sub-beam is provided with a photoacoustic frequency shifter and a micro-ring, the photoacoustic frequency shifters are responsible for adjusting the frequency of the sub-beams, the micro-rings and a light source form an injection locking relation and compress the line width of the sub-beams, then all the sub-beams are combined through a coupler, and finally power amplification is conducted through a semiconductor optical amplifier. Through the optical splitter, the photoacoustic frequency shifter and the micro-ring, the single light source system outputs equally-spaced multi-wavelength laser, and the defects of a traditional multi-light-source design are overcome.

An OCT instrument comprising: an optical coupler which generates signal light and reference light from a swept narrowband light source; a detector which samples a time-varying interference signal based on the reference light and signal light returned from a sample; an adjustable optical frequency shifter which: generates a first sideband light by adjusting an optical frequency of the reference light, such that the detector unit samples a first time-varying interference signal resulting from an interference between the sideband light and the returned signal light; and maintains the optical frequency of the reference light such that the detector unit samples a second time-varying interference signal resulting from an interference between the reference light and the returned signal light. The OCT instrument generates a respective axial depth profile of the sample based on each of the sampled first time-varying interference signal and the sampled second time-varying interference signal.

The invention discloses a frequency stabilized laser based on a double-fiber interferometer. The frequency stabilized laser comprises a narrow linewidth laser, an acousto-optic frequency shifter, a 1 * 2 fiber splitter I, the double-fiber interferometer, a voltage-controlled oscillator and a control module, the output end of the narrow linewidth laser is connected with the input end of the acousto-optic frequency shifter, and the two input ends are connected with the second output end and the third output end of the control module respectively. The driving input end of the acousto-optic frequency shifter is connected with the output end of the voltage-controlled oscillator, and the output end of the acousto-optic frequency shifter is connected with the input end of the 1 * 2 optical fiber splitter I; one output end of the 1 * 2 optical fiber splitter I outputs a frequency-stabilized laser signal, and the other output end of the 1 * 2 optical fiber splitter I is connected with the input end of the double-optical-fiber interferometer; the output end of the double-fiber interferometer is connected with the input end of the control module; the first output end of the control module is connected with the voltage-controlled oscillator, and the second and third output ends are connected with the narrow linewidth laser. According to the invention, laser signal output with high precision and high frequency stability is realized, and the frequency stability of the laser is three to four orders of magnitude higher than that of a narrow linewidth laser.

The invention discloses a test method and device for measuring nonlinearity of a phase modulator, and belongs to the technical field of measurement, the device comprises a laser source, a polarization controller, a beam splitter, the phase modulator, a coupler, a photoelectric detector, a microwave source I, an acousto-optic frequency shifter, a microwave amplitude phase detection module and a microwave source II; the laser source is used for outputting a fixed-frequency optical signal to the polarization controller; the polarization controller is used for compensating the polarization state of the optical signal; the beam splitter is used for equally dividing an optical signal into two paths, the first path of optical signal is transmitted to the phase modulator, and the second path of optical signal is transmitted to the acousto-optic frequency shifter; by means of the mode, the problem that the phase modulator directly enters the photoelectric detector, photoelectric conversion cannot be conducted, and nonlinear parameters cannot be detected is solved.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

The invention discloses a heterodyne laser interferometer signal processing link dynamic performance calibration device based on an acousto-optic frequency shifter and a calibration method of the heterodyne laser interferometer signal processing link dynamic performance calibration device, and relates to the technical field of heterodyne laser interferometer dynamic measurement performance calibration. The calibration result is coupled with the abbe error and cosine error caused by mechanical installation and the like and the data cycle error caused by asynchronous measurement, so that the problem that the dynamic measurement performance of the interferometer in the signal processing link is difficult to evaluate is solved. The calibration device comprises a laser assembly, a first measurement light path, a second measurement light path, an AOFS drive and motor controller light path and a phase meter. The laser assembly emits laser into the beam splitter prism assembly, the beam splitter prism assembly divides incident light into two beams of laser, the two beams of laser enter the first measuring light path and the second measuring light path respectively, and finally the two beams of laser are sent to the phase meter to calculate the phase difference. The device is an equivalent calibration device suitable for dynamic measurement performance of a heterodyne laser interferometer under high-speed movement of a target in a signal processing link.

The application discloses a device and method for coexistence of bright-dark solitons based on a mode division multiplexing resonant cavity, and relates to the technical field of lasers.The device for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity comprises an erbium-doped fiber amplifier, a first optical coupler, an acousto-optic frequency shifter, a second optical coupler, a third optical coupler, a first mode selection coupler, a second mode selection coupler and a fiber ring resonant cavity, and the fiber ring resonant cavity is a non-uniform dispersion few-mode fiber.The device and method for coexistence of bright-dark solitons based on the mode division multiplexing resonant cavity can realize stable coexistence of bright-dark solitons.

The present invention relates to the field of optical detection, and in particular to a spectral confocal displacement measurement system based on heterodyne interference and a measurement method thereof, wherein a tunable laser emits monochromatic light of different wavelengths, which is divided into two beams of illumination light by a first beam splitter, one beam of illumination light is incident on a beam combiner after being modulated by a first acousto-optic frequency shifter, and the other beam of illumination light is incident on a beam combiner after being modulated by a second acousto-optic frequency shifter, and the two beams of illumination light after being modulated are combined by the beam combiner and incident on a sample through transmission of a second beam splitter and focusing of an objective lens to generate heterodyne interference, forming two light spots with overlapping areas on the sample; the sample reflects the incident light beam, and the reflected light beam is then sequentially transmitted by an objective lens, reflected by a second beam splitter, focused by a third focusing lens, and suppressed by stray light of a third pinhole, and received by a photodetector, and converted into an electrical signal and transmitted to a processor. The present invention can realize the combination of heterodyne interference technology and spectral confocal microscopy technology, and improve the measurement resolution.

This light source device comprises: a first mode-locked laser light source that emits first output light; a second mode-locked laser light source that emits second output light; a first frequency shifter that sets the repetition frequency of the first output light to a first drive frequency; and a second frequency shifter that sets the repetition frequency of the second output light to a second drive frequency. The first drive frequency is different from the second drive frequency. The first drive frequency is different from the value of the repetition frequency of the first output light when the first frequency shifter is not operating.

The invention discloses a method for adjusting the current tuning sensitivity of a DFB semiconductor laser, and the method comprises the steps: obtaining a beat frequency signal with a high signal-to-noise ratio through a photoelectric detector in a signal obtaining module, and averagely distributing the power of the beat frequency signal to a digital frequency pre-control module and a feedforward control module through a power divider; the beat frequency signal is filtered, amplified, divided and shaped, the frequency value of the shaped signal is measured in real time by the digital frequency measurement unit, and the digital frequency stabilization control module compares the frequency value with a target set frequency. According to the method, the frequency measurement precision is improved through the multi-period synchronous frequency measurement technology, accurate feedback control over the frequency is achieved through a PID control algorithm, rapid control over the laser frequency is achieved in combination with feed-forward control over the acousto-optic frequency shifter, the current tuning sensitivity of the DFB semiconductor laser is effectively improved, and the frequency tuning precision of the DFB semiconductor laser is improved. The problems that in the prior art, the adjusting direction is not clear, errors are large, and the anti-interference capacity is weak are solved.

The application discloses a microwave photon frequency hopping signal generation device and method based on an optical switch and belongs to the technical field of optical communication. The application is composed of a light source, a beam splitter, an optical frequency comb generator, an electro-optical frequency shifter, an acousto-optic modulator, a digital frequency synthesizer, a filter array, a signal control unit, an electrically controlled high-speed optical switch, a beam combiner and a photoelectric detector. The application separates optical frequency comb teeth by using an ultra-narrow bandwidth optical filter, selects and opens the frequency hopping signal generated by the local light beat frequency through the optical switch, and can generate a high-speed high-order high-stability frequency hopping signal compared with the prior art.

The invention discloses a photoacoustic stimulated Raman gas detection system and method based on hollow-core optical fiber self-seed injection enhancement, and belongs to the technical field of laser spectrum trace gas detection, the system comprises a light source and beam splitting module, a hollow-core optical fiber seed generation module, a light delay module and a short optical path power amplification module; the main laser beam is split into a first light beam and strong pump light after entering the beam splitter; in the hollow-core optical fiber seed generation module, a first light beam passes through a fifth reflecting mirror, a hollow-core optical fiber seed generation unit, a sixth reflecting mirror and an optical filter, and weak seed light is output; the strong pump light is synchronized with the weak seed light output from the optical filter after entering the optical delay module; in the short-optical-path power amplification module, weak seed light and strong pump light output by the light delay module are combined at a dichroscope and are strictly coaxial, and then are focused by a convex lens and enter a short-optical-path Raman frequency shifter. According to the invention, the oscillation starting threshold of the Raman frequency shifter is greatly reduced by utilizing seed light-induced stimulated radiation.

The present invention relates to the field of semiconductor laser technology, specifically providing a tunable narrow-linewidth multi-wavelength laser based on injection locking. The laser comprises a light source, a beam splitter, a coupler, a photoacoustic frequency shifter, and a microring. The optical signal output by the light source is split into multiple sub-beams by the beam splitter. A photoacoustic frequency shifter and a microring are provided in the optical path of each sub-beam. The photoacoustic frequency shifter adjusts the frequency of the sub-beam, while the microring forms an injection-locked relationship with the light source, compressing the linewidth of the sub-beams. The sub-beams are then combined by a coupler, and finally a semiconductor optical amplifier is used for power amplification. By using the beam splitter, photoacoustic frequency shifter, and microring, the present invention enables a single light source system to output equally spaced multi-wavelength lasers, overcoming the drawbacks of traditional multi-light source designs.

The invention discloses a vernier effect-based phase modulation continuous wave distance measurement method and system. The vernier effect is utilized to enhance the distance measurement capability of phase modulation continuous waves. The method comprises the following steps: selecting two pseudo-random sequences of which the lengths are prime numbers for phase modulation; splicing the two sequences into a modulation sequence, and modulating the laser signal; transmitting a modulation signal to a measured target and receiving an echo; and processing echo signals, respectively measuring time delay by using two sequences, calculating normalized time delay in combination with a code length, solving actual time delay by using the Chinese remainder theorem, and further determining a target distance. The system comprises a laser, a beam splitter, a phase modulator, a signal generator, an acousto-optic frequency shifter, a transmitting / receiving device, a beam combiner, a photoelectric detector and a signal processing module, and realizes high-precision distance measurement. The vernier effect is utilized, the unambiguous measurement distance is effectively increased, the measurement speed is improved, and meanwhile the system complexity is reduced. By combining a precise signal processing algorithm, the actual distance between the measured target and the measuring device can be accurately and quickly calculated, and the method is suitable for high-precision and long-distance distance measurement requirements and has wide application prospects.

This invention discloses a high-resolution ultrafast visible light dual-comb microscopy imaging device and method. The imaging device includes a dual-comb light source, a frequency shifter, a wavelength division multiplexer, a two-dimensional dispersive element, a microscopy imaging system, a dual-comb detector, and a data acquisition and processing section. A dual-comb is used as the light source. The two-dimensional dispersive element expands the optical frequency comb into a wavelength-space-coded lattice light field for illumination. A dual-comb detector performs dual-comb spectral measurements to obtain information contained in the wavelengths. The frequency shifter changes the optical frequency to achieve structured light illumination, thus realizing high-resolution ultrafast microscopy imaging. This invention overcomes the limitations of time-domain stretching in traditional ultrafast measurement techniques on visible light ultrafast microscopy imaging, effectively reducing the spot size of the illumination beam and improving the spatial resolution of the imaging. Utilizing an optical frequency comb to achieve label-free ultra-resolution microscopy imaging with lattice structured light illumination can further improve the resolution of ultrafast microscopy imaging.

The application provides a frequency-shifted double optical comb-based frequency-modulated continuous wave laser ranging device, which combines frequency-modulated continuous wave and double optical comb technology and comprises an FMCW light source, a beam splitter, a detection and reference light channel, a beam combiner, a photoelectric detector and a processing module. The FMCW light source outputs linear sweep laser, which is divided into two paths by the beam splitter, the detection light channel uses a first optical comb generator and a circulator to detect a target, and the reference light channel increases the frequency f FS by a frequency shifter and generates an optical comb with different comb tooth intervals by a second optical comb generator, wherein f FS and the repetition frequency difference Δf R are not integer multiples, thereby effectively avoiding interference. After the two paths of signals are combined by the beam combiner, the photoelectric detector converts the signals into beat signals, and the processing module splices the time domain signals by using the phase correlation, thereby improving the ranging accuracy. The frequency-shifted double optical comb technology improves the accuracy and anti-interference performance, and the efficient data processing algorithm ensures fast measurement and wide application range.

The application discloses a laser phase noise measuring device and method, comprising: a light source to be measured, a first optical coupler, a second optical coupler, an acousto-optic frequency shifter, a first single-mode optical fiber, a third optical coupler, a first polarization controller, a second single-mode optical fiber, a second polarization controller, a fourth optical coupler, a fifth optical coupler, a first balanced photodetector, a second balanced photodetector and a signal acquisition and processing unit. The technical scheme of the application overcomes the mutual restriction problem between sensitivity and bandwidth in the traditional delay interference method, and improves the sensitivity and bandwidth comprehensive performance of the laser phase noise measurement.

The invention relates to the technical field of quantum precision measurement, and discloses an optical clock device based on a bidirectional thermal atom beam, which comprises a first stabilizing module, a second stabilizing module and a feedback control module, the first stabilizing module is used for outputting clock transition detection laser; the second stabilizing module is used for detecting to obtain an optical Laammer spectrum, and is also used for outputting an optical signal with stable frequency; and the feedback control module is used for extracting an error signal from the optical Lammer spectrum and feeding back the error signal to the frequency shifter, so that the clock transition detection laser is locked to the atomic transition spectral line through frequency shifting of the frequency shifter. The cost is low, the structural complexity is low, and the stability of output signals is high.

The invention belongs to the technical field of photoelectricity, and discloses a stepping frequency shift type pulse light generating device and method. Comprising a continuous wave laser (1), a first light beam combiner (2), a first light beam splitter (3), a second light beam splitter (4), a master frequency shifter (5), a first microwave signal source (6), a third light beam splitter (7), a slave frequency shifter (8), a second microwave signal source (9), a second light beam combiner (10), a third light beam combiner (11), a light amplifier (12), a light filter (13) and a light output port (14). The optical frequency comb has the capability of generating an optical frequency comb signal with a stepping change characteristic, the time domain and frequency domain characteristics of the signal have particularity, and the optical frequency comb can be used in the application fields of secret communication, laser target indication, test measurement and the like which need special signals as working media; the device has the capability of realizing on-chip integration, and the tuning precision and the working stability of the device are improved after the on-chip integration is completed.

The invention provides a spectrum testing method for electro-optical modulation signals. The device is composed of a laser, a microwave signal source, a to-be-measured electro-optical modulation signal generation module, an optical frequency shifter, an electro-optical phase modulator, a photoelectric detector and a spectrum analysis module, optical signals output by the laser are divided into two paths, the upper path is in optical connection with the to-be-measured electro-optical modulation signal generation module, and the lower path is in optical connection with the to-be-measured electro-optical modulation signal generation module. The lower path is sequentially and optically connected with the optical frequency shifter and the electro-optic phase modulator and is optically connected with the photoelectric detector after being combined, the microwave signal source is electrically connected with the radio frequency end of the electro-optic phase modulator, and the output end of the photoelectric detector is electrically connected with the spectrum analysis module. Heterodyne mixing signals f1-pf2 (p is a positive integer) of an electro-optical modulation spectrum signal f1 to be detected and an electro-optical phase modulation signal f2 are detected, mixing signal power ratios when output signal voltages of a microwave signal source are V2 and kV2 respectively are analyzed, the p value and the frequency f1 are determined by utilizing the Bessel function relation, meanwhile, the frequency response of a photoelectric detector is calibrated, and the frequency response of the photoelectric detector is calibrated. The relative amplitude of each order of light modulation sideband of the electro-optical modulation spectrum to be tested is obtained, and spectrum testing of the electro-optical modulation signal to be tested is achieved.

An acousto-optic modulator that includes a waveguide on an acoustic actuator is disclosed. The waveguide carries an optical signal having a UV or visible wavelength. When the acoustic actuator is activated, the optical signal in the waveguide is bathed in intense acoustic waves. By using a waveguide having the appropriate dimensions to strongly confine both the optical signal and the acoustic waves, strong optomechanical coupling may be achieved between the optical and acoustic modes, resulting in an efficient modulator. By employing either intra-modal or inter-modal conversion, the modulator may be used to implement a variety of dual- or single-sideband functions, including an isolator, a phase modulator, a single-sideband frequency shifter, or a high-extinction shutter.

The application relates to a dynamic performance calibration device and method of a heterodyne laser interferometer signal processing link based on an acousto-optic frequency shifter, and belongs to the technical field of dynamic measurement performance calibration of a heterodyne laser interferometer. The calibration method of the existing heterodyne laser interferometer couples Abbe error, cosine error and data period error caused by non-synchronous measurement due to mechanical installation, and brings the problem that the dynamic measurement performance of the signal processing link of the interferometer is difficult to evaluate. The calibration device comprises a laser assembly, a first measurement light path, a second measurement light path, an AOFS drive and motor controller light path and a phase meter; the laser assembly emits laser into a beam splitter prism assembly, the beam splitter prism assembly divides the incident light into two beams of laser which are respectively injected into the first measurement light path and the second measurement light path, and finally sent to the phase meter to calculate the phase difference. The application is suitable for the equivalent calibration device of the dynamic measurement performance of the signal processing link of the heterodyne laser interferometer under target high-speed motion.

The invention discloses an all-solid-state pulse laser based on a semiconductor amplifier, and relates to the technical field of wind finding radars, and the laser comprises a laser seed source, an isolator, a semiconductor amplifier, a pulse driving power supply, a balance detector, a frequency shifter, and a circulator. The laser seed source emits a stable narrow-linewidth laser signal to the isolator, the isolator emits laser, the laser is processed by the semiconductor amplifier and the frequency shifter, the processed laser is finally output to the subsequent light receiving and transmitting system through the circulator and finally emitted to the atmosphere, and the light receiving and transmitting system outputs a returned echo signal to the circulator. The circulator outputs an echo signal to the balance detector, the balance detector performs differential detection on the reference light and the echo signal, finally converts a light signal into an electric signal, and transmits the electric signal to the data processing unit for analysis and wind speed measurement; the pulse driving power supply drives the semiconductor amplifier in a short-time overload mode to form high-energy optical pulses, and meanwhile the chopping function is achieved to replace an AOM.

The invention discloses a phase characteristic measuring device of a photoelectric balance detection system, which can be applied to the field of signal processing and comprises a narrow linewidth laser for outputting an optical signal and outputting an upper optical signal and a lower optical signal from the optical signal through a beam splitter, a phase modulator for receiving the optical signal of the upper branch and generating a double-sideband modulation signal, the acousto-optic frequency shifter is used for receiving optical signals of a lower branch, carrying out optical carrier frequency shift and generating optical carrier frequency shift signals, the beam combiner is used for carrying out interference on the double-sideband modulation signals and the optical carrier frequency shift signals and inputting the signals to the photoelectric balance detection system, and the processor is used for obtaining sampling interference waveform data of the photoelectric balance detection system. And performing spectral analysis to obtain phase information at a preset frequency point. In this way, the modulated optical signal completely passes through the signal receiving chain of the photoelectric balance detection system, measurement errors caused by cascade matching of all assemblies are avoided, disassembly testing of each assembly is not needed, and therefore the complexity of phase characteristic measurement of the whole system is reduced.

The application relates to the technical field of electro-optical frequency comb generation, and discloses a super-narrow-line-width, wide-band, flexible-repetition-frequency and adjustable electro-optical comb generation system and method, which comprises a pump laser generation branch, a fiber ring cavity, and a frequency shift injection locking branch.The pump laser generation branch comprises a distributed feedback laser, a first polarization controller and a first circulator; the fiber ring cavity comprises a second circulator, a Brillouin gain fiber, a fiber delay line, a fiber coupler, a second polarization controller, an electro-optical modulator, a dispersion compensation fiber, an optical amplifier, a flat filter and an isolator; and the frequency shift injection locking branch comprises a narrow-bandwidth filter, a polarization controller and a frequency shifter.The electro-optical frequency comb generation device of the application has a novel structure, realizes super-narrow-line-width, wide-band, flexible-repetition-frequency and adjustable electro-optical comb output, solves the limitations of narrow bandwidth and wide comb line width of a traditional electro-optical frequency comb generated based on electro-optical modulation, and does not need complex active optoelectronic feedback to maintain stable operation of the system.

The invention relates to a pure Rayleigh scattering signal acquisition method and system based on a laser source. The method comprises the following steps: performing beam splitting treatment on femtosecond pulses output by a laser source to obtain at least two beams of femtosecond pulses; inputting the first beam of femtosecond pulse into a nonlinear crystal for frequency mixing processing to obtain a preprocessed scattering signal; performing frequency shift processing on the second beam of femtosecond pulse by using an acousto-optic frequency shifter or performing phase lock processing on the second beam of femtosecond pulse by using an optical phase lock ring to obtain a coherent local oscillator signal; inputting the preprocessed scattering signal and the coherent local oscillator signal into a frequency mixer for interference processing to obtain a mixed difference frequency signal; and performing multi-stage signal processing on the mixed difference frequency signal by using a signal processor to obtain a target Rayleigh scattering signal. According to the invention, the Rayleigh scattering signal acquisition accuracy can be improved.