210 results about "Optical pumping" patented technology

The invention provides a global magnetic disturbance compensation method in aviation magnetic survey. The method comprises the following steps: S1, performing high-altitude calibration flight through a motion platform, and acquiring total magnetic field data based on detection data of an optical pump magnetometer; s2, obtaining geomagnetic background gradient information and obtaining geomagnetic field data based on the geomagnetic background gradient information; s3, obtaining motion platform magnetic interference data according to the total magnetic field data and the geomagnetic field data; s4, motion platform attitude information, motion platform current information and fluxgate magnetometer detection data are acquired; s5, obtaining a motion platform magnetic interference coefficient according to the motion platform magnetic interference data, the motion platform attitude information, the motion platform current information and the fluxgate magnetometer detection data; and S6, according to the geomagnetic background gradient information and the motion platform magnetic interference coefficient, performing data compensation on the total magnetic field data in real time during actual aviation magnetic measurement.

The invention provides a self-excited cesium optical pump atomic magnetometer and a magnetic field measurement method. The magnetometer comprises a physical probe part and a circuit part. The physical probe part comprises a cesium spectrum lamp, an optical element, a cesium atom absorption gas chamber, a radio frequency coil and a photoelectric detector; the circuit part comprises a photoelectric conversion circuit, a phase-locked amplification circuit and a radio frequency excitation circuit modulated by square waves. A macroscopic magnetic moment is generated by pumping cesium atoms through left-handed circularly polarized light, a radio frequency magnetic field induces Larmor precession, light intensity changes are detected and fed back to a radio frequency coil to form self-oscillation, and the external magnetic field intensity is calculated according to the linear relation between oscillation frequency and the magnetic field. Square wave modulation is adopted to broaden the measurement bandwidth, a magnetic field direction adjusting system is additionally arranged to automatically keep an angle of 45 degrees between an optical axis and a magnetic field so as to eliminate a blind area, the hemisphere automatic switching function is achieved, and the advantages of being high in sensitivity, fast in response, high in adaptability, small in size and low in power consumption are achieved.

The invention relates to a power-on loading or interchange self-adaption method for a cesium optical pump magnetometer, belongs to the technical field of quantum sensing and geomagnetic detection, and solves the technical problem that the excitation process is tedious during power-on loading or interchange of the cesium optical pump magnetometer in the prior art. Based on the current standard radio frequency power voltage and the standard radio frequency frequency voltage, hopping radio frequency power voltage is applied to the cesium lamp, and the cesium lamp is lightened through the hopping radio frequency frequency voltage; increasing the radio frequency power voltage to a first interval range to heat the cesium lamp, and applying a standard radio frequency frequency voltage until the cesium lamp is preheated; when the collected working voltage of the cesium lamp starts to be reduced, reducing the radio frequency power voltage to standard radio frequency power; and the radio frequency power voltage and the radio frequency frequency voltage are finely adjusted, so that the magnetometer outputs a Larmor signal with a stable waveform, and the radio frequency frequency voltage, the radio frequency power voltage and the cesium lamp working voltage at the moment are stored as optimal working points of the magnetometer. And a self-adaptive power-on loading or interchanging method of the cesium optical pump magnetometer is realized.

A multimodal fusion detection apparatus and method based on optical pumping and photoacoustic imaging are provided, relating to the field of fusion detection technology. In the apparatus, the atomic vapor cell detection path and the first laser irradiation path are both directed toward a target region and at least partially overlap. In this way, the detection paths of optical pumping and photoacoustic imaging are at least partially coincident, ensuring that electrophysiological signals and blood oxygen signals originate from the same tissue region and avoiding the spacing constraints of conventional sensors. Thus, the detection path of the atomic vapor cell can be used for both magnetic field detection and photoacoustic detection, enabling simultaneous acquisition of magnetic and photoacoustic signals at a single detection point, achieving hardware reuse for multimodal fusion detection at the same location and time, reducing device size, and minimizing crosstalk among multimodal sensors.

The embodiment of the invention provides an aviation gravity and magnetic vector dynamic measurement method based on multi-source data synchronous fusion, and relates to the technical field of data acquisition, after sensor array data on a driving flight platform is acquired, a specific force measurement value, a carrier pitch angle, a carrier roll angle and a carrier motion parameter are calculated and output; calculating three output gravity disturbance components by adopting carrier motion parameters and specific force measurement values; fusing total field data of the optical pumping magnetometer to carry out magnetic vector calculation on three-component data of the fluxgate and outputting geomagnetic total elements; and taking a carrier pitch angle, a carrier roll angle, a carrier position, a carrier speed and a carrier course angle as carrier pose data, combining the geomagnetic total elements and the carrier pose data, and outputting a dynamic measurement result of the gravity-magnetic vector field. The problems that in the prior art, gravity measurement and magnetic measurement are separated, equipment redundancy is low in efficiency, collection time is asynchronous, and data precision is reduced are solved. The effect of high-precision, high-dynamic and high-efficiency synchronous acquisition of the gravity and magnetic vector data under the single platform is achieved.

A pump light generation unit of an optical amplifier pumping device outputs pump light with a single wavelength or a plurality of wavelengths from a plurality of output ports. A pump light multiplexing unit polarization-multiplexes or wavelength-multiplexes the plurality of pieces of pump light which has been output from the pump light generation unit. A polarization scrambler collectively polarization-scrambles the polarization-multiplexed or wavelength-multiplexed pump light which has been output from the pump light multiplexing unit and outputs the polarization-scrambled pump light to an optical waveguide for pump light. The optical waveguide for pump light inputs the pump light which has been polarization-multiplexed or wavelength-multiplexed by the pump light multiplexing unit to the pump light superimposition unit. A pump light superimposition unit multiplexes the polarization-multiplexed or wavelength-multiplexed pump light and signal light. A pump light output port superimposes the pump light on the signal light by outputting the pump light from the pump light superimposition unit to the gain medium so that the pump light propagates in the same direction as the signal light.

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

The invention discloses an erbium-doped aluminum oxide and silicon nitride heterogeneous integrated on-chip optical amplifier and an integration method thereof. The amplifier is composed of a straight waveguide, an interlayer coupling waveguide and a bent waveguide. The erbium-doped aluminum oxide-silicon nitride heterogeneous integrated waveguide is formed by adopting the processes of low-pressure chemical vapor deposition, plasma enhanced chemical vapor deposition, oxidation and etching, radio frequency reaction magnetron sputtering, chemical mechanical polishing and the like. According to the structure, signal light pump light is transmitted in the silicon nitride waveguide with the small mode field area in the bent waveguide, so that the compactness of the device is ensured; signal light pump light is coupled into an aluminum oxide strip waveguide with a large mode field area in a straight waveguide area, so that mode field overlapping of 980nm pump light and 1550nm pump light is improved, and amplification of the large mode field area is realized. According to the invention, large-mode-area on-chip optical waveguide amplification of 980nm pump light pumping is realized, and the large-mode-area on-chip optical waveguide amplification device has a wide application prospect in the field of integrated photoelectronics and the field of optical communication.

The application discloses a method for improving low-frequency precision of an atomic magnetometer, and relates to the technical field of weak magnetic detection. In the method, the closed-loop atomic magnetometer is in a zero-locking state, a direct-current bias system is automatically and accurately adjusted, the atomic magnetometer is caused to work in a critical interval between a zero-locking region and a linear region, the zero-locking region has the suppression on low-frequency magnetic noise, and the linear region has a higher response to a measured magnetic field, so that the low-frequency measurement precision of the atomic magnetometer is improved. The application is suitable for an optical pumping atomic magnetometer system, and is favorable for improving the precision and stability of the atomic magnetometer, and can significantly improve the magnetic field sensitivity in the low-frequency part.

A traceable multi-mode extremely weak magnetic field measuring device and method, comprising helium-3 atoms and an atomic magnetometer in a spin-exchange relaxation-free state, the helium-3 atoms polarized by metastable exchange optical pumping under an extremely weak magnetic field provide a traceable magnetic field value for the atomic magnetometer, the value is compared with the output response of the atomic magnetometer to obtain a calibrated scale factor of the atomic magnetometer, so that the measurement values of the atomic magnetometer are traceable. The atomic magnetometer meter head comprises four independent detection channels, the four detection channels are obtained by beam splitting of two detection lasers with different frequency detuning amounts, and the channels have high consistency. The method proposed by the application is compatible with the cooperative use of multiple probes, and can realize single-meter-head multi-channel measurement, meter-head internal magnetic field gradient measurement and meter-head inter-magnetic field gradient measurement three measurement modes, each mode has high consistency and high sensitivity.

The utility model belongs to the technical field of cesium optical pump magnetometers, and particularly relates to a split type cesium optical pump magnetometer, which comprises a data acquisition and processing module, and is characterized in that a connecting line I is mounted on the surface of one side of the data acquisition and processing module, and an electronic component module is mounted at one end, far away from the data acquisition and processing module, of the connecting line I; a second connecting line is installed on the surface of the side, away from the first connecting line, of the electronic assembly module. The components of the device adopt a split design, are connected through a connecting line, are convenient to install on an unmanned aerial vehicle, can simultaneously collect by a plurality of cesium optical pump probes, have the characteristics of high sensitivity, good stability, high precision and the like, can separate cesium optical pump signal generation from signal conversion, and can connect a plurality of cesium optical pump signal units by using one signal conversion unit. The method achieves the centralized transmission and control of cesium optical pump data, and plays an important role in the fields of military affairs, geophysical exploration and the like.

This invention discloses a non-equilibrium optical pump source with a rise time on the order of nanoseconds to sub-nanoseconds and its operating method. This invention integrates a collimating mirror, a reflecting mirror, a beam splitter, a light-absorbing plate, a hemispherical mirror, an aperture, a converging lens, a high-speed motor, a turntable, and a diffuse reflection assembly to obtain a non-equilibrium optical pump source with a rise time on the order of nanoseconds to sub-nanoseconds. By reducing the spot size, increasing the rotation speed, and increasing the turntable diameter, the signal rise time can be compressed to the order of nanoseconds to sub-nanoseconds. This effectively solves the problem of inaccurate time constant measurement caused by the excessively long rise time of the output signal of traditional mechanical choppers when measuring the response time of fast infrared detectors using the frequency descent method, thus achieving high-precision measurement of the infrared detector time constant.

The application discloses a kind of hollow light beam coherent array solid-state lasers, it is related to the technical field of laser, wherein, microstructure sheet and microstructure output layer adopt bonding mode connection;Array of hollow light field modulation structure is formed on microstructure sheet, pump source is used to emit pumping light, pump source and optical coupling system are relatively microstructure sheet and are matched to be set, so that pumping light can be coupled into microstructure sheet by optical coupling system, and hollow light beam array is formed by hollow light field modulation structure array;Hollow light beam array enters microstructure output layer by microstructure sheet, and forms coherent coupling and injection phase-locked in microstructure output layer, and outputs hollow light beam coherent array laser.Through the technical scheme of the application, high-power hollow light beam coherent array laser output can be obtained, and hollow light beam regulation is easy to realize, the scope of application is wide, and scalability is strong, and simple structure, low in cost, high in efficiency.

In at least one embodiment, the method is used to produce semiconductor lasers (1) and comprises the steps: - providing a plurality of laser emitters (2), at least one facet (22) of each of the laser emitters (2) being exposed, - electrically or optically pumping the laser emitters (2) such that the laser emitters (2) emit laser radiation (L), - generating a coating (3) on the facets (22), a local layer thickness (t) of the coating (3) over the facets (22) being determined by a local intensity of the laser radiation (L).

The invention belongs to the technical field of organic photoelectric semiconductor materials, and relates to a 2.7-bis (triphenylpyrimidine) fluorene compound and application thereof. The invention provides a 2.7-bis (triphenylpyrimidine) fluorene compound which has a linear symmetric structure, and the overall structure has high photoluminescence quantum efficiency and good film forming characteristics. The compound provided by the invention has the characteristic of amplified spontaneous emission, and can realize an extremely low ASE threshold value when being used as an optical gain medium. The 2.7-bis (triphenylpyrimidine) fluorene compound provided by the invention is easy to prepare and has a good application prospect in the fields of organic optical pump lasers and organic semiconductors.

The application discloses a kind of gas chamber polarization enhancement magnetometer based on multifocal holographic super surface and measuring method, belong to magnetic field measurement technical field.The magnetometer includes laser generation and control module, 1 / 4 wave plate, multifocal holographic super surface, optical magnetic resonance module, optical pumping signal post-processing module and reflector.Laser is collimated after 1 / 4 wave plate and is incident to multifocal holographic super surface, the super surface carries out phase control to incident light, makes multiple focal planes in different depths in gas chamber, improves the spatial uniformity of light pumping, enhances alkali atom polarization rate.Transmitted light enters optical pumping signal post-processing module, passes through polarizing beam splitter prism polarizing beam splitter prism, balanced differential detector and lock-in amplifier, extracts magnetic resonance signal and calculates magnetic field intensity.The application optimizes light pumping process, improves the stability and signal-to-noise ratio of magnetic measurement system, reduces measurement error, and is suitable for geomagnetic detection, biological magnetic signal detection and other high-sensitivity magnetic field measurement fields.

A method for atomic scalar magnetometry can include: (i) applying optical pumping to a vapor within a vapor cell; (ii) ramping off a pump power of the optical pumping over a time period; (iii) driving Rabi oscillations in the vapor by applying a microwave pulse sequence to the vapor, and (iv) determining a magnetic field strength by measuring frequency of the Rabi oscillations.

The invention discloses a compact arbitrary transverse mode laser. The laser comprises a pumping source, a pumping focusing optical system, a laser total reflective mirror, a laser gain medium, a laser output mirror and an astigmatism mode converter, the pumping source emits pumping light in a gain medium absorption band; the pump light is focused and then enters the gain medium; the gain medium absorbs the pump light and generates laser gain; the total reflective mirror highly reflecting laser wavelength and the output mirror partially transmitting the laser wavelength jointly form a simple linear resonant cavity. When the laser gain medium is inclined by a preset angle relative to the optical axis of the resonant cavity, meridian light and sagittal light pass through different optical paths of the gain medium to introduce astigmatism, an HG mode facing the directions of two astigmatism symmetry axes can be reproduced, and modes facing other directions cannot be reproduced due to the astigmatism effect. Therefore, when the pump light deviates from the axis of the resonant cavity in the directions of the two astigmatic symmetry axes, any high-order HG mode with mode ordinal numbers not being zero in the two directions can be excited, and any LG mode laser can be generated through astigmatic mode conversion.

The invention relates to a sensor head (4a-d) for a frequency analyzer (2a-d) comprising a crystal defect resonator (20a-d), an optical pump emitter (14) for exciting the crystal defect resonator (20a-d), a magnetic field unit (30) for generating a magnetic field with a magnetic field gradient along the crystal defect resonator (20a-d), an RF waveguide (22) and a radiation detector (10) for detecting luminescence radiation (42) from the crystal defect resonator (20a-d). To achieve easy manufacturability of the frequency analyzer (2a-d), it is proposed that the crystal defect resonator (20a-d) has a polycrystalline structure.

The invention relates to the field of optoelectronic devices, in particular to a low-linewidth-broadening-factor semiconductor gain chip which comprises a substrate layer and an epitaxial layer prepared on the substrate layer, a ridge waveguide is formed on the epitaxial layer in an etching mode, an insulating layer with a reserved current injection port is prepared on the surface of the ridge waveguide, and a P-type electrode is prepared on the surface of the insulating layer. The P-type electrode injects current into the ridge waveguide only from the current injection port; the semiconductor gain chip is divided into a pumping region and an amplification region, the P-type electrode comprises a pumping region electrode and an amplification region electrode which are independently powered, differential current is injected into the pumping region and the amplification region through the pumping region electrode and the amplification region electrode, and active selection of working energy levels of the chip is realized through a working mechanism of internal optical pumping; therefore, the line width broadening factor is directly reduced. According to the invention, high-energy-level excitation can be realized under a conventional working current, so that the linewidth broadening factor is remarkably reduced, and an ultra-narrow linewidth laser with narrower linewidth output below kHz can be realized.

The invention discloses a strain monitoring system and an optical cable construction technology, and belongs to the technical field of pipelines. According to the system, pump light and detection light are respectively emitted from two ends of a sensing optical cable, the pump light and the detection light generate Brillouin scattering, Brillouin scattering light is emitted from the sensing optical cable and enters an optical detector, the optical detector converts an optical signal into an electric signal and sends the electric signal to electronic equipment, and the electronic equipment sends the electric signal based on the electric signal. And determining the strain conditions of the pipeline body and the nearby soil body. Since one part of the sensing optical cable is laid on the surface of the pipeline and the other part of the sensing optical cable is located in the soil body near the pipeline, the optical signal received by the optical detector can reflect the stress condition of the pipeline body and the soil body near the pipeline body. The electronic equipment not only can determine the strain condition of the pipeline body, but also can determine the strain condition of the soil body near the pipeline based on the electric signal converted from the optical signal, so that the pipeline body and the soil body near the pipeline are jointly monitored, and the monitoring comprehensiveness is improved.

The invention belongs to the technical field of laser, and particularly discloses a low-quantum-loss laser chip and laser, and the laser chip comprises a substrate, a dual-wavelength high-reflectivity mirror, a gain region, an anti-diffusion layer and a cap layer which are sequentially arranged. The dual-wavelength high-reflectivity mirror comprises a plurality of reflection groups which are arranged in sequence, each reflection group comprises a high-refractive-index layer and a low-refractive-index layer, and the high-refractive-index layers and the low-refractive-index layers are arranged alternately; the optical thickness d light of the high refractive index layer and the low refractive index layer is equal to (lambda pump + lambda laser) / 8; the gain region comprises a plurality of gain groups which are sequentially arranged, each gain group comprises a high barrier layer and a low barrier layer, and the high barrier layers and the low barrier layers are alternately arranged. The low-potential barrier layer is directly pumped, and the required pumping photon energy is close to the laser photon energy, so that the quantum loss in the laser generation process is small, the waste heat in the chip is less, the heat effect of the laser is greatly reduced, the light-light conversion efficiency is high, and the overall output power of the laser is also greatly improved.

The present invention relates to an atom sensor system (1) comprising a vapor cell (2) comprising an alkali metal vapor, a pump laser system (3) configured to generate an optical pump beam (4) along a first axis (5) through the vapor cell (2), a magnetic field system (6) configured to generate a magnetic field along the first axis (5) through the vapor cell (2), and a probe laser system (7) configured to generate an optical probe beam (8) along a second axis (9) through the vapor cell (2). The present invention is based on the general idea that the atom sensor system (1) comprises a Fabry-Pérot resonator (10), wherein the alkali metal vapor of the vapor cell (2) is located inside the Fabry-Pérot resonator (10).

The utility model provides a cesium optical pump magnetometer for aviation magnetic exploration, which relates to the technical field of cesium optical pump magnetometers, and comprises a fuselage, a rotor wing is arranged on the surface of the fuselage, an undercarriage is arranged on the side surface of the fuselage, a battery pack is arranged on the bottom surface of the fuselage, and a connecting ring is fixedly mounted on the surface of the undercarriage. A fixing rod is fixedly installed in the connecting ring, a magnetic detection mechanism is fixedly installed on the bottom face of the machine body, a positioning antenna is arranged, the real-time target positioning and target positioning calibration functions are supported, demagnetization treatment is further conducted according to the working characteristics of a magnetic detector, high-strength carbon fibers, aviation aluminum alloy, current shielding and motor power demagnetization are adopted, and the magnetic detector can be used for detecting the target position. Light-weight high-strength materials of carbon fibers, aeronautical aluminum alloy and lithium polymers are adopted to form independent modules, the overall performance is improved, the overall weight is reduced, flight stability is kept, a high-strength lengthened carbon fiber fixing rod and titanium alloy are adopted to serve as a magnetic sensor support, and stability of the magnetic sensor in aerial operation is guaranteed.

An optically pumped magnetic sensor (1) comprises: a pump light source (60) that emits pump light (61); a detector (30) that outputs the result of detecting the pump light (61) emitted from the pump light source (60); two glass cells (11, 12) that are arranged so as to be aligned on the same path of the pump light from the pump light source (60) to the detector (30) and that each include gaseous atoms that are excited by the pump light; a magnetic field coil (21) that applies a first alternating-current magnetic field to one glass cell (11); a magnetic field coil (22) that applies a second alternating-current magnetic field with a phase inverted from that of the first alternating-current magnetic field to the other glass cell (12); and an output device (40) that outputs a value obtained by differentiating the output of the detector (30).

The invention provides an adaptive coincidence gate width optimization quantum imaging method based on a scattering free path. Firstly, pump light pumps a PPKTP crystal, and an entangled photon pair is generated through the SPDC process; then, separating the photons by using a PBS (Phosphate Buffer Solution), transmitting the photons along a reference light path and a signal light path containing a scattering environment respectively, and acquiring a photon arrival time sequence by a corresponding detector; thirdly, simulating a transmission process of signal photons in a scattering environment based on a Monte Carlo method, calculating a total scattering free path, counting the number of photons of each pixel point under different scattering times, and further screening out the optimal scattering times with the maximum number of photons; then, calculating a delay inequality according to a minimum total scattering free path corresponding to the optimal number of scattering times, and determining a self-adaptive coincidence gate width in combination with a fluctuation range of the total scattering free path; and finally, correcting a signal photon arrival time sequence by using the delay inequality, completing pixel-by-pixel coincidence counting based on the corrected time sequence and the coincidence gate width, and obtaining a quantum grayscale image through linear mapping.

The invention relates to the technical field of data processing, and further relates to a data extraction method and system for digital geological mineral exploration. Comprising the following steps: step 1, performing analog-to-digital conversion on multiple paths of original magnetic field response voltage signals synchronously acquired by multiple optical pump atomic magnetometer sensing units to obtain multiple paths of original magnetic field response digital sequences; 2, performing phase gradient field iteration reconstruction processing on the magnetic field in-phase response matrix and the magnetic field orthogonal response matrix to obtain a reconstructed phase matrix and a magnetic field amplitude matrix; and 3, calculating a magnetic field amplitude deviation matrix and a phase deviation matrix according to the magnetic field amplitude matrix and the reconstructed phase matrix, converting the mineral anomaly candidate position into a geological space coordinate, and outputting geological mineral anomaly feature data.

The invention belongs to the technical field of semiconductor laser pumping solid lasers, and discloses a semiconductor side pumping solid laser module based on a multi-cavity reflection light-gathering cavity, which comprises a multi-cavity reflection light-gathering cavity (2), an elliptical cavity and a semicircular cavity which are formed in the multi-cavity reflection light-gathering cavity (2), and the inner walls of the elliptical cavity and the semicircular cavity are reflecting surfaces. An LD bar (1) and a thin rod type laser working medium (3) are arranged in the multi-cavity reflection condensation cavity (2), pump light emitted by a luminous point of the LD bar (1) is reflected by the inner wall and then converged at the axis position of the thin rod type laser working medium (3), residual pump light absorbed by the thin rod type laser working medium (3) is reflected back to the thin rod type laser working medium (3) again, and the residual pump light is converged at the axis position of the thin rod type laser working medium (3). And residual pumping light energy is absorbed again, so that high-efficiency pumping is realized. According to the invention, the utilization efficiency of pump light energy is improved, and under the same laser output power, the volume, weight and power consumption indexes of the pumping part of the laser are reduced.

The application provides a femtosecond laser electron dynamic control phase change material cross-scale modulation device and method, and the device comprises a femtosecond laser, a first beam splitter, a frequency doubler, a fold mirror, a first ultrafast mirror, a second ultrafast mirror, a third ultrafast mirror, a fourth ultrafast mirror, a fifth ultrafast mirror, a sixth ultrafast mirror, a collinear optical parametric amplifier, a beam reducer, a time-domain shaping module and a descending light path; the femtosecond laser generates laser pulses, which are divided into pump light and probe light through the first beam splitter; the pump light is focused on the surface of a sample to be measured after processing; the probe light is focused on the surface of the sample to be measured after processing, and a collection signal is obtained. The application realizes the superposition of the functions of two types of devices, i.e. an ultrafast optical switch and an optical storage, and overcomes the difficulty in integrating optical and electrical devices with different response times in different scales due to different response principles. The application has important application value in the integration and miniaturization of optical and electrical devices.

The invention discloses a high-efficiency visible light super-continuum spectrum generation method and device based on a green light pumping gradient refractive index multimode fiber, and belongs to the technical field of fiber laser. According to the method, a pulse green laser is adopted as a pumping source, the pulse green laser is coupled into a parameter-optimized multimode optical fiber with the gradient refractive index, and the gradient refractive index is obtained by exciting the synergistic effect of nonlinear effects such as geometric parameter instability and light beam self-cleaning which are unique in the optical fiber. And the high-flatness super-continuum spectrum covering the whole visible light wave band is directly and efficiently generated. The defects that a traditional photonic crystal fiber scheme is low in conversion efficiency and poor in flatness in the visible light wave band are overcome, the range and shape of an output spectrum can be accurately regulated and controlled by flexibly designing the fiber core radius, the numerical aperture and the length of the fiber, and meanwhile it is guaranteed that an output light beam is close to the diffraction limit through the light beam self-cleaning effect. According to the scheme, the system is simple in structure and high in robustness, and a novel, reliable and practical way is provided for achieving a high-performance visible light super-continuum spectrum light source.