105 results about "Stimulate raman scattering" patented technology

The invention relates to the technical field of spectrum detection and optical imaging, and provides a time domain stimulated Raman scattering method and system.The method comprises the steps that pumping pulses or Stokes pulses are modulated, two stimulated Raman excitation pulse pairs with adjustable relative delay are introduced, a to-be-detected sample is excited to generate transient stimulated Raman scattering, and the time domain stimulated Raman scattering is obtained; transient stimulated Raman scattering signals can be obtained, acquisition of hyperspectral data covering hundreds of wave numbers can be achieved only through single excitation, and the method has the advantage of being high in time resolution. Meanwhile, the spectral resolution of the vibration level life broadening limit can be obtained through the method, and the main technical bottleneck faced by the traditional stimulated Raman scattering spectrum technology can be solved at a time. The method can be applied to the fields of Raman scattering imaging, spectrum detection, related Raman probes and the like.

Disclosed herein are methods, devices, apparatuses, and non-transitory computer readable media for signal communication via hollow fiber using stimulated Raman scattering (HC-SRS). Such use of HC-SRS can cause amplification of the signal as it is transmitted through the hollow fiber. Such use of HC-SRS may have (A) reduced signal loss during transmission, (B) reduced latency time as compared to optical signal propagating through a solid core optical fiber, (C) increase a distance between repeaters required for signal transmission, or (D) any combination of (A) (B) and (C); with any of (A) and (C) being compared to any of the currently used signal transmission methodologies disclosed herein.

The invention discloses a tunable excited Raman spectrum microimaging method and device, and belongs to the field of spectrum detection and optical imaging. The device comprises a broadband adjustable wavelength light source, a high-resolution wavelength scanning module, a stimulated Raman signal excitation module and a stimulated Raman signal detection module. The stimulated Raman signal excitation and imaging module is used for focusing the two beams of narrow-band femtosecond pulse light which are overlapped in time and space on a sample and exciting a stimulated Raman signal, and meanwhile, moving the sample to realize spot scanning microscopic imaging; and the stimulated Raman signal detection module is used for converting the stimulated Raman scattering signal into an electric signal, demodulating the electric signal by using a lock-in amplifier, and recording spectral information by using a data acquisition card. According to the invention, the broadband tunable characteristic of the optical parametric amplifier is utilized to tune the pump light to the wavelength region of the sample absorption peak length so as to realize electron pre-resonance stimulated Raman; and a balance detection technology is combined at a detection end, so that high-sensitivity, high-resolution and high-signal-to-noise-ratio detection of stimulated Raman signals is realized.

The invention relates to a device and a method of a high-sensitivity suspension single-droplet sensor for monitoring PM2.5 pollution, belongs to the technical field of aerosol microdroplet spectrum trace analysis, and solves the problem that ppb-magnitude gas cannot be monitored in the prior art. The method comprises the following steps: pumping aerosol into a sample cell of a droplet suspension system in a single droplet form; introducing required reaction gas into the sample pool through an atmosphere control system; scattered light signals of the single liquid drops are respectively input into the dynamic signal processing system and the microdroplet imaging system; acquiring the characteristic peak displacement change of the metal ion sensing microdroplet; establishing a gas particle distribution Mie scattering inversion model based on micro-droplet dynamic response; inverting the radius of the liquid drop according to the stimulated Raman scattering / stimulated elastic scattering signal; according to the quantitative relationship of the reaction, calculating the generation of sulfate by the droplet suspension system (sensor); and judging which gas in the actual atmosphere is a main oxidation pathway for oxidizing sulfur dioxide to generate sulfate pollutants according to a calculation result.

The invention belongs to the field of plant insect-resistant characteristic analysis, and particularly discloses a real-time in-situ detection method and system for the insect-resistant level of a plant, and the method specifically comprises the following steps: after a to-be-detected plant is irradiated by ultraviolet light of different doses, a hyperspectral stimulated Raman scattering imaging subsystem is adopted to carry out stomata imaging and spectral signal acquisition on leaves of the to-be-detected plant; performing qualitative analysis on different metabolites in the leaves by adopting spectral signals of different wavebands, and performing quantitative detection on the metabolites in combination with characteristic peak areas and peak intensity characteristics; acquiring pore structure change based on pore imaging; and calculating the correlation between the pore structure and metabolite change of the plant caused by different irradiation and the insect resistance, thereby realizing in-situ detection of the insect resistance of the plant. According to the method provided by the invention, the complex process of plant disease and insect pest resistance can be comprehensively analyzed, and the non-invasiveness, high specificity and qualitative and quantitative capability can provide important theoretical basis and practical guidance for developing a green disease and insect pest control technology.

The invention belongs to the technical field of optical microscopic imaging, and particularly relates to a coherent Raman microscopic imaging method based on a planar parallel microcavity. According to the invention, a plane parallel micro-cavity structure, namely a Fabry-Perot resonant cavity, is used for traditional coherent Raman microscopic imaging for the first time, micro-cavity structures with different reflectivity coating films are designed, and coherent anti-Stokes Raman scattering and stimulated Raman scattering processes are respectively regulated and controlled. And coupling the spatial structure information of the sample with a Raman signal to generate a new spectrum and image, and respectively realizing cavity-enhanced coherent anti-Stokes Raman scattering imaging and cavity-enhanced stimulated Raman scattering imaging. Compared with traditional coherent Raman microscopic imaging, the signal intensity is improved, spatial structure information and chemical information of a sample are obtained at the same time, so that more-dimensional information of the sample is provided, and compared with traditional biological microcavity sensing imaging, rapid unmarked imaging can be achieved; the method has wide application prospects in the fields of biomedical detection and the like.

The invention relates to the technical field of optical fiber lasers, and provides an ultra-wideband tunable optical fiber communication light source based on gas stimulated Raman scattering. Comprising a 1 [mu] m wave band seed source, an electro-optical modulator, a signal generator, an optical fiber amplifier, a solid core-hollow core compact coupling device, an optical fiber end cap, a hollow core optical fiber, a miniature gas cavity, a lens and a dichroic mirror, and the tuning range of the methane gas 1 [mu] m wave band tunable pumping source at least covers 1024-1126 nm. The laser can be converted into communication wave band laser covering the whole S + C + L + U wave band, and benefited from the Raman characteristic of methane molecules, the output laser under single wavelength pumping has a corresponding narrow-linewidth single spectral line, no accompanying ASE noise amplification and the like, and secondary filtering is not needed for selection; and meanwhile, the use of the hollow-core optical fiber ensures that the output laser is only a single mode, and high beam quality can be ensured without other operations.

Multiplex CARS microscopy device for analysing a sample (Ech) comprising: -a laser source (LS) suitable for emitting a primary beam (FP) having a first wavelength λ1, in the form of pulses (IL1) with a power called the primary power; -an optical fibre (F) supporting fewer than ten modes, said pulses propagating through the optical fibre (F) in anomalous dispersion regime so as to generate, from the primary beam, an output beam (FSC) containing a plurality of second wavelengths forming a supercontinuum (SC), and said first wavelength λ1, the second wavelengths being generated by non-linear conversion of the first wavelength λ; -an optical system (MO) suitable for focusing the output beam onto said sample, so as to generate an anti-Stokes beam (STK) via stimulated Raman scattering induced by at least one of the second wavelengths and the first wavelength λ1 present in the output beam; -a photodetector (Det) suitable for detecting the anti-Stokes beam.

Systems, methods and devices for determining the identity of one or more nano-particles that share a defined set of spectral features above a detection limit, comprising obtaining SRS spectrum data from a multiphoton laser scanning microscope configured to perform hyperspectral stimulated Raman scattering microscopy; generating, by the machine learning module trained using a training set, the identity of one or more particles, based on the SRS spectrum data wherein the training set comprises real and / or synthetic data of SRS spectra, associated with respective particle identities and based on bulk standard spectra, estimated frequency uncertainty, and estimated instrumental noise wherein the machine learning module generates the particle identity based on respective spectral matching coefficients (SMC SRS) of the detected SRS spectrum data obtained and from the training set.

The present disclosure provides computer-implemented methods, systems, and devices for non-invasively measuring a level of an analyte in a user using Stimulated Raman Scattering. A device can include a Raman pump source that, when engaged, emits pump light toward a skin surface of the user at a pump wavelength. The device can further include a Stokes source that, when engaged, emits Stokes light toward the skin surface at one or more Stokes wavelengths. The device can further include a photodetector that measures light that emanates from the skin surface. The device can further include control circuitry configured to pulse modulate the Raman pump source and the Stokes source in accordance with at least one duty cycle. The device can further include a processor that processes the measured light to provide an estimated analyte level of the analyte in the user.

The invention belongs to the field of devices for high-power fiber lasers, particularly relates to a long-period fiber grating capable of dynamically suppressing stimulated Raman scattering of different wavelengths and a suppression method, and aims to solve the problem that the stimulated Raman scattering effect under different wavelengths cannot be dynamically adapted and suppressed. A pumping source is connected with one end of a beam combiner, the other end of the beam combiner is connected with one end of a resonant cavity, the other end of the resonant cavity is connected with one end of a long-period fiber bragg grating, the other end of the long-period fiber bragg grating is connected with one end of a stripper, the other end of the stripper is connected with an output end, and the output end is connected with a spectrograph. Wherein the resonant cavity is used for oscillating and amplifying spontaneous radiation light with a set wavelength; the two ends of the long-period fiber grating are fixed to the stress field applying device, and the long-period fiber grating is arranged in the temperature field applying device. According to the invention, stimulated Raman scattering of different wavelengths is effectively inhibited, the output power, the beam quality and the system stability of the laser are improved, and the service life is prolonged.

The invention belongs to the technical field of laser, and discloses a room-temperature high-energy deep ultraviolet laser generating device based on second-order and third-order nonlinear effects, which comprises a Raman crystal, a frequency doubling crystal, a frequency quadruplicating crystal, a sum frequency crystal and a color separation mirror, the fundamental frequency light is subjected to stimulated Raman scattering in the Raman crystal to generate Stokes light, and the frequency doubling crystal performs frequency doubling on the residual fundamental frequency light to generate second harmonics; frequency doubling is carried out on the second harmonic in the quadruplicated frequency crystal to generate a fourth harmonic; and the sum frequency crystal carries out sum frequency on the Stokes light and the fourth harmonic wave to finally obtain the deep ultraviolet laser with the 216.3 nm wave band. According to the invention, non-linear optical second-order harmonic conversion and third-order stimulated Raman scattering effects are combined, laser with the wavelength slightly longer than the wavelength of fundamental frequency light is obtained through stimulated Raman scattering, and the laser and fourth harmonic of fundamental frequency light are subjected to frequency summation in a large-aperture non-linear crystal under the room temperature condition, so that high-energy deep ultraviolet laser with the waveband of 210 nm is obtained.

The invention provides a C + L + S wave band multi-device configuration optimization method and device, and the method comprises the steps: calculating the approximate optimal transmission power of an optical fiber entrance part through employing a local optimal approximate global optimal algorithm; taking the approximate optimal transmitting power as the receiving power of each span section, and recalculating the transmitting signal power at the starting position of the span section by reversely solving a stimulated Raman scattering effect power evolution equation; the gain and gain slope of the optical fiber amplifier are set, so that the signal power which begins to be input in each span segment approaches the transmitting signal power; constructing a loss function based on the generalized signal-to-noise ratio of each wave band; and the gain and the gain slope set after inversion of the stimulated Raman scattering effect are used as initial values, and the gain and the gain slope of the optical fiber amplifier and the channel loss value of the wavelength selection switch are iteratively optimized by using a gradient rising algorithm and taking the loss function improvement as a target. According to the method provided by the invention, only a small amount of iteration is needed, the operation speed is high, and multi-device second-level configuration optimization of the broadband optical transmission system can be realized.

The invention provides a Raman spectrum calibration method and system based on transient stimulated Raman scattering. The Raman spectrum calibration method comprises the following steps: acquiring stimulated Raman signals in a time domain in a transient stimulated Raman scattering mode; the time delay of each sampling point of the time domain Raman signal is tracked in real time through the reference laser interference fringes, and Raman displacement after Fourier transform is determined; detecting an exciting light spectrum obtained by sampling through a photoelectric detector, and calculating excitation efficiency at different Raman displacement positions to obtain an excitation efficiency curve; the intensity of Raman spectrums at different Raman displacement positions is calibrated through the excitation efficiency curve, the self-calibrated Raman spectrums are obtained, the self-calibration transient stimulated Raman scattering technology inherits the advantages of high time resolution and high spectral resolution of the transient stimulated Raman scattering technology, the self-calibration transient stimulated Raman scattering technology is combined with a self-calibration mechanism, and the self-calibration effect of the self-calibration transient stimulated Raman scattering technology is improved. The influence of excitation light fluctuation is eliminated, the Raman spectrum measurement accuracy and repeatability are remarkably improved, and the quantitative analysis capability is comparable to that of spontaneous Raman spectrum.

An Optical Time-Domain Reflectometer (OTDR) trace correction method, an electronic device, and a storage medium are disclosed. The method may include: establishing a parameter decoupling equation according to a fiber loss coefficient and a Stimulated Raman Scattering (SRS) transfer coefficient in response to ignoring an SRS transfer amount amplified or absorbed by an OTDR wavelength in an Optical Transport Network (OTN) service; disabling a service wavelength of an OTN of an optical fiber transmission system, and acquiring, according to the parameter decoupling equation, a first OTDR trace of an OTDR simulation wavelength in the optical fiber transmission system when the service wavelength of the OTN is in a disabled state; determining a fiber loss coefficient according to the first OTDR trace.

The present application belongs to the field of optical microscopic imaging technology, and particularly relates to a coherent Raman microscopic imaging method based on a plane-parallel microcavity. The present application first applies a plane-parallel microcavity structure, i.e. a Fabry-Perot resonant cavity, to a traditional coherent Raman microscopic imaging, designs a microcavity structure with different reflectivity coating, and respectively controls coherent anti-Stokes Raman scattering and stimulated Raman scattering processes, so as to couple spatial structure information of a sample and Raman signals to generate new spectra and images, and respectively realize cavity-enhanced coherent anti-Stokes Raman scattering imaging and cavity-enhanced stimulated Raman scattering imaging. Compared with the traditional coherent Raman microscopic imaging, the present application improves signal intensity, and simultaneously acquires spatial structure information and chemical information of a sample, so as to provide more dimensional information of the sample, and compared with the traditional biological microcavity sensing imaging, can realize fast and label-free imaging, and has wide application prospects in the fields of biomedical detection and the like.

The invention relates to the technical field of ultrafast laser, in particular to an ultraviolet laser damage inhibition method and device for a fused quartz optical element, and the method comprises the steps: obtaining oxy-18 modified DKDP crystals with oxy-18 isotope abundance higher than natural abundance; preparing the oxy-18 modified DKDP crystal into a wave plate matched with a preset ultraviolet laser wavelength; in an ultraviolet laser light path of a laser inertial confinement fusion device, a wave plate is arranged between a linear polarization state output end of ultraviolet laser and a fused quartz optical element; and enabling ultraviolet laser to sequentially pass through the linear polarization state output end and the wave plate to form circularly polarized light, and irradiating the circularly polarized light to the fused quartz optical element. The invention aims to realize the small-scale self-focusing effect of actively inhibiting fused quartz and solve the technical problem that a traditional material cannot be used as a large-aperture wave plate due to over-high transverse stimulated Raman scattering.

The invention relates to the technical field of optical fiber lasers, and proposes an ultra-wideband tunable optical fiber communication light source based on gas stimulated Raman scattering, comprising a 1μm band seed source, an electro-optic modulator, a signal generator, an optical fiber amplifier, a solid-hollow compact coupling device, an optical fiber end cap, a hollow-core optical fiber, a micro gas cavity, a lens, a dichroic mirror, and a methane gas 1μm band tunable pump source. The tuning range covers at least 1024nm-1126nm. Based on the stimulated Raman scattering effect of methane gas, it can be converted into a communication band laser covering the entire S+C+L+U band. Thanks to the Raman characteristics of methane molecules, the output laser has a corresponding narrow line width single spectral line under single wavelength pumping, without accompanying ASE noise amplification, etc., and does not need to be selected through secondary filtering. At the same time, the use of the hollow-core optical fiber ensures that the output laser is only single-mode, and high beam quality can be guaranteed without other operations.

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.

A pulse generation unit generates a driving voltage signal including a pulse signal. A laser oscillation module oscillates a laser beam by carrying out, based on the driving voltage signal, a pulse oscillating operation. When the power command signal has a voltage command value corresponding to a laser power greater than a predetermined laser power during a high period, the pulse generation unit modulates, in a pulsed manner, a voltage value of the high period of the driving voltage signal so as to alternately repeat, for a preset period of time from a rising time of the high period of the driving voltage signal, a high state in which the voltage value is maintained and a low state in which the voltage value is lowered by a predetermined voltage value without being lowered to a voltage value of a low period of the driving voltage signal.

The invention discloses a handheld rapid three-dimensional fundus blood supply imaging system and method.The system comprises an upper computer, a laser excitation module, a probe, a data collection module and a space positioning module, the laser excitation module, the probe, the data collection module and the space positioning module are connected with the upper computer, and the laser excitation module conducts wavelength conversion on input pump laser through the stimulated Raman scattering principle to generate excitation light; the exciting light is then transmitted to the probe for high-speed scanning, the probe receives real-time pose feedback of the space positioning module at the same time so as to eliminate the influence of operation jitter, the data acquisition module pre-processes a photoacoustic signal acquired by the probe and then transmits the photoacoustic signal to the upper computer, and a distribution diagram is generated through an image reconstruction algorithm and analyzed. According to the invention, four clinical troubles of poor molecular specificity, depth-resolution imbalance, low clinical adaptability and deficiency of quantitative standards in the existing imaging technology are fundamentally solved, and a universal tool is provided for early screening of eye ground ischemic diseases.

The present disclosure provides computer-implemented methods, systems, and devices for non-invasively measuring a level of an analyte in a user using Stimulated Raman Scattering. A user computing device includes a Raman pump source that emits pump light toward a skin surface of the user at a pump wavelength. The device includes a Stokes source that emits Stokes light toward the skin surface at a plurality of Stokes wavelengths within a window of Raman measurement wavelengths. The Stokes light comprises a plurality of narrowband emissions at a respective plurality of center wavelengths ranging across the window of Raman measurement wavelengths. The device includes a photodetector that measures light that emanates from the skin surface. The device includes a processor that processes the measured light to provide an estimated analyte level of the user.

An optical arrangement for adjusting the wavelength of light, comprising: a first light source arranged to generate a first beam of light at a first wavelength; a second light source arranged to generate seed light at a second wavelength; a first Raman shifting medium arranged to receive the light from the first light source in combination with the seed light from the second light source, and to produce, by stimulated Raman scattering, output light at the second wavelength and having temporal properties determined by those of the first beam of light; a third light source arranged to generate seed light at a third wavelength; and a second Raman shifting medium arranged to receive the output light from the first Raman shifting medium in combination with the seed light from the third light source, and to produce, by stimulated Raman scattering, output light at the third wavelength and having temporal properties determined by those of the output light from the first Raman shifting medium; wherein the third wavelength is greater than the second wavelength, and the second wavelength is greater than the first wavelength; wherein the frequency difference between the first beam of light and the seed light from the second light source is a frequency difference where the first Raman shifting medium exhibits Raman gain; and wherein the frequency difference between the output light from the first Raman shifting medium and the seed light from the third light source is a frequency difference where the second Raman shifting medium exhibits Raman gain. Also provided is a corresponding method of adjusting the wavelength of light.

The application discloses a kind of multi-channel wide spectrum scattered light energy simultaneous measurement device and method, wherein multi-channel wide spectrum scattered light energy simultaneous measurement device mainly includes target chamber, spectrometer, gate camera and multiple scattered light imaging light paths.The present multi-channel wide spectrum scattered light energy simultaneous measurement device and method are used, by setting multiple scattered light imaging light paths, realize multi-channel measurement capability, can accurately give the energy of different wavelengths and total energy, realize the simultaneous measurement of stimulated brillouin scattering and stimulated raman scattering scattered light, provide more reliable diagnostic techniques for the scattered light generated by laser target shooting;At the same time, the present measurement method greatly reduces the use of energy probe, not only saves cost, but also improves diagnostic efficiency;And, the present measurement method can be used not only for high-energy scattered light measurement, but also for other light source intensity analysis and comparison.

The application discloses a few-mode fiber double-cascaded mode converter and a high-power few-mode fiber laser. A core base mode and a core high-order mode converter and a core high-order mode and a cladding mode converter are cascaded on the few-mode fiber. The refractive index modulation distribution of the core base mode and the core high-order mode converter is uniformly distributed in the core center, and is used for coupling the core base mode to the core high-order mode. The refractive index modulation distribution of the core high-order mode and the cladding mode converter is distributed at the junction of the core and the cladding, and is used for coupling the core high-order mode to the cladding to form loss. The few-mode fiber double-cascaded mode converter is connected before an output end cap of the high-power few-mode fiber laser, and can inhibit stimulated Raman scattering in the large-mode-field few-mode fiber laser, so as to improve the output performance of the fiber laser.

The invention relates to the field of chemical oxygen-iodine lasers, in particular to a mid-infrared wavelength conversion method and device of a chemical oxygen-iodine laser. Firstly, a pair of pulsed magnetic field generators is placed on the upper side and the lower side of a gain area of an original continuous wave chemical oxygen-iodine laser; the hydrogen Raman pool is used as a magnetic gain switch to enable the laser to output laser pulses with higher peak power, then 1315nm wavelength laser output by the oxygen-iodine chemical laser is guided into the hydrogen Raman pool, the original 1315nm wavelength laser is converted into 2900nm wavelength laser through Raman scattering to be output, finally, the 2900nm wavelength laser is guided into the vacuum bin containing the iron-doped zinc selenide crystal, and the iron-doped zinc selenide crystal is obtained. And by pumping the iron-doped zinc selenide crystal, the laser with the wavelength of 2900 nm is further converted into intermediate infrared laser pulses with the wavelength of 4000-5000 nm. On the premise that the original laser structure is not influenced, the oxygen-iodine chemical laser has the possibility of being applied to the middle infrared band.

The invention belongs to the technical field of medical detection, and particularly relates to a method and a system for detecting urate crystal deposition and phagocytosis in synovial organ tissues. The system comprises a synovial organ culture and verification module used for obtaining a human synovial sample, performing synovial tissue culture and forming different synovial organs; the stimulated Raman scattering microscope imaging module is used for imaging the cultured synovial organs; specifically, a specific pump-Stokes wavelength combination, a spatial deposition quantitative analysis and detection module of urate crystals and a spatial phagocytosis quantitative analysis and detection module of urate crystals are adopted; according to the method, the spatial deposition conditions of urate crystals in different synovials and the phagocytosis of osteoarthritis synovial cells on the crystals can be effectively imaged, and the unit quantity density and the intensity density of deposited or phagocytosed crystals are quantitatively calculated and analyzed; therefore, guidance is provided for development of related basic research and clinical quantitative diagnosis of gout.

The utility model relates to a laser and high-brightness fiber laser processing equipment, the laser comprises a signal beam combiner, an energy transmission optical cable and N groups of laser modules, N is an odd number greater than or equal to 3; the central wavelengths of lasers output by the laser modules are different, and each laser module comprises a plurality of independent laser units; a group of laser modules with the largest number of laser units is used as a central group; the other groups of laser modules serve as edge groups; and the edge group is positioned at the edge of the central group and is connected with the input end of the signal beam combiner, so that the stimulated Raman scattering intensity of the output laser beam combined by the signal beam combiner is obviously reduced. According to the laser beams output by the laser, the superposed stimulated Raman scattering intensity is far smaller than the stimulated Raman scattering intensity of the combined beams of the laser modules with the same number and the same central wavelength, so that the laser can be transmitted in an energy transmission optical cable with a thinner fiber core and smaller NA, and the laser has higher brightness.

The invention discloses a high-power high-peak optical fiber laser and a using method, the laser comprises a seed source and a three-stage amplifier, a third gain optical fiber of a tail-end amplifier adopts a special structural design, and a central transmission layer is made of a high-damage-threshold or low-nonlinearity material, so that the nonlinear refractive index of the optical fiber is reduced; the occurrence probability of stimulated Brillouin scattering and stimulated Raman scattering is reduced; meanwhile, the continuous gradually-changing core diameter structure of the central transmission layer can dynamically adjust light field distribution, avoid power density concentration and further suppress the thermally-induced self-focusing effect, so that the laser can still work stably when the average power of the laser breaks through the kilowatt level and the peak power of the laser breaks through the megawatt level, and the power output upper limit is remarkably improved; by optimizing the gain optical fiber structure and the multi-stage amplification link, the nonlinear effect is effectively inhibited, the laser output power and stability are improved, and the device is suitable for the high-end fields of industrial manufacturing, aerospace and the like.

The present invention relates to a multi-channel laser hydrogen sensor system for hydrogen pipelines, which includes a host, a micro-nano fiber sensing probe, and a connecting optical cable. The host includes a power conversion unit, a laser control and signal processing circuit, a distributed feedback (DFB) laser, an erbium-doped fiber amplifier module EDFA, an optical switch and data control circuit, an optical switch, a wavelength division multiplexer (WDM), and an optical fiber connector. Multiple micro-nano fiber sensing probes can be connected in the system of the present invention. The probes are respectively installed at the joints of the hydrogen pipelines and are connected to the host through the connecting optical cable. The micro-nano fiber sensing probe detects the hydrogen concentration based on the stimulated Raman scattering effect of light, and the system realizes time division multiplexing by switching different probes through the optical switch. The present invention will achieve multi-point remote leakage monitoring of hydrogen pipelines, with high sensitivity and fast response speed.