87 results about "Stimulate raman scattering" patented technology

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.

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 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 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.

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 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.

Embodiments of the present application provide an OTDR trace correction method, an electronic device, and a storage medium. The method comprises: when a stimulated Raman scattering (SRS) transfer amount amplified or absorbed by an OTDR wavelength in an optical transport network (OTN) service is ignored, establishing a parametric decoupling equation according to an optical fiber loss coefficient and an SRS transfer coefficient (201); disabling an OTN service wavelength of an optical fiber transmission system, and according to the parametric decoupling equation, acquiring a first OTDR trace of an OTDR simulation wavelength in the optical fiber transmission system when the OTN service wavelength is in a disabled state (202); determining the optical fiber loss coefficient according to the first OTDR trace (203); enabling the OTN service wavelength, and according to the parametric decoupling equation, acquiring a second OTDR trace of the OTDR simulation wavelength in the optical fiber transmission system when the OTN service wavelength is in an enabled state (204); determining the SRS transfer coefficient according to the first OTDR trace and the second OTDR trace (205); and acquiring an OTDR test wavelength, and correcting an OTDR test trace of the OTDR test wavelength in the optical fiber transmission system according to the optical fiber loss coefficient and the SRS transfer coefficient (206).

This invention relates to the field of high-power fiber laser technology and discloses a method for synergistically suppressing stimulated Raman scattering and mode instability effects in fiber lasers. The fiber laser includes a pump module and a gain module. The gain module includes a gain fiber. By inserting a section of all-solid-state photonic bandgap fiber in the middle of the gain fiber, the synergistic suppression of stimulated Raman scattering and mode instability effects is achieved. The high-loss characteristic of all-solid-state photonic bandgap fiber in the Raman band is used to suppress stimulated Raman scattering. At the same time, the high-loss characteristic of all-solid-state photonic bandgap fiber for higher-order modes is used to filter out higher-order modes, reducing the interference intensity between the fundamental mode and higher-order modes to effectively suppress mode instability effects and achieve high-power single-mode laser output.

This application provides a method and device for optical fiber anomaly detection, relating to the field of transmission technology. The method includes: acquiring the transmit power spectrum of the target optical fiber link under a reference state and the receive power spectrum monitored online; determining the abnormal insertion loss value based on the two total powers; employing a power evolution model that includes the stimulated Raman scattering effect between channels, evolving the transmit power spectrum forward to obtain a forward spectral tilt distribution, and evolving the receive power spectrum backward to obtain a reverse spectral tilt distribution; utilizing the matching characteristic of the forward and reverse spectral tilt distributions at the anomaly location, deriving a closed-form solution calculation formula for optical fiber anomalies to accurately determine the location of the anomaly. This application utilizes only the transmit and receive power spectra of existing transmission channels to achieve fast and accurate optical fiber anomaly localization and quantification through a closed-form solution, requiring no additional hardware, avoiding complex calculations and large-scale data training, and possessing advantages such as strong physical interpretability, good real-time performance, and suitability for low-cost distributed deployment.

The invention discloses a method for reducing the stimulated Raman scattering effect of liquid water and application of the method, and belongs to the technical field of water-guided laser processing. The method specifically comprises the following steps: adding potassium iodate into liquid water to obtain a potassium iodate aqueous solution; according to the invention, potassium iodate (KIO3) is added into liquid water, so that the stimulated Raman scattering effect of 532 nm green laser propagating in water can be greatly reduced, and the effect is better than that of pure water, KCl, NaCl and other substances. When the concentration of potassium iodate is 0.28 mol / L, the effect is optimal, and the stimulated Raman scattering energy can be reduced to about 30% of that of pure water. The solution is applied to a coupling water cavity of a water-guided laser instead of pure water, and stimulated Raman scattering of water can be reduced, so that the energy transmission efficiency is improved, the light beam quality is improved, the system stability is enhanced, the design difficulty is reduced, the processing efficiency and precision are guaranteed, and the solution has an important application prospect in the field of high-energy water-guided laser processing.

At least one sample parameter of a sample (16) is measured using measuring light. The measuring light is split into sample measuring light and reference measuring light. The sample measuring light interacts with the sample (16), generating modified measuring light with a phase and / or intensity dependent on the sample parameter. The modified measuring light and the reference measuring light overlap to interfere, generating signal light, and the intensity of the signal light is measured. A tuning parameter (t1, t2, t1', t2', t1'', ​​t2'') is determined from the intensity of the signal light and used to control a phase and / or intensity tuner (20, 32, 52, 70', 70'') to make the interference destructive and thus minimize or at least reduce the measured intensity. The sample parameter is determined based on the intensity parameter and / or the tuning parameter. This technique reduces shot noise.It can be used in a variety of applications, but a particularly preferred application is stimulated Raman scattering or NIR reflection / absorption spectroscopy.

The present application relates to the field of ultrafast laser technology, in particular to a fused quartz optical element ultraviolet laser damage suppression method and device, the method comprises: obtaining oxygen-18 modified DKDP crystal with oxygen-18 isotopic abundance higher than natural abundance; The oxygen-18 modified DKDP crystal is prepared into a wave plate matching the preset ultraviolet laser wavelength;In the ultraviolet laser path of the laser inertial confinement fusion device, the wave plate is arranged between the linear polarization state output end of the ultraviolet laser and the fused quartz optical element;The ultraviolet laser passes through the linear polarization state output end and the wave plate in turn, forms circularly polarized light and irradiates to the fused quartz optical element.The purpose is to actively suppress the small-scale self-focusing effect of fused quartz, solve the technical problem that the traditional material cannot be used as a large-aperture wave plate due to the excessively high transverse stimulated Raman scattering.

The invention relates to the technical field of optical fibers, in particular to a double-cladding single-mode strain optical fiber which comprises a fiber core, an inner cladding and an outer cladding, and a middle layer and a leakage layer are arranged between the inner cladding and the fiber core. The refractive index of the middle layer is lower than that of the fiber core, a refractive index barrier is formed, and a light field is limited from diffusing out of the fiber core; the refractive index of the leakage layer is equal to that of the fiber core, a leakage channel is provided for a high-order mode, the high-order mode cannot meet the total reflection condition due to the insufficient incident angle and can permeate into the leakage layer and be lost, only a fundamental mode (LP01) can be stably transmitted in the fiber core, and the phenomenon that when a laser and an amplifier carry out high-power laser output, the high-order mode is damaged is avoided. The invention solves the problem that the improvement of the laser power and the beam quality are limited due to the fact that the double-cladding single-mode strain optical fiber is easily influenced by nonlinear effects such as stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), meanwhile, the problem of multimode interference is avoided, and the improvement of the laser power and the beam quality in the double-cladding single-mode strain optical fiber and the high stability and low mode field distortion of single-mode transmission are ensured.

The present invention discloses a device and method for generating a high-power Raman structured optical field, where the pump light output by a pump source with a central wavelength of λ p is incident on a Raman resonator mounted on a two-dimensional movable platform after passing through a coupling system composed of a telescope system, a polarizer, a half-wave plate, and a focusing lens; in the resonator, the pump light with a central wavelength of λ p undergoes stimulated Raman scattering with a Raman crystal to generate Stokes signal light with a central wavelength of λ s . By adjusting the offset of the two-dimensional movable platform and the pitch and yaw angles of the output mirror, the optical field structure of the Stokes signal light is regulated, and a high-power Raman structured optical field with extended wavelength is output; the pump light is filtered out by a long-pass filter to obtain pure Stokes structured light. The present invention can enable the output optical field of a solid-state structured light laser to have a certain complex structure while extending the output wavelength of the structured light and solving the problem of power limitation.