94 results about "Stimulated raman" patented technology

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.

This invention provides a device and method for generating simultaneously emitted three wavelengths of laser light with equal spacing, relating to the field of laser technology. The device includes a pump source, a half-wave plate, an optical isolator, a focusing lens, an input mirror, a Raman crystal, an output mirror, a nonlinear crystal, and a dichroic mirror arranged sequentially along the optical path. The pump light, after its polarization direction is adjusted by the half-wave plate and the optical isolator, is focused onto the Raman crystal. Stimulated Raman scattering generates first and second Stokes beams, which are then converted to sum-frequency light by the sum-frequency effect of the nonlinear crystal. Finally, the dichroic mirror outputs three equally spaced wavelengths of laser light. This invention separates the Raman conversion and sum-frequency processes through an external cavity structure, achieving for the first time the simultaneous emission of three equally spaced wavelengths of laser light, offering advantages such as high output energy, equal wavelength spacing, and simultaneous emission of three wavelengths.

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

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 belongs to the field of laser frequency conversion, and particularly relates to a gas stimulated Raman frequency conversion device with a double-gas-chamber structure, wherein a pump laser source, a 45-degree mirror and a focusing lens are arranged outside a Raman cell A, two ends of the Raman cell A are respectively provided with a Raman cell window A and a Raman cell window C, the inside of the Raman cell A is provided with a Raman cell B, one end of the Raman cell B is connected with one end of the Raman cell A and shares the Raman cell window A, and the other end of the Raman cell B is provided with a Raman cell window B; one end of the Raman cell A in the length direction is provided with a plane mirror located below the Raman cell B, the other end of the Raman cell A in the length direction is provided with a concave mirror and a plane mirror, and the concave mirror and the plane mirror at the end are arranged in the up-down direction along the height direction of the Raman cell A.

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 relates to a double-droplet optical tweezers spontaneous / stimulated Raman spatial resolution measurement device and method based on a confocal system, belongs to the technical field of aerosol microdroplet spectrum trace analysis, and solves the problems that an existing aerosol double-droplet detection device generally depends on a traditional single-beam optical system, cannot capture double droplets, is insufficient in spatial resolution, cannot capture the double droplets, and cannot capture the double droplets. And high-precision spatial resolution is difficult to realize for capturing and dynamic monitoring of the double liquid drops. The device comprises a double-droplet suspension system, an environmental atmosphere control system, an optical path coupling system, a dynamic signal processing system, a droplet imaging system and a confocal optical system. The environment atmosphere control system is communicated with the double-droplet suspension system, and the confocal optical system is respectively communicated with the double-droplet suspension system, the dynamic signal processing system, the droplet imaging system and the light path coupling system; the confocal optical system comprises a microscope objective and a long-wave reflecting short-wave pass mirror, and the microscope objective is arranged between the long-wave reflecting short-wave pass mirror and the double-droplet suspension system.

The application discloses a kind of based on external cavity stimulated raman amplification laser radar light source, including continuous laser, laser pulse modulation module, first optical amplifier, optical coupling isolation module, pump light source, pump combiner.The application increases pump light source and pump combiner, so that the pulsed light source of laser radar atmospheric detection and the laser output by pump light source are co-propagating in the same path in atmosphere, can further amplify pulsed light source, improve signal-to-noise ratio, extend laser radar detection distance.The laser light source of the application is used for laser radar atmospheric detection, when transmitting in atmosphere, beam is not constrained by optical fiber, nonlinearity in atmosphere is very weak, the power of pump light source can be very large (up to hundreds of watts), and the output signal light signal is not affected by the nonlinearity of optical fiber transmission.

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 invention discloses an on-chip stimulated Raman photo-thermal gas sensing system and method, and particularly relates to the technical field of gas analysis and measurement. Pump light and Stokes light interact with gas to be detected in a sensing waveguide evanescent field area to excite gas molecules to generate a stimulated Raman process and generate local temperature rise through thermal relaxation, so that the refractive index change of the gas is caused, and probe light generates a phase modulation signal related to the refractive index change. Phase modulation signals and background phase disturbance related to the gas photothermal effect are distinguished and differentiated, so that phase background noise is suppressed, and the signal-to-noise ratio and sensitivity of gas measurement are improved. Functional units such as the laser, the sensing waveguide and the detector are integrated into a single chip to form a gas measurement system which is compact in structure, low in power consumption and high in anti-noise capability, and the problems of weak signal, high background noise and low integration level in traditional waveguide Raman gas measurement are effectively solved.

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.

The invention relates to a device for inhibiting the influence of a light polarization state on a stimulated Raman signal, which is characterized in that a passive depolarizer device is added to a pump light branch of a stimulated Raman gas detection system to reduce the degree of polarization of pump light, so that the influence of the light polarization state change caused by the light path state change on a stimulated Raman gain signal is reduced. According to the device for inhibiting the influence of the light polarization state on the stimulated Raman gain signal, a passive depolarizer device is constructed by adopting a passive optical device and a single-mode optical fiber, and the passive depolarizer device comprises a first polarization controller, a first polarization beam splitter, a single-mode delay optical fiber, a second polarization controller and a second polarization beam splitter. According to the invention, the environmental adaptability of the gas sensing system based on the stimulated Raman effect in a real measurement scene is improved, and the practicability of the gas sensor is accelerated. The polarization degree of the pump light is reduced, meanwhile, the system cost is not obviously increased, and compared with an optical fiber scrambler and a passive depolarizer achieved through polarization maintaining optical fibers, the passive depolarizer has the obvious cost advantage.

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.

This invention discloses a photoacoustic stimulated Raman gas detection system and method based on hollow-core optical fiber seed injection enhancement, belonging to the field of laser spectroscopy trace gas detection technology. The system includes a light source and beam splitting module, a hollow-core optical fiber seed generation module, an optical delay module, and a short-path power amplification module. The main laser beam is incident on a beam splitter and splits into a first beam and a strong pump beam. In the hollow-core optical fiber seed generation module, the first beam is reflected by a fifth mirror, a hollow-core optical fiber seed generation unit, a sixth mirror, and a filter, outputting a weak seed beam. The strong pump beam enters the optical delay module and synchronizes with the weak seed beam output from the filter. In the short-path power amplification module, the weak seed beam and the strong pump beam output from the optical delay module are combined and strictly coaxial at a dichroic mirror, then focused by a convex lens and enter the short-path Raman frequency shifter. This invention achieves a significant reduction in the oscillation threshold of the Raman frequency shifter by utilizing seed light-induced stimulated emission.

A narrow-linewidth internal cavity Raman laser, belonging to the field of Raman lasers, is disclosed to address the problems existing in current Raman lasers. The invention includes a laser emitting section, an SRS effect cavity, a beam splitter, a pump beam splitter, and a Stokes beam splitter. The laser emitting section emits a first optical signal with a tunable first preset power and a first preset wavelength into the SRS effect cavity. The first optical signal is amplified in the SRS effect cavity to generate a second optical signal, wherein the first and second optical signals are pump lights with different powers and wavelengths. In the SRS effect cavity, the second optical signal is converted into Stokes light using stimulated Raman oscillation, leaving a portion of unconverted pump light. The Stokes light and the unconverted pump light are separated by the beam splitter, causing the Stokes light to oscillate in the seed beam oscillation cavity and the residual pump light from the stimulated Raman effect to oscillate in the pump beam oscillation cavity, thereby outputting a narrow-linewidth laser.

The invention relates to a device and a method for realizing spontaneous / stimulated Raman high-spatial-resolution observation of suspension droplets by using aerosol optical tweezers, belongs to the technical field of optical capture and particle detection, and solves the problem that the existing aerosol optical tweezers are difficult to realize high-spatial-resolution observation of the droplets. The device comprises an imaging aiming module and a signal acquisition module located at the downstream of the imaging aiming module. The imaging aiming module comprises a rotary console and a translation console; and the signal acquisition module comprises an optical filter, a spectrograph and an imaging CCD (Charge Coupled Device).

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 embodiment of the invention provides a Raman amplifier gain adjustment method which comprises the following steps: adjusting DRA-P pumping configuration according to a first preset adjustment target, and determining a third preset adjustment target of a preset virtual intermediate point position according to amplifier performance parameters of a receiving end and a second preset adjustment target of a receiving end OSNR, and adjusting the transmitting terminal configuration of the transmitting terminal according to a third preset adjustment target, detecting the actual OSNR of the receiving terminal, and when the actual OSNR does not meet a second preset adjustment target, circularly and finely tuning the DRA-P pumping configuration and / or the transmitting terminal configuration until the actual OSNR meets the second preset adjustment target. According to the embodiment of the invention, segmented decoupling is carried out on the C + L system, and the gain of the amplifier is adjusted and optimized according to the sequence of the receiving end, the transmitting end and the whole, so that the problem that in the prior art, the stimulated Raman scattering effect exists between the pumping wavelengths of the Raman amplifier in the C + L system and between the service light of the C wave band and the service light of the L wave band can be solved; and the overall optical signal-to-noise ratio performance of the C + L system is influenced.

A stimulated Raman photothermal (SRP) microscope for imaging a sample. A first optical source without an optical resonator emits a pump beam. A second optical source emits an intensity-modulated Stokes beam. The Stokes beam is combined with the pump beam to form a combined beam. The combined beam is directed to the sample to induce a thermal effect caused by the stimulated Raman process. A third optical source emits a probe beam, the probe beam is directed to the sample. An optical detector detects modulation of the probe beam after modulation by the sample to measure an SRP signal. Because noise in the pump and Stokes beam do not significantly effect the measurements from the probe beam, these beams can use a high-powered optical parametric amplifier (OPA) source for improved sensitivity and imaging speed compared to SRP microscopes using an optical parametric oscillator (OPO) source.

The invention relates to the technical field of cold atoms, in particular to a multi-mode switching stimulated Raman transition laser system and a use method thereof. The system comprises a master laser, a slave laser and a plurality of switches arranged on the propagation path of the master laser and the propagation path of the slave laser respectively. Master laser emitted by the master laser is divided into first master laser and second master laser, and slave laser emitted by the slave laser is divided into first slave laser and second slave laser; the first master laser and the first slave laser are selectively transmitted to the first beam combining element under the control of the corresponding optical switches, and the second master laser and the second slave laser are selectively transmitted to the second beam combining element under the control of the corresponding optical switches. According to the invention, the on-off state of the optical switch is subjected to combined control, so that one machine has multiple functions without changing the core structure of an optical path, the adaptability and application flexibility of the system in a scene in which the configuration of an optical field needs to be frequently switched are improved, and the complexity and the cost of repeated construction of a plurality of sets of systems are avoided.

The invention relates to the technical field of ultrafast laser, and discloses a pumping intensity optimization method of a laser, equipment and a medium. The method comprises the following steps: carrying out graded pumping design, and pre-amplifying signal light output by a mode-locked fiber oscillator by adopting a single-mode laser diode; the method comprises the following steps: establishing a mathematical model of pumping power and gain fiber length, and when the pumping power is increased from low power to preset power, adjusting the chirp amount of a chirp fiber grating through a temperature tuning device, and performing pre-chirp management on signal light input into a multimode gain fiber; under high pumping intensity, the initial chirp amount of signal light is optimized, so that the signal light entering the multimode gain optical fiber is in a negative chirped pulse state, the self-phase modulation and dispersion effect of the signal light when the signal light is amplified in the multimode gain optical fiber is balanced, and the stimulated Raman scattering and self-focusing phenomena are avoided; and the compressed pulse width is used as a feedback signal to realize the optimal matching of the signal light energy and the pulse width.

The utility model provides an output isolator with a Raman suppression function, which comprises a shell, an isolation module is packaged in the shell, one end of the isolation module is provided with an input optical fiber, and the input optical fiber extends out of the shell; the input optical fiber is provided with a fiber core and a wrapping layer wrapping the fiber core, a Raman suppression grating used for suppressing stimulated Raman scattering light is arranged on one section of the fiber core, an included angle which is not zero is formed between the Raman suppression grating and the axial direction of the fiber core, and the Raman suppression grating is not perpendicular to the axial direction of the fiber core. According to the utility model, the number of welding points of an optical fiber system can be reduced, system complexity is reduced, and optical signal transmission quality is improved.