16 results about "Stimulated raman" patented technology

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 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.

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.

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.

This invention provides a U-band high-energy square-wave pulsed Raman light source module. It first achieves initial stable amplification of the seed light through forward pumping with a 100-watt pump source, followed by high-energy main amplification through reverse pumping with a kilowatt-level pump source. Both stages of Raman amplification utilize highly nonlinear optical fibers as the gain medium to significantly enhance the stimulated Raman scattering effect, efficiently converting pump light energy into signal light and improving overall Raman gain and energy conversion efficiency. Simultaneously, it balances the stability of the amplification process with the integrity of the pulse waveform, thereby achieving a smooth, step-by-step amplification of the U-band pulsed seed light. Ultimately, it stably outputs high-energy U-band square-wave pulsed light with a single pulse energy ≥5μJ and a pulse width of 80–120ns, significantly improving the light source's output performance and better meeting the application requirements of long-distance fiber optic communication expansion and atmospheric methane remote sensing.

An all-fiber laser system includes a gain fiber and a fiber-based optical coupling structure configured to introduce pump light into a signal fiber. The optical coupling structure provides intrinsic isolation of pump fibers from backward-propagating optical radiation generated in the gain fiber, including backward-propagating signal light and stimulated Raman scattering (SRS) light. By structurally suppressing coupling of the backward-propagating optical radiation into the pump fibers, the laser system mitigates population inversion collapse and suppresses laser instability and self-pulsation induced by optical back reflection during processing of reflective materials. The system enables stable continuous operation at multi-kilowatt output power without reliance on free-space optical isolators, circulators, or active shutdown mechanisms, thereby improving reliability of pump light sources and protecting an output fiber during high-power laser operation.

The application belongs to the field of Raman laser, and particularly relates to a high-repetition-frequency high-energy pulsed Raman laser with backward scattering output, which comprises a dichroic mirror, a Raman cell A, a 45-degree reflecting mirror, a plano-convex lens and a Raman cell B arranged in sequence along the direction of laser emission of a pumping laser; the laser passes through the dichroic mirror, the Raman cell A, the 45-degree reflecting mirror, the plano-convex lens and the Raman cell B in sequence, wherein the first-order Raman laser is generated in the Raman cell B, the forward transmission Raman laser is absorbed by the inner wall of the Raman cell B, the backward transmission Raman laser returns to the Raman cell A as seed light, and the laser entering the Raman cell A is amplified and then the backward first-order Stokes Raman light is finally emitted vertically through the dichroic mirror. The application uses the backward stimulated Raman scattering light as seed light to generate Raman laser after amplification, has low requirement on the laminar flow of Raman medium, good Raman beam quality and relatively simple structure.

This invention discloses a super-resolution stimulated Raman scattering imaging method for drug distribution detection, comprising the following steps: The laser output from a laser is frequency-doubled and spatially shaped to generate three laser beams, one used as a Stokes beam, one as a pump beam, and one as a saturation beam; the Stokes beam and the pump beam are spatially collinear; the three beams are temporally coupled; the beams are connected to the scanning section of a microscope system; a digital acquisition card acquires signals, obtaining the modulation response of the pump beam to the Stokes beam, thereby monitoring drug distribution. This invention also discloses the application of this super-resolution stimulated Raman scattering imaging method for drug distribution detection in the cellular targeting and intracellular distribution of drugs in the nervous system. By controlling the spatial distribution of the laser, this invention enables a portion of molecules within the focal point to be in an electron absorption saturation state, which can suppress the pump detection signal and break the diffraction limit of non-fluorescent substances in far-field imaging.

The present invention proposes a photothermal microscopy system (1) for analysing a sample, comprising a pulse light source system (10) configured for providing a first train of optical pulses (B1) at first optical center wavelengths (λ1) and a second train of optical pulses (B2) at second optical center wavelengths (λ2) in a burst mode, wherein the microscopy system is a stimulated Raman photothermal microscopy system with a Stokes beam and a pump beam. A probe light source (30) provides a probe beam (P) at a third wavelength (λ3), the third wavelength different from the first and second wavelengths. The system comprises focusing optics (40) configured to direct the first train of optical pulses (B1), the second train of optical pulses (B2) and the probe beam (P) to a sample in a focal volume (5), an optical detector (60) configured to detect a transmitted or reflected probe beam (P1) after interaction in the sample in the focal volume, and a processor (80) configured to process signal components from the detected transmitted or reflected probe beam (P1) and to output a signal or a pixel representative of the interaction in the sample.

This invention discloses a mid-infrared narrow-linewidth fiber laser based on microsphere feedback and a method for laser output, relating to the field of mid-infrared laser technology. The mid-infrared narrow-linewidth fiber laser includes Er... 3+ / Yb 3+ Co-doped low-hydroxyl fluorotellurate glass optical fiber, pump light source, multilayer dielectric film and passive fluorotellurate glass microspheres, Er 3+ / Yb 3+ The co-doped low-hydroxyl fluorotellurate glass fiber has a tapered region, and passive fluorotellurate glass microspheres achieve wavelength-selective feedback of the whispering-gallery mode through evanescent field coupling. This invention can output a narrow linewidth laser of 2.7 μm, which is extended to the 3-5 μm band through stimulated Raman scattering. This invention has advantages such as narrow linewidth, high stability, precise coupling, and good integration, and is suitable for applications such as environmental monitoring, biomedicine, and high-precision spectroscopic detection.

This invention relates to a device and method for spontaneous / stimulated Raman spatial resolution measurement of dual-droplet optical tweezers based on a confocal system, belonging to the field of aerosol microdroplet spectral trace analysis technology. It solves the problem that existing aerosol dual-droplet detection devices typically rely on traditional single-beam optical systems, which cannot capture dual droplets and have insufficient spatial resolution, making it difficult to achieve high-precision spatial resolution for dual-droplet capture and dynamic monitoring. The device of this invention includes a dual-droplet suspension system, an environmental atmosphere control system, an optical path coupling system, a dynamic signal processing system, a microdroplet imaging system, and a confocal optical system. The environmental atmosphere control system is connected to the dual-droplet suspension system, and the confocal optical system is connected to the dual-droplet suspension system, the dynamic signal processing system, the microdroplet imaging system, and the optical path coupling system. The confocal optical system includes a microscope objective and a long-wavelength reverse short-wavelength lens, with the microscope objective positioned between the long-wavelength reverse short-wavelength lens and the dual-droplet suspension system.

This invention relates to the field of marine environmental monitoring technology and discloses a marine water microplastic particle monitoring system and method. The method includes: acquiring a three-mode synchronous signal data stream; generating an event window marker sequence based on forward scattering pulse analysis; performing sparse deconvolution separation on photoacoustic signals within multiple overlapping event windows; extracting particle physical parameters; using the particle number as a hard constraint for the number of components and the volume percentage weight vector converted as an abundance coefficient constraint, performing constrained nonnegative matrix factorization on the overlapping stimulated Raman spectra; performing reconstruction verification; merging the identification results and calculating the concentration.

A method for the determination of antibiotic susceptibility through stimulated Raman scattering microscopy is disclosed. The method utilizes a imaging apparatus adapted to collect a laser signal through a sample having a bacteria for imaging the metabolism of the sample. The sample can be manipulated with an antibiotic for imaging to determine the susceptibility of a bacteria to the provided antibiotic.

The application provides a mid-infrared laser based on hydrogen Raman laser and optical parametric oscillation, comprising a Nd:YAG laser, a hydrogen stimulated Raman cell and an optical parametric oscillator, wherein the Nd:YAG laser emits circularly polarized laser, the circularly polarized laser enters the hydrogen stimulated Raman cell, and multi-wavelength laser is generated through a stimulated Raman process; and specific wavelength laser in the multi-wavelength laser excites the optical parametric oscillator to generate mid-infrared laser. In the application, 1064nm circularly polarized laser generates 2.1mu m laser through hydrogen stimulated Raman, and the 2.1mu m laser pumps ZGP OPO to generate 3-5mu m infrared laser. The working principle of the laser of the application is simple, and compared with the scheme of Tm:YLF, Ho:YAG and OPO emitting light in turn, the complexity is significantly reduced, and the advantages of the stable and reliable Nd:YAG laser are fully utilized.

The present application belongs to the technical field of biomedical imaging, and particularly relates to a transparent reagent for stimulated Raman scattering imaging and a preparation method and application thereof. The reagent components include 20-60% urea by mass percentage, 0.5-5% cyclodextrin compounds by mass percentage, and the rest is deuterated dimethyl sulfoxide; and the reagent is obtained by ultrasonic mixing and filtering of microparticles. The reagent can realize rapid transparentization of a millimeter-thick tissue sample in a short time by introducing a temperature regulation and a cyclodextrin-mediated cholesterol depletion mechanism, and significantly improves the transparentization efficiency, thereby significantly improving the imaging depth and contrast of the stimulated Raman scattering microscope, and realizing label-free and real-time three-dimensional histological imaging. The present application not only breaks through the limitation of traditional transparentization relying on lipid removal leading to loss of lipid signal in stimulated Raman imaging, but also solves the technical problem of lack of suitable transparentization scheme for stimulated Raman scattering imaging in large-volume tissues.