133 results about "Raman laser" patented technology

The invention provides a Raman-meter signal all-day laser radar ratio inversion method and device, and the method comprises the steps: carrying out the denoising of signal data of a Raman laser radar in a preset time period, and carrying out the inversion, and obtaining a first aerosol backscattering coefficient profile; applying a plurality of preset laser radar ratios to the inversion of the meter laser radar signal at the same moment to obtain a plurality of second aerosol backscattering coefficient profiles; taking the first aerosol backscattering coefficient profiles at the same moment as a reference standard, calculating a relative error average value of each second aerosol backscattering coefficient profile, and obtaining an optimal laser radar ratio corresponding to the minimum relative error average value; fitting the optimal laser radar ratio with the mean value of the aerosol depolarization ratio of the meter laser radar below the boundary layer height at the corresponding moment to obtain a relation curve; and substituting the mean value of the aerosol depolarization ratio at the current moment into the relation curve to obtain the laser radar ratio. According to the invention, the inversion precision of the aerosol laser radar ratio is improved.

The invention relates to a terahertz-Raman integrated detection system and method. The detection system comprises a fusion mainframe box and an integrated probe arranged at a sample detection end on the fusion mainframe box, a Raman spectrum module, a terahertz spectrum module, a terahertz optical module and a data analysis module are arranged in the fusion mainframe box; the Raman spectrum module is composed of a Raman laser, a Raman light filter, a Raman grating and a Raman detector which are sequentially connected through a light path; the terahertz spectrum module is composed of a terahertz femtosecond laser, a transmitting photoconductive antenna, a receiving photoconductive antenna and a terahertz detector which are sequentially connected through a light path; the data analysis module is in communication connection with the Raman detector and the terahertz detector and is used for synchronously processing data transmitted by the Raman detector and the terahertz detector. Compared with the prior art, the integrated probe synchronously collects two kinds of spectral data and carries out fusion processing on the two kinds of spectral data through the data analysis module, and the device has the remarkable effects that the device integration degree is high, the detection efficiency and accuracy are greatly improved, and the application range is wide.

The invention discloses a method for measuring a detection inclination angle of a two-component atomic shearing interferometer. The method comprises the following steps: constructing an inclination angle set of an angle swinging device; when the atoms are acted by the pi Raman laser and the second pi / 2 Raman laser, the reflecting mirror rotates by an angle; alternately detecting multiple groups of odd-numbered groups and even-numbered groups; traversing all dip angles in the dip angle set; and fitting and calculating the actual included angle of the longitudinal direction of the imaging surface of the CCD camera relative to the Z-axis direction. The invention further discloses a measuring device for the detection inclination angle of the two-component atom shearing interferometer. According to the method, an existing atom shearing interferometer can accurately measure the inclination angle of a detection system of the atom shearing interferometer, so that the problems of noise and system errors caused by the fact that the inclination angle of the detection system of the atom shearing interferometer does not return to zero are solved, and drifting of differential measurement of the two-component atom interferometer caused by inclination angle changes is restrained.

The invention relates to the technical field of spectral imaging detection, in particular to a spontaneous-stimulated Raman co-localization single-cell substructure atlas analysis system and a spontaneous-stimulated Raman co-localization single-cell substructure atlas analysis method. The system comprises a femtosecond pulse excitation module used for outputting two beams of broadband femtosecond pulse laser with different frequencies and continuously adjustable optical power; the Stokes light modulation module is used for modulating the Stokes light and carrying out space beam combination on the Stokes light and the pump light; the pump light modulation module is used for modulating pump light; the spontaneous Raman laser continuous adjusting module is used for outputting spontaneous Raman laser; the stimulated Raman exciting light co-positioning module is used for combining the combined laser and the spontaneous Raman laser again, focusing the combined laser and the spontaneous Raman laser on a sample, exciting a stimulated Raman scattering signal, converting the stimulated Raman scattering signal into a digital signal and carrying out data acquisition; and the spectrum detection module is used for collecting the spontaneous Raman scattering light which is reflected and returned along the original light path, and collecting a spectrum signal to form a Raman spectrum. The method has the advantage of improving the accuracy of single-cell heterogeneity structure and cancer cell type discrimination.

Various optical systems for use in a light pulse atomic interferometer (LPAI)-based one-, two-, or three-axis accelerometer or gyroscope are disclosed. As an LPAI accelerometer or gyroscope may employ many different laser beams to implement the LPAI functionality, ways of combining these different laser beams to thereby simplify the optical systems are desired. The cooling laser beam portion of the optical system may be simplified using one or more reflective grating chips. The Raman laser beam optics may be simplified using combiners and separators. For LPAI systems sensing along three axes, various optical switching schemes may be employed, including ones that generate variable data-rates with a primary sensing axis having a higher data-rate than the secondary sensing axes. Further, by combining various laser beams in a time-multiplexed manner, the number of optical fiber tethers to a sensor head may be reduced.

The invention discloses a flow-type Raman sorting method and a high-luminous-flux flow-type Raman sorting device, and the method comprises the following steps: carrying out coincident focusing on Raman laser and near-infrared laser captured by a light trap to form a Raman excitation detection site, and arranging the Raman excitation detection site at the tip of the outer end of a tail end electrode in a chip dielectric focusing electrode; the photo-thermal oscillation near-infrared laser is focused on a tail end electrode in a dielectric focusing electrode of the chip and does not coincide with a Raman excitation detection site; through switching of light trap capture near-infrared laser and photo-thermal oscillation near-infrared laser, a single cell sample is captured and fixed at a Raman excitation detection site through light trap capture force generated by the light trap capture near-infrared laser or bubbles are generated through a photo-thermal effect generated by the photo-thermal oscillation near-infrared laser; the cell sample adhered to the tail end electrode in the dielectric focusing electrode is oscillated and separated through the bubbles. Compared with the prior art, the device has the beneficial effects that the organic combination of optical trap capture and dielectric capture sample oscillation functions can be realized, the switching is convenient, flexible, rapid, simple and reliable in use, the instrument cost is greatly reduced, the application range of the instrument is effectively widened, and the device has very strong universality.

The invention provides a tip Raman-based metal oxide nanoparticle in-situ detection method, which comprises: S1, dispersing metal oxide nanoparticles in a nanoparticle dispersion liquid, focusing laser to the tip of a nanometer tip through an objective lens, capturing a single nanoparticle by using an optical tweezers technology, and attaching the single nanoparticle to the nanometer tip; s2, focusing Raman laser on a nano needle tip-particle interface, generating a local high-temperature field through a photo-thermal near-field coupling effect, triggering a thermal chemical reaction of nano particles, and synchronously collecting a Raman spectrum; and S3, carrying out pretreatment and characteristic peak analysis on the collected Raman signal of the Raman spectrum, and determining the reaction critical temperature and the dynamic process in combination with temperature calibration data. According to the invention, capture and accurate heating of the nanoparticles are realized through photo-thermal coupling of the optical tweezers and the needle tip, and thermal chemical reaction monitoring of the nanoparticles is realized.

The invention provides a holmium and ytterbium co-doped mid-infrared microsphere Raman laser and a preparation method thereof, and relates to the technical field of laser preparation, the holmium and ytterbium co-doped mid-infrared microsphere Raman laser comprises an infrared transmission optical fiber, a pump light source, holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres, pump light emitted by the pump light source is guided to a conical region through the infrared transmission optical fiber, and the holmium and ytterbium co-doped tellurate glass microspheres and the passive tellurate glass microspheres are arranged in the conical region; sequentially carrying out optical coupling with holmium and ytterbium co-doped tellurate glass microspheres and passive tellurate glass microspheres; in the holmium and ytterbium co-doped tellurate glass microspheres, the doping amount of the holmium element is 0.3%, and the doping amount of the ytterbium element is 0.45% according to the mass percentage. Compared with the prior art, through the cascade structure of the holmium-ytterbium co-doped microspheres and the passive microspheres, three-step wavelength conversion of pump light-rare earth ion lasing-Raman frequency shift is realized in a single system for the first time, and the wavelength limitation that a traditional single microsphere depends on a rare earth ion fixed energy level is broken through.

The invention discloses a cold atom interference type low-frequency vibration measurement device and a measurement method, and solves the problems that the existing cold atom interference gravimeter measurement equipment is limited by the performance of a vibration sensor, the compensation precision is insufficient, timing calibration is needed, and the measurement precision is low. And measurement errors generated by gravity and ultralow-frequency vibration cannot be effectively separated from a measurement result of the cold atom interference gravimeter, namely, decoupling of two measurement parameters is realized, and cold atom interference measurement of low-frequency vibration is realized. The measuring device comprises a Raman laser output system, a vacuum cavity, a sensitive axis converter and a vibration detection reflecting mirror, the Raman laser output system outputs two pieces of Raman laser which have the same polarization state and are both circular polarization states; the low-frequency vibration is transmitted to the liquid crystal phase modulator through the vacuum cavity for polarization state conversion, and then is reflected to the liquid crystal phase modulator or the vibration detection reflector through the polarization splitting prism, so that the interference type low-frequency vibration of the cold atoms is measured, and decoupling of the two is realized.

The invention provides a system and a method for fast focusing in combination with Raman laser spots, and belongs to the technical field of optical imaging, the system comprises a spectrum excitation light path, a spectrum receiving light path, an imaging light path and a control system; the spectrum excitation light path, the spectrum receiving light path and the imaging light path jointly form a Raman focusing light path; through fitting calibration preparation of the optimal focal plane, judgment basis of the aggregation fitting process, setting of the aggregation fitting process and starting of the automatic focusing process, rapid focusing is realized, aggregation calculation can be carried out only by reading the laser spot image at the current position, the automatic focusing efficiency is greatly improved, and the automatic focusing precision is improved. The method is of great significance to various applications needing Raman splicing and Mapping, and the overall technical scheme is scientific and reliable in design and suitable for application and popularization.

The invention discloses an optical time domain reflectometer based on ring structure modulation and a working method thereof, and relates to the technical field of optics. The optical time domain reflectometer comprises a laser, an optical fiber coupler, a semiconductor optical amplifier, an acoustic optical modulator, an optical isolator, a delay optical fiber, an erbium-doped optical fiber amplifier, a dense wavelength division multiplexer, a circulator, a Raman laser, piezoelectric ceramics, an arbitrary function generator, an arbitrary waveform generator, a polarization controller, a photoelectric balance detector, a data acquisition card, a computer and the like. Multi-frequency modulation is carried out based on an annular structure, the multi-frequency modulation range is only limited by the bandwidth of a detector and the sampling rate of an acquisition card, a pulse sequence is generated through modulation of the optical annular structure, dependence on the bandwidth performance of a microwave signal source and a modulator is reduced, and the bandwidth is improved; and by injecting the Raman light, the sensing distance is also increased, the equipment cost is effectively controlled, and meanwhile, a new scheme is provided for time sequence pulse sequence modulation.

The present invention relates to a method for separating and enriching a chlorine-37 isotope using a laser photochemical reaction and, specifically, to a method for separating and enriching a high-purity chlorine-37 isotope, which is essential for a next-generation molten chloride fast reactor (MCFR) and the like, by selectively photolyzing specific isotopic molecules of iodine monochloride (ICl) using a high-power fiber laser or a solid-state Raman laser and reacting same with a radical scavenger to effectively terminate a chain reaction. Accordingly, by employing, as a light source, a single-frequency fiber laser or a solid-state Raman laser that has higher power efficiency and easier maintenance than conventional dye lasers and is capable of achieving high power of several kW or more through modular expansion, mass production on an industrial scale can be realized and the economic feasibility of the process can be significantly secured.

The invention may be embodied in other forms than those specifically disclosed herein without departing from itMulti-kW-class blue (400-495 nm) fiber-delivered lasers and module configurations. In embodiments, the lasers propagate laser beams having beam parameter products of <5 mm*mrad, which are used in materials processing, welding and pumping a Raman laser. In an embodiment the laser system is an integration of fiber-coupled modules, which are in turn made up of submodules. An embodiment has sub-modules having a plurality of lensed blue semiconductor gain chips with low reflectivity front facets. These are locked in wavelength with a wavelength spread of <1 nm by using volume Bragg gratings in an external cavity configuration. An embodiment has modules having of a plurality of submodules, which are combined through wavelength multiplexing with a bandwidth of <10 nm, followed by polarization beam combining. The output of each module is fiber-coupled into a low NA fiber. In an embodiment a kW-level blue laser system is realized by fiber bundling and combining multiple modules into a single output fiber.

The invention relates to the technical field of in-situ Raman monitoring microwave plasma chemical vapor deposition devices, and particularly discloses diamond growth in-situ Raman test equipment and a Raman test method, the Raman test equipment comprises a growth device and a Raman laser test device; a detection window is arranged on an upper cover of a reaction chamber of the growth device, and a Raman laser testing device with a height adjusting mechanism, an angle adjusting mechanism and a distance measuring adjusting mechanism is arranged on the outer side of the detection window. The three mechanisms cooperate to accurately focus a laser beam on a diamond wafer edge strongest signal area on a deposition table at an optimal incident angle and an optimal working distance; according to the method, in the process of growing the diamond through microwave plasma chemical vapor deposition, Raman spectrums are collected and analyzed in real time, and technological parameters are dynamically fed back and optimized. And finally, high signal-to-noise ratio, in-situ and real-time monitoring and accurate control of the diamond growth process in a high-temperature plasma environment are realized.

The invention relates to a solid Raman laser with an adjustable polarization state and a working method thereof, and belongs to the technical field of lasers. The laser comprises an LD pumping source, a fundamental frequency light input mirror, a laser working substance, a Q-switched working substance, a fundamental frequency light output mirror, a Raman cavity input mirror, an a-cut anisotropic Raman crystal, a Raman cavity output mirror, a beam splitter, a polaroid and a power meter which are sequentially arranged along a light path, and an oscilloscope is arranged on one side of the beam splitter. By accurately controlling the orientation of the anisotropic Raman crystal, the elliptical polarization passive Q-switched Raman laser can be switched among different polarization states, and has the advantages of compact structure, easiness in integration and controllable Raman light polarization state.

The application belongs to the technical field of spectral detection, and specifically discloses a kind of characterization methods of fuel cell membrane electrode interface working condition Raman signal, comprising the following steps: constructing fuel cell suitable for Raman test, preparing membrane electrode, assembling fuel cell, assembling in-situ Raman spectrum detection device, detecting fuel cell membrane electrode Raman signal.The application constructs fuel cell window piece, and makes laser passage by constructing window piece, optimizes flow field plate structure and material, avoids the problem that Raman laser cannot be focused due to too large distance from window piece to membrane electrode and the problem that operation platform is unstable due to too heavy weight of fuel cell, and can detect membrane electrode spectral information;The application can be applied to signal detection in different electrocatalytic reaction processes of membrane electrode cathode and anode, thereby providing guidance for the design of electrocatalyst.

The application discloses a method for measuring a detection tilt angle of a two-component atomic shearing interferometer, constructs a tilt angle set of a swing angle device; the angle of a mirror is turned between the time when atoms are subjected to the action of a pi Raman laser and a second pi / 2 Raman laser; a plurality of groups of odd number and even number are alternately detected; all tilt angles in the tilt angle set are traversed; and the actual included angle of the longitudinal direction of a CCD camera imaging surface relative to the Z-axis direction is calculated by fitting. The application also discloses a measuring device for the detection tilt angle of the two-component atomic shearing interferometer. The application enables the current atomic shearing interferometer to accurately measure the tilt angle of the detection system, thereby solving the problems of noise and system error caused by the non-zero return of the tilt angle of the detection system of the atomic shearing interferometer, and suppressing the drift of the differential measurement of the two-component atomic interferometer caused by the change of the tilt angle.

The invention discloses a Raman beam combination laser amplifier, relates to the technical field of laser, and aims to solve the problem of low conversion efficiency of an existing beam combination laser amplifier. A first bowl-shaped reflecting mirror and a second bowl-shaped reflecting mirror are coaxially arranged at the two ends of a columnar reflecting mirror assembly, the concave surfaces face the columnar reflecting mirror assembly, and a Raman laser crystal is arranged in the columnar reflecting mirror assembly; seed light output by the seed light module enters the Raman laser crystal through the center of the first bowl-shaped reflector; and a plurality of beams of fundamental frequency light output by the plurality of fundamental frequency light modules are obliquely incident to the Raman laser crystal from the side surface of the columnar reflector assembly. Each beam of fundamental frequency light of the Raman beam combination laser amplifier can be reflected for multiple times in the amplifier and interacts with the seed light for multiple times, the conversion efficiency of the single beam of fundamental frequency light is improved, the adjustment difficulty of the fundamental frequency light module is low, and the Raman beam combination laser amplifier is suitable for integrated use.

The application discloses a high-power single-mode linear polarization Raman fiber laser based on a multimode optical fiber, and is characterized in that: a Raman gain medium of the laser is a single-clad circularly symmetric step-index distribution large-core multimode optical fiber; a base mode diameter of the step-index large-core multimode optical fiber is more than 65% of a core diameter; a Bragg fiber grating is inscribed in the core of the multimode optical fiber by using a femtosecond laser direct writing technology; a long axis of the grating region is coincided with a base mode field supported by the multimode optical fiber in a radial direction in space and length; the grating forms selective optical feedback only to the base mode in the cavity; a grating region with a difference between the long axis and the short axis forms selective feedback to one polarization state of the base mode; thus, the multimode optical fiber Raman laser effectively suppresses generation of mode instability at a high power level through active mode cleaning, and finally realizes near-diffraction-limited single-mode, high linear polarization and high-power Raman fiber laser output.

The embodiment of the invention discloses a Raman sampling device, which comprises a Raman laser used for outputting a first parallel light beam; the negative lens unit is used for diverging the first parallel light beam output by the Raman laser; the positive lens unit is used for converging the diverged first parallel light beams and integrating the diverged first parallel light beams into second parallel light beams; and the included angle between the axis of the light guide rod and the second parallel light beam is smaller than or equal to 5 degrees, so that the second parallel light beam is reflected in the light guide rod for more than 5 times. The Raman sampling device disclosed by the invention has the beneficial effects that the Raman sampling device realizes uniform distribution of exciting light of large light spots through the beam expanding and light uniformizing structure; a multi-point optical fiber collection structure is adopted, so that the scattered light collection efficiency is improved, and the detection repeatability and representativeness are ensured; the combination of the annular multiple optical fibers and the diffusion film is adopted at the receiving end, the multi-angle collection capacity of Raman scattering light is improved, the Raman sampling device is suitable for rapid detection of heterogeneous samples, and the problem of poor spectrum reproducibility is solved.

The present invention discloses a wavelength-tunable Raman fiber laser based on gain control, comprising a second feedback component, a second coupling component, a gain component, a first coupling component, an output component, and a first feedback component, which are sequentially connected to form a linear cavity structure, and further comprising a second excitation component and a first excitation component. The light output by the first excitation component and the second excitation component has different central wavelengths. The present invention has a simple structure, wherein two pump lights of different central wavelengths are selected, each of which is power-amplified by an amplifying component and then coupled into a Raman gain fiber, i.e., a gain component. After the two Raman net gain spectra are superimposed on each other, Raman laser light can be emitted at the point of highest gain in the resonant cavity. Compared with traditional tunable Raman fiber lasers, there is no need for costly wavelength-tunable pump sources and tunable filters, and the resonant cavity structure is simple and compact with low loss.

The invention discloses a complete common mode rejection two-component atom interferometer which comprises a vacuum system, detection laser, second Raman laser, third Raman laser and compensation light are arranged above the top of the vacuum system, and a reflector is arranged below the bottom of the vacuum system. The first Raman laser and the fourth Raman laser are reflected by the reflecting mirror, are incident to the vacuum system from the bottom of the vacuum system, and are propagated upwards along the extension direction parallel to the central axis of the vacuum system; by setting Raman laser of a prime specific frequency relation, a light intensity proportional relation and a spatial position relation corresponding to a first component and a second component of a cold atomic group in a vacuum system, the two-component atom interferometer can realize complete suppression of common-mode noise during differential measurement. According to the invention, the technical bottleneck problem that the measurement precision is limited due to the fact that the noise of the internal-state controllable two-component atom interferometer cannot completely suppress the common mode is solved.

The invention relates to a double-path beam-combining Raman laser power time-sharing locking device and method, an acousto-optic modulator is used for dividing an optical signal emitted by a laser into a first optical path and a second optical path, a first power modulator and a first diaphragm are sequentially arranged along the first optical path, a second power modulator and a second diaphragm are sequentially arranged along the second optical path, and the acousto-optic modulator and the second diaphragm are sequentially arranged along the second optical path. The first light path and the second light path are intersected on the light combination prism, and the power detection assembly is arranged on an output light path of the light combination prism; the first diaphragm and the second diaphragm are alternately opened according to a preset time sequence, power monitoring is performed on the first optical path or the second optical path through the power detection assembly, and feedback adjustment of optical power is performed on the first optical path through the first power modulator according to a monitoring result. And according to the monitoring result, feedback adjustment of the optical power is carried out on the second optical path through a second power modulator, so that power locking of the first optical path and the second optical path is realized in a preset error range.

The application provides a solid-liquid system preparation and interface thermal resistance measurement method based on Raman scattering, which comprises the following steps: step 1, preparing a substrate with SERS effect; step 2, transferring two-dimensional nanomaterial on the surface of the SERS substrate prepared in step 1, and the thickness of the two-dimensional nanomaterial is not more than 2 nm; step 3, selecting a solution with SERS effect and heat-sensitive effect and combining the solution with the solid part obtained in step 2; and step 4, performing Raman spectrum measurement on the solid-liquid system prepared in step 3 under variable laser power, obtaining the offset amount of the Raman spectrum characteristic peaks on both sides of the solid-liquid interface with the incident laser power by changing the incident power of the Raman laser, and determining the temperature rise of the solid-liquid interface through the offset amount. The measurement type is non-contact measurement, the integrity of the measured sample can be maintained, and different kinds of solid materials can be used for thermal resistance measurement according to actual measurement requirements.

The utility model discloses a high-pressure reaction device and a Raman analysis device. The high-pressure reaction device comprises a reaction kettle, a first sapphire glass window, a temperature control system and a pressure sensor, the reaction kettle comprises a kettle cover and a kettle body, a reaction cavity is formed in the reaction kettle and used for generating hydrates, the kettle cover and the kettle body are detachably connected to open and close the reaction cavity, and the kettle body is rotatably arranged; the first sapphire glass window is arranged on the side wall of the kettle body, and the Raman laser can penetrate through the first sapphire glass window by rotating the kettle body so as to irradiate the hydrate in the reaction cavity; the temperature control system is connected with the reaction kettle so as to control the temperature in the reaction cavity; and the pressure sensor is connected with the reaction kettle so as to measure the pressure in the reaction cavity. The Raman analysis device comprises the high-pressure reaction device. According to the high-pressure reaction device, the distribution characteristic change of hydrates in the longitudinal direction can be observed, the operation is convenient, and the experiment accuracy can be improved. The method is applied to the technical field of Raman analysis.

The invention provides a double-laser liquid drop control measurement method and device.The double-laser liquid drop control measurement method comprises the steps that nano-particle liquid drops are prepared, and the nano-particle liquid drops are placed on a glass substrate of a pre-configured liquid drop operation table; laser is emitted through the liquid drop operation table, laser parameters are adjusted, the laser is made to be focused in the nano-particle liquid drops, and the nano-particle liquid drops are driven to move; raman laser penetrating through the nano-particle liquid drops is emitted through the liquid drop operation table, and the internal characteristics and the movement condition of the nano-particle liquid drops are determined according to the imaging result of the Raman laser; the internal characteristics include real-time temperature and structural characteristics. By means of the method and device, accurate control over liquid drop fluid flowing is achieved, the movement condition of nano-particle liquid drops can be fed back in real time in the control process, and the problem that in the prior art, the liquid drop control accuracy degree is poor is solved.

The invention relates to a real-time vibration compensation device and method for a cold atom gravimeter. The device comprises a Raman laser, a rubidium atomic group, a reflector, an accelerometer, an optical phase-locked loop module, an analog-to-digital converter, a reference clock source, a heteronuclear FPGA, a direct frequency generation module and an upper computer. Two pairs of Raman lasers oppositely act on a rubidium atomic group in the vertical direction, the accelerometer and the reflector are in rigid connection, analog differential signals of the accelerometer enter the analog-digital converter, converted digital signals enter the heteronuclear FPGA for digital calculation, and the reference clock source serves as clock signals of the digital circuit. A signal calculated by the heteronuclear FPGA enters the direct frequency generation module and is output to the optical phase-locked loop to control the phase of the Raman laser, and the heteronuclear FPGA communicates with the upper computer through TCP connection. The vibration real-time compensation device for the cold atom gravimeter is fully digital, and has the advantages of large dynamic range, low noise and high-precision phase synchronization compensation capability.

The application discloses a narrow linewidth tunable Raman laser and an emission method, relates to the field of Raman lasers, and comprises a half-wave plate, a pump source and a focusing lens which are arranged on the two sides of the half-wave plate, a laser resonant cavity is arranged on the other side of the focusing lens, a cavity locking frequency doubler is arranged on the other side of the laser resonant cavity, a shaping lens group is arranged between the laser resonant cavity and the cavity locking frequency doubler, a dichroic mirror is arranged on the other side of the cavity locking frequency doubler, the laser resonant cavity is arranged in a V-shaped cavity structure which is composed of an input mirror, an output mirror and a reflective blazed grating, a diamond crystal is arranged between the input mirror and the output mirror, and the reflective blazed grating is arranged below the diamond crystal. The stability of the laser resonant cavity is improved through the design of the cavity mirror, the wavelength adjustment is accurate to 0.01 nm, and the loss in the transmission process is reduced through the cavity locking frequency doubler of the ring-shaped cavity structure.

The application relates to a Raman laser carrier sideband ratio feedback control system and a control method thereof. The system is used for controlling an IQ modulator of a cold atom interferometer laser system. The control system comprises an F-P resonant cavity, which is used for receiving Raman laser output by the IQ modulator, and simultaneously adjusting the cavity length of the F-P resonant cavity in real time, so as to identify and output transmitted light of different frequency components to a photoelectric detector. The photoelectric detector is used for detecting the transmitted light of different frequency components, so as to output intensity signals of different frequency components to a calculation module. The calculation module is used for collecting the intensity signals of different frequency components, and calculating and outputting the Raman laser carrier sideband ratio to a feedback control module. The feedback control module is used for performing error feedback control on the IQ modulator according to the Raman laser carrier sideband ratio and a preset carrier sideband ratio expected value, so as to realize the locking control of the Raman laser carrier sideband ratio. The application can improve the measurement accuracy and long-term stability of the cold atom interferometer laser system.

The present invention provides an intracavity-pumped diamond mid-infrared Raman laser generating device and method. The device: a high-brightness laser pump source, a reflective laser beam expander-focusing device, a resonator input mirror, a laser gain medium, and a resonator output mirror are sequentially arranged at intervals to form a laser generating device. The method: according to the target laser wavelength, the optimal pump wavelength is calculated by the first-order and second-order Raman frequency shift formulas; according to the Raman gain relationship between the pump wavelength and the diamond crystal, the optimal values of the pump spot size, the mode field diameter of the Raman signal laser, and the diamond crystal length are designed; the resonator input mirror and the resonator output mirror are precisely adjusted to obtain the required Raman signal laser output; the switching of the output laser wavelength is achieved through the type of dielectric film of the resonator output mirror; continuous tunability of any wavelength from 2500 nm to 3780 nm of the output laser is realized. The device and method can achieve multi-wavelength output and can effectively output mid-infrared lasers in the 2 μm - 5 μm band.