39 results about "Polarimeter" patented technology

The utility model relates to the technical field of polarimeters, in particular to an anti-shaking high-precision automatic polarimeter with a limiting function, which comprises a polarimeter main body, a detection cavity is arranged on the polarimeter main body, one side of the polarimeter main body close to the detection cavity is rotatably provided with a turning cover, and a support plate is fixedly connected in the detection cavity; clamping covers are arranged on the two sides of the supporting plate respectively, and a test tube body is arranged between the two clamping covers. The clamping covers are driven by the driving mechanism to clamp the two ends of the test tube body, the clamping covers can be attached to the outer walls of the two ends of the test tube through the arc-shaped grooves with the inner sides matched with the shape of the test tube to form wrapping type positioning, the axial displacement space of the test tube is directly limited, and the double fixing effects of axial limiting and radial restraining are achieved; the technical problems that a test tube of a high-precision automatic polarimeter can only exert clamping force on the test tube in the horizontal direction in the limiting process, the clamping tightness degree is different, the test tube is likely to move in the axial direction, and the error risk of measured data is increased are solved.

The present disclosure describes systems and methods for laser diagnostics systems (e.g., systems and methods for beam combination in heterodyne interferometers and polarimeters). For instance, a laser beam combiner, including a modulator and a wedge combiner, may be implemented in a heterodyne dispersion interferometer. In some cases, a modulator receives laser light (e.g., the laser light having a combination of a vertical polarization component and a horizontal polarization component) and the modulator shifts a frequency of the laser polarization components relative to the other. A wedge combiner having an index of refraction, and the wedge combiner comprises a mirror surface coating a and transmissive surface coating configured to effectively combine different polarization components of the laser light using transmission and reflection techniques, according to embodiments described herein.

To provide a polarimeter that does not require replacement of components when performing calibration, and can perform calibration quickly, simply and precisely over a wide wavelength range by using a standard rotation angle of a polarizer instead of a standard sample.SOLUTION: A polarimeter can be calibrated using a rotation angle of a polarizer measured by rotating the polarizer. The polarimeter has: a light source; a polarizer; polarizer rotation means; an angle encoder that is attached to the polarizer, and measures an angle by which the polarizer is rotated; an analyzer; analyzer rotation means; detection means; and control means for performing processing of, during calibration of the polarimeter, rotating the polarizer using the polarizer rotation means when there is no sample or cell in a sample chamber, and comparing a standard rotation angle that the rotation angle of the polarizer is measured by the angle encoder, with an angle of rotation, which is an angle by which the analyzer rotation means rotates the analyzer from a rotation position where the amount of light received by the detection means is minimized to a rotation position where the amount of light received is minimized when linearly polarized light is rotated and the amount of light received is no longer minimum.SELECTED DRAWING: Figure 3

The present application relates to a kind of global calibration and measuring method and device of polarimeter, first, the full-wave band light intensity information of standard sample in measurement system is measured, and the measured Fourier coefficient of standard sample is obtained by Fourier transform to light intensity information;Using the measured Fourier coefficient of standard sample and its theoretical Fourier coefficient, global system parameter is iteratively fitted;Then, the full-wave band light intensity information of the sample to be measured is measured, and the Fourier coefficient of the sample to be measured is obtained by Fourier transform to light intensity information;Using global system parameter and the Fourier coefficient of the sample to be measured, the full-wave band polarization of the sample to be measured is calculated.The present application carries out global system calibration and measurement by global system parameter, avoids the overfitting phenomenon generated by fitting system parameter by wavelength-by-wavelength method.

The invention discloses an air refractive index measurement method and device based on interference light polarization parameter detection, a dual-frequency laser emits a beam of mutually orthogonal linearly polarized light, the linearly polarized light is separated into two beams of light according to the polarization direction, and the two beams of light are respectively modulated into 45-degree linearly polarized light through a polaroid and a wave plate and are converged on a spectroscope. And then respective interference signals are formed after passing through the polarizing beam splitter, the wave plate, the vacuum cavity, the fixed mirror and the movable mirror, and are detected by the two polarimeters. The change of polarization azimuth angles of interference light is caused by performing vacuum treatment on the vacuum cavity, the difference value of the polarization azimuth angle change can be detected by the polarimeter, the refractive index of air is measured in real time by measuring the difference value change of the polarization azimuth angles of two paths of interference signals, and the measurement precision can reach 10 <-9 >. Different vacuum loop distance measurement and polarization azimuth angle measurement are combined, the measurement error introduced by the air refractive index is corrected in real time, and the measurement precision of the interferometer is improved.

The utility model discloses an automatic disc light rotating instrument. A base, a camera, a camera support, a stepping motor, a coaxial device, a stepping motor driver, a wiring serial port and a controller are installed on an existing polarimeter. According to the utility model, by introducing the camera and the image processing technology, automatic identification and accurate measurement of the trisection view field in the eyepiece of the polarimeter are realized; the stepping motor and the dial are coaxially mounted through the coaxial device, so that the step number of the stepping motor is consistent with the rotation angle of the dial, the rotation angle of the dial is accurately controlled, the accuracy and efficiency of measurement are remarkably improved, personal errors are reduced, and the measurement precision is improved; the device disclosed by the utility model has the remarkable technical effects and progress of high precision, automation, simplicity and convenience in operation and the like, provides a new thought and solution for scientific research and technical application in the fields of chemical analysis, biological pharmacy and the like, and has wide market application prospect and industrialization value.

An s-SNOM subsurface defect fine imaging method and system based on polarization laser scattering guidance belong to the technical field of optical nondestructive testing, and are realized based on a laser, a polarizer, a polarization modulator, a sample to be tested, an optical splitter array, an analyzer array and a detector which are sequentially arranged along the laser propagation direction, and the sample to be tested comprises subsurface defects. Firstly, a to-be-detected sample is subjected to polarization scattering rapid detection to obtain polarization scattering data; secondly, performing quantitative analysis and risk assessment on the non-uniformity of the subsurface structure to obtain a region of interest; thirdly, performing region-of-interest extraction and detection task scheduling on the high-risk region; and finally, performing high-resolution near-field scanning imaging on the region of interest. On the basis of keeping the advantage of s-SNOM high-resolution imaging, cross-scale cooperation between polarization scattering information and near-field imaging can be realized by introducing a rapid and effective prior guiding mechanism, and efficiency and precision are both considered in large-area sample detection.

The utility model relates to a stable base for an automatic polarimeter, which belongs to the technical field of polarimeter bases and comprises a mounting plate, gradienters arranged on two sides of the mounting plate, leveling components arranged in an array are arranged on the mounting plate, a fixing component is clamped on the mounting plate in a sliding manner, a sliding groove is formed in the mounting plate, and positioning holes arranged in an array are formed in the inner wall of the sliding groove. The leveling assembly comprises a mounting sleeve, the mounting sleeve is fixedly mounted on the mounting plate, a threaded rod is rotatably mounted on the mounting sleeve, a hand wheel is arranged at the upper end of the threaded rod, a leveling rod is slidably clamped in the mounting sleeve, and polarimeters of different specifications can be fixed through the fixing assembly, the sliding groove and the positioning hole; according to the technical scheme, displacement of the polarimeter in the detection process is effectively prevented, the accuracy of a measurement result is ensured, the applicability of the technical scheme is improved, the influence of uneven table facet on the measurement result is eliminated through the leveling assembly and the gradienter, it is guaranteed that the automatic polarimeter is located at the horizontal position, and a foundation is provided for accurate measurement.

The utility model provides an alfacalcidol chiral selection reaction endpoint judgment device which comprises a reaction device, a detection device and a peristaltic pump, the detection device comprises an optical rotation measurement test tube and a polarimeter, and the optical rotation measurement test tube is arranged between a light source and a probe of the polarimeter; an inlet and an outlet at two ends of the optical rotation measuring test tube are respectively inserted into reaction liquid in the reaction device through hoses, and peristaltic pumps are arranged on pipelines of the hoses. According to the reaction endpoint judgment device disclosed by the utility model, the reaction device is creatively and directly combined with the polarimeter, the reaction liquid in the reaction is directly and circularly communicated to the polarimeter by utilizing the detection device, and the optical rotation change condition of the reaction liquid is measured in real time through the polarimeter, so that whether the synthetic reaction reaches the endpoint or not is indirectly judged; the determination method is accurate, high in efficiency and suitable for industrial production.

The utility model relates to the technical field of polarimeters, in particular to a vortex polarimeter, which comprises a polarization state generator, a first diaphragm, a polarization analyzer, a 4F imaging system and a computer, the polarization state generator is used for converting a light beam into a linear polarization vortex light beam, a to-be-measured optical rotation solution is placed on an emergent light path of the polarization state generator, the first diaphragm is mounted on an incident light path of the to-be-measured optical rotation solution, and the polarization analyzer is mounted on the emergent light path of the to-be-measured optical rotation solution; the linear polarization vortex light beam passes through a to-be-detected optical rotation solution and then enters the polarization analyzer, the 4F imaging system is installed on an emergent light path of the polarization analyzer, and the 4F imaging system is used for imaging the polarization analyzer and sending a collected polarized light image to the computer for analysis. According to the vortex polarimeter, a transmission-type light path is adopted and combined with a 4F imaging system, so that the accuracy of optical rotation measurement is effectively improved, the detection work of a to-be-detected optical rotation solution with relatively high concentration can be realized, and in addition, the vortex polarimeter is simple in structure and relatively low in cost.

The invention discloses an anti-interference differential polarimeter, which belongs to the technical field of optical measurement instruments, organically combines magneto-optical modulation with a polarization difference method for the first time, solves the problem of weak optical rotation signal detection in an open environment, has a lower glucose solution measurement limit of 0.020 g / mL, has greatly improved anti-interference capability compared with a traditional polarimeter, and has a wide application prospect. For solutions with different concentrations, the average error is maintained at a lower level of 3.25%, not only can light source fluctuation and ambient light interference be overcome and stable measurement be realized, but also subjective judgment of human eyes can be eliminated and objective quantitative reading can be realized. According to the invention, accurate measurement of a glucose solution in a range of 0.020-0.400 g / mL can be realized, automatic data acquisition and real-time concentration display are realized, and the system integrates electromagnetism, optics and information science, can be used as an ideal platform for college physical experiment and common physical experiment teaching, and has a wide application prospect. The method can also be popularized to measurement of physical quantities such as magneto-optical Kerr effect, weak magnetic field and micro displacement, and is wide in application prospect.

An antimonene-based surface plasmon resonance prism coupler sensor, a miRNA detection device, a dual-retarder polarimetry system, and a method for detecting a concentration of a miRNA in a biological sample are provided. The antimonene-based surface plasmon resonance prism coupler sensor includes a prism, a tantalum pentoxide thin film layer, a gold thin film layer and an antimonene layer in sequence from bottom to top. The miRNA detection device includes the antimonene-based surface plasmon resonance prism coupler sensor, a capture nucleic acid, a detection probe and a reporter nucleic acid set. The dual-retarder polarimetry system includes the miRNA detection device, a light source, a polarizer, a liquid crystal phase variable retarder group, a Stokes polarimeter and a computing module. The method includes using the dual-retarder polarimetry system with a decomposition Mueller matrix to detect the concentration of the miRNA in the biological sample.

The application belongs to the technical field of polarization imaging, and relates to a wide-band Sagnac snapshot full-polarization imaging system and an endoscope. The system comprises a first non-polarized light beam splitter and a second MDCPSI system arranged at intervals on a first optical axis, a first MDCPSI system and a first non-polarized light beam splitter arranged at intervals on a second optical axis perpendicular to the first optical axis, a first plane mirror and a second MDCPSI system arranged at intervals on a third optical axis, a first plane mirror, a second non-polarized light beam splitter, a polarimeter and a detector arranged at intervals on a fourth optical axis parallel to the second optical axis in sequence, the detector and a processor are electrically connected, a second plane mirror and a first MDCPSI system arranged at intervals on a fifth optical axis parallel to the first optical axis in sequence, and a second plane mirror and a second non-polarized light beam splitter arranged at intervals on a sixth optical axis parallel to the third optical axis. The application can provide a high-resolution, low-noise full-polarization image, and provides a new scheme for real-time polarization imaging in surgical operations.

The utility model discloses a dustproof structure for an automatic polarimeter, and aims to solve the technical problem that in the prior art, dust is easy to penetrate through a gap of a cabin cover to enter a sample pool, and the instrument is easy to interfere in the detection process. Comprising a polarimeter body, a placement groove is formed in the surface of the polarimeter body, a hatch cover is movably connected in the placement groove, two cavities are formed in the hatch cover and are a transmission cavity and a compression cavity respectively, and a first sealing air bag is fixedly connected to the position, close to the bottom face, of the side wall of the hatch cover. The end face of the bottom of the hatch cover is fixedly connected with a first sealing air bag, the end face of the bottom of the hatch cover is fixedly connected with a second sealing air bag, the first sealing air bag and the second sealing air bag abut against the side wall of the containing groove, and an inflation assembly is arranged in the compression cavity. And dust is prevented from entering the sample cell.

The application belongs to the technical field of optical polarization measurement, and discloses a full-Stokes polarimeter and a preparation method thereof. The full-Stokes polarimeter comprises a substrate, metal electrodes, an anisotropic crystal material film and an insulating packaging material film. A plurality of pairs of metal electrodes are arranged on the substrate. Two pairs of metal electrodes and a piece of anisotropic crystal material film constitute a detection unit. In each detection unit, the anisotropic crystal material film covers the metal electrodes. The full-Stokes polarimeter comprises at least two detection units, and the detection units are symmetrically distributed at the center of the substrate and are located on the same plane. The crystal directions of the anisotropic crystal material films of the detection units form a set of twist angles. The insulating packaging material film covers the anisotropic crystal material film. The full-Stokes polarimeter can identify the Stokes parameters of full polarization, and has the characteristics of miniaturization, integration, high sensitivity and fast response, and has wide application prospects in the fields of optical fiber communication and sensing.

The invention relates to a differential phase polarimeter (10), comprising a light source (12) for polarized irradiation light (14); a sample chamber (16) for a test object (18), the sample chamber (16) being arranged such that the test object (18) can be irradiated with the irradiation light (14); a linear polarizer (20) arranged downstream of the sample chamber (16) in the light propagation direction; and a detector (22) arranged downstream of the linear polarizer (20) in the light propagation direction and designed to detect a light intensity of the irradiation light (14) which has passed through the linear polarizer (20); wherein the detector (22) is spatially resolving and arranged in such a way that both test object light (32) which has passed through the test object (18) and background light (34) which has not passed through the test object (18) can be detected.

The application belongs to the technical field of optical fiber measurement, and particularly relates to an optical frequency domain polarimeter of polarization beam splitting structure frequency shift detection with ultra-high sensitivity, which comprises a tunable laser source module, a device to be measured module, a polarization beam splitting frequency shift interferometer module, an auxiliary interferometer module and a signal acquisition and analysis module, and is characterized in that: a frequency shifter contained in the polarization beam splitting frequency shift interferometer module is used to move the signal to a high frequency, thereby avoiding the noise aliasing problem from a low frequency; a polarization beam splitter is used to separate the transmission mode and the coupling mode light passing through the device to be measured to suppress the main interference peak, thereby improving the sensitivity to-130 dB, and greatly improving the speed and sensitivity of the polarization crosstalk measurement in principle. Meanwhile, the main extended optical fiber and the acousto-optic modulator are combined to shift the signal, thereby meeting the acquisition of the polarization crosstalk information when the long-distance device is tested.

The invention relates to the technical field of optics, and discloses an on-line attaching system and method for an achromatic wave plate so as to improve the preparation yield. The system comprises a wide-spectrum light source, a light beam shaping assembly, a polarizer, an electric control delayer and a rotary displacement table. The electric control delayer adjusts the retardation of the liquid crystal variable delayer through the output voltage of the voltage controller; the rotary displacement table is used for stacking the wave plates and can drive the carried wave plates to rotate around an optical axis; a transmission light beam of the rotary displacement table enters a beam splitter through a polarization analyzer and then enters a camera and a spectrograph; wherein the retardation amount of the liquid crystal variable retarder is used for being matched with the stacked wave plates to determine an angle which is closest to extinction and is presented on a spectrograph through rotation, and then a camera tracks a light spot movement track of a circle of synchronous rotation of the stacked series wave plates at the angle; and the glue dripping wave plate is pressed and adjusted at the corresponding position, so that after the light spot directivity index represented by the light spot movement track meets the expectation, curing is completed at the angle.

The invention provides an adjustable amplification signal feedback loop of a full-automatic polarimeter and a gain control method, and belongs to the technical field of polarimeter signal adjustment. The circuit specifically comprises a signal input and preprocessing circuit, a pre-amplification and signal conditioning circuit, a core signal processing circuit, an automatic gain control circuit, a power supply and decoupling circuit and an output buffer circuit which are electrically connected in sequence, the signal input and preprocessing circuit is used for receiving and preprocessing a weak optical rotation modulation signal output by the photoelectric detector; the pre-amplification and signal conditioning circuit is used for amplifying and filtering the preprocessed signal; the adjustable amplification signal feedback loop can solve the problem that an existing full-automatic polarimeter is difficult to select a proper amplification factor under the condition that the difference of the light transmission of a test solution is large.

The invention discloses a Ga2O3 baseline polarization solar blind detector and a polarimeter. The Ga2O3 baseline polarization solar blind detector mainly comprises a Si / SiO2 or another PDMS substrate, a beta-Ga2O3 film prepared based on a traditional mechanical stripping method, and a double-interdigital gold electrode prepared by using an electron beam lithography or thermal evaporation method. The Si / SiO2 or another PDMS substrate is used as a carrier of the lowest layer, the beta-Ga2O3 film is used as a middle photosensitive layer, and the double-interdigital gold electrode absorbs photon-generated carriers of the beta-Ga2O3 film on the uppermost layer. Ultraviolet polarized light with a certain incident power density is applied to irradiate the Ga2O3 baseline polarization solar blind detector, the transmission spectrum and other performance characterization data are measured, and it can be powerfully proved that the Ga2O3 baseline polarization solar blind detector has solar blind light response with high polarization sensitivity.

The application discloses a kind of transmission spectrum matrix and absorbance spectrum matrix measurement system, including along optical path successively arranged infrared light source, collimating lens, interference system, polarizing system, sample bin, polarimeter system, lens, detector and computer processing system;Interference system includes beam splitter, fixed mirror and moving mirror;Wherein beam splitter is cubic component, and the face of its circumferential four faces and collimating lens is face A, from face A along clockwise direction, it is face B, face C and face D in sequence;Fixed mirror is arranged at face B;Moving mirror is arranged at face C;Polarizing system is arranged at face D, including along optical path successively arranged polarizer and extinction ratio 1 / 4 wave plate;Polarimeter system includes along optical path successively arranged extinction ratio 1 / 4 wave plate and polarizer;Computer processing system is used to acquire polarization information and calculate to obtain transmission spectrum matrix and absorbance spectrum matrix.The application also discloses a kind of transmission spectrum matrix and absorbance spectrum matrix measurement system measurement method.

The application provides a high-contrast polarization imaging system for direct imaging of exoplanets, which comprises a coronagraph system, a relay lens, a polarization modulation assembly based on phase modulation, an imaging lens and a detector. A polarimeter is introduced on the basis of the coronagraph system, a liquid crystal phase retarder is used as a modulation device, different intensity values are obtained by applying different voltages, and finally the Stoeks parameter is inverted. In view of the fact that the planet light has certain polarization characteristics and the star light has no polarization characteristics, the planet light can be distinguished from the star light after passing through the high-contrast polarization imaging system, and high-contrast polarization imaging is realized. Meanwhile, the system introduces a Wollaston prism to form a double light path, so as to reduce the influence of atmospheric turbulence, and meanwhile, additional contrast gain can be obtained, and an imaging contrast gain of about 100 times can be realized.

The invention belongs to the technical field of polarization imaging, and relates to a broadband Sagnac snapshot type full-polarization imaging system and endoscop.The system comprises a first non-polarized light beam splitter and a second MDCPSI system which are arranged on a first optical axis in a spaced mode, a first MDCPSI system and a first non-polarized light beam splitter which are arranged on a second optical axis perpendicular to the first optical axis in a spaced mode, and a second MDCPSI system and a second non-polarized light beam splitter which are arranged on a second optical axis perpendicular to the second optical axis in a spaced mode. The first plane mirror and the second MDCPSI system are arranged on a third optical axis at intervals, the first plane mirror, the second non-polarized light beam splitter, the polarization analyzer and the detector are sequentially arranged on a fourth optical axis parallel to the second optical axis at intervals, and the detector is electrically connected with the processor. The second plane mirror and the first MDCPSI system are sequentially arranged on a fifth optical axis parallel to the first optical axis at intervals, and the second plane mirror and the second non-polarized light beam splitter are arranged on a sixth optical axis parallel to the third optical axis at intervals. According to the invention, a high-resolution and low-noise full-polarization image can be provided, and a new scheme is provided for real-time polarization imaging in a surgical operation.

The present application relates to the technical field of optical equipment, and discloses a calibration method and system of a polarization measuring instrument to improve calibration accuracy. The method comprises the following steps: determining an iteration step for adjusting the included angle between a polarizing polarizer and an analyzing polarizer; in each iteration process, obtaining a light intensity variation curve corresponding to one rotation of a wave plate from the acquisition of a detector, performing fast Fourier transform on the light intensity variation curve to obtain a group of coefficients, and calculating the R value corresponding to the included angle between the polarizing polarizer and the analyzing polarizer in each iteration process according to the group of coefficients; drawing a curve of the included angle between the polarizing polarizer and the analyzing polarizer and the R value, finding two included angles that are 90 degrees apart and have the closest R value difference of 0 in the curve, and determining that the included angle corresponding to the two included angles between the polarizing polarizer and the analyzing polarizer is a ±45 degree relationship; and rotating the analyzing polarizer to be parallel to the polarizing polarizer serving as a reference based on the included angle between the polarizing polarizer and the analyzing polarizer being a ±45 degree relationship.

The application discloses a polarization extinction ratio testing device for large-core polarization maintaining optical fiber, and is characterized by comprising the following parts: a non-coherent polarized light source, a polarization maintaining mode field adapter, a focusing coupling system, a cladding light filter, a collimating mirror, a polarimeter and a power meter; the non-coherent polarized light source outputs high-quality non-coherent polarization maintaining linear polarized light, the light enters the large-core polarization maintaining optical fiber to be tested through the polarization maintaining mode field adapter and the focusing coupling system, and is emitted under the action of the cladding light filter, the energy of the output parallel light of the polarization maintaining fiber core is concentrated through the collimator, and the light enters the power meter through the polarimeter. The application uses a non-coherent light source as a testing light source, thereby reducing the coupling between modes, simultaneously uses a mode field adapter to control the mode of the completely polarized signal light to be a base mode state input, simultaneously matches the mode field, reduces the component of high-order modes, thereby cooperatively reduces the coherent superposition between different modes, thereby stabilizes the power test results under different polarization states, makes the extinction ratio test results stable and accurate, and has high consistency.

The utility model relates to an automatic polarimeter convenient to observe, which belongs to the technical field of automatic polarimeters and comprises a mounting seat and an automatic polarimeter body, a rotating groove is arranged at the upper end of the mounting seat, a circular plate is rotatably mounted in the rotating groove, a limiting component is mounted at one end of the mounting seat, and one end of the limiting component is connected with the circular plate. The first telescopic rods are installed at the upper end of the circular plate in a circumferential array mode, the automatic polarimeter body is fixedly installed at the free ends of the first telescopic rods, the lifting assembly is installed in the middle of the circular plate, one end of the lifting assembly is connected with the automatic polarimeter body, the square rod is driven by rotating the lead screw to move up and down, and the position of the automatic polarimeter body is automatically adjusted. The angle of the automatic polarimeter body can be adjusted by manually rotating the circular plate, so that a user can conveniently observe a detection result.

The application discloses a full-Stokes parameter analyzer and a polarization measurement method thereof. The analyzer comprises three potassium dideuterium phosphate electro-optic crystal modulators, a fixed delay device, a polarimeter, an imaging lens, a detector, a computer, a signal generator and an alternating-current high-voltage modulator. The incident target light beam sequentially passes through the first KD*P, the second KD * P, the fixed delay device, the third KD * P and the polarimeter, and then is incident on the detector through the imaging lens. The signal generator outputs four frequency-doubled signals after receiving a measurement instruction from the computer, and outputs one signal to the detector and the other three signals to the alternating-current high-voltage modulator. The alternating-current high-voltage modulator controls the phase delay of the first to third KD*P to change periodically in the form of ±45°, ±60° and ±90° square waves by using the three signals. The detector converts the optical signal into an electrical signal and sends the electrical signal to the computer for processing, so that the full-Stokes parameters of the target light beam are obtained.

The application discloses a kind of preparation system and method of Rydberg state based on orthogonal polarization detection and dual-wavelength in-room frequency stabilization, belong to quantum optics and precise measurement field.System includes: atomic gas chamber, first / second wavelength laser, modulation transfer spectrum frequency stabilization unit, dual-wavelength in-room coupling unit, orthogonal polarization detection unit and servo feedback control system.Method by modulation transfer spectrum locking probe light frequency;By dual-wavelength in-room coupling, modulation information is transferred to coupling light across wavelength;By orthogonal polarization detection, the polarization state change caused by the interaction of coupling light and atom resonance is extracted, error signal is generated and coupling light frequency is locked.The core of the application is: only resonance atom causes coupling light field polarization state rotation, non-resonant atom has no contribution;By polarimeter to the polarization component of outgoing light screening, only extract the polarization rotation signal produced by resonance atom, effectively suppress the high DC background noise of laser itself, greatly improve signal purity and signal-to-noise ratio.

The invention relates to a differential phase polarimeter (10) with a light source (12) for polarized irradiation light (14), a sample chamber (16) for a test specimen (18), wherein the sample chamber (16) is arranged so that the test specimen (18) can be irradiated with the irradiation light (14), a linear polarizer (20) which is arranged behind the sample chamber (16) in the direction of light propagation, and a detector (22) which is arranged behind the linear polarizer (20) in the direction of light propagation and is configured to detect a light intensity of the irradiation light (14) that has passed through the linear polarizer (20), wherein the detector (22) is spatially resolving and is arranged so that both test specimen light (32) that has passed through the test specimen (18) and background light (34) that has not passed through the test specimen (18) can be detected.