197 results about "Optical rotation" patented technology

The invention discloses a laser frequency stabilization system based on Faraday anomalous dispersion atomic filtering, which is used for carrying out frequency stabilization on phase modulation multi-sideband laser, and comprises a frequency doubling laser unit which is configured to comprise a fundamental frequency seed light source, an electro-optical modulator, a fundamental frequency amplifier and a frequency doubling crystal; the light splitting module unit is configured to split the frequency doubling light into a main output light path and a monitoring light path; the atomic optical rotation filter is located on the monitoring light path and is configured to maintain the purity of the frequency-stabilized laser spectrum through purification treatment under the control of the axial magnetic field and the temperature; the frequency stabilization unit is configured to be a frequency stabilization light path and a servo system, and the frequency stabilization light path is used for obtaining laser frequency information and generating an error signal; the servo system is used for controlling the frequency of the fundamental frequency seed light source according to the error signal feedback. According to the laser frequency stabilization system provided by the invention, the spectrum purification and frequency stabilization precision can be improved, so that high-frequency stability locking is realized.

According to the SERF magnetic field measuring device closed-loop magnetic compensation method based on double-beam detection, Y-axis direction detection light used for decoupling is added on the basis of X-axis direction detection light, decoupling of three-axis magnetic field signals can be achieved, independent measurement and closed-loop control real-time magnetic compensation of a three-axis magnetic field are achieved, support is provided for further improving compensation precision, and the method is suitable for large-scale popularization and application. Comprising the steps that Y-axis direction detection light penetrating through an alkali metal gas chamber in the Y-axis direction, X-axis direction detection light penetrating through the alkali metal gas chamber in the X-axis direction and pumping light penetrating through the alkali metal gas chamber in the Z-axis direction are arranged in the SERF magnetic field measuring device, the X-axis direction detection light is used for detecting the optical rotation angle, and the Y-axis direction detection light is used for three-axis magnetic field decoupling; the pumping light is used for polarizing atoms in the alkali metal gas chamber; adding a Y-axis calibration signal; controlling the Z-axis coil current to compensate the Z-axis magnetic field according to the Py; controlling the X-axis coil current to compensate the X-axis magnetic field according to the Py; and controlling the Y-axis coil current to compensate the Y-axis magnetic field according to the Px.

The utility model relates to the technical field of optics, is used for solving the problem that display of a display screen is in a gray white shape when the screen is turned off, and provides a display screen which comprises a display layer, a touch layer / cover plate layer and an optical rotation integrated black composite film arranged between the display layer and the touch layer / cover plate layer and used for the display screen. The optical rotation integrated black composite film for the display screen comprises a quarter-wave plate layer, a polaroid layer and an adhesive layer which are sequentially arranged in a stacked mode, the quarter-wave plate layer is arranged on the light emitting side of a display layer in an attached mode, and the adhesive layer is arranged on the inner surface side of a touch layer / cover plate layer in an attached mode; ambient light is converted into first linear polarized light through the polaroid layer during incidence; the polarized light is converted into left-hand circularly polarized light or right-hand circularly polarized light through the quarter-wave plate layer; when the ambient light is emitted, the ambient light is reflected and converted into reverse right-handed circularly polarized light or left-handed circularly polarized light through the display layer; the second linear polarized light is converted into second linear polarized light through the quarter-wave plate layer and is blocked by the polaroid layer, so that the display screen displays integrated black after the screen is turned off.

The invention provides a preparation method and device of Bi2O3-B2O3 inverse magnetic rotation glass, and the preparation method comprises the following steps: (1) placing a glass raw material in a closed heating furnace, introducing ultra-dry oxygen, and simultaneously exhausting outwards to enable the pressure in the furnace body to be P1 which is more than or equal to 1kPa and less than or equal to 5kPa; (2) heating to melt the glass raw material in the furnace body into molten glass, raising the temperature to a clarification temperature, introducing the mixed gas into the molten glass by a bubbling method, simultaneously homogenizing and stirring, and stopping introducing the mixed gas and starting defoaming and stirring when the homogenizing and stirring time reaches t1; wherein the mixed gas comprises ultra-dry oxygen and boron trichloride, the volume ratio of the ultra-dry oxygen to the boron trichloride is k, and k is (1-5): 1; (3) cooling, forming, annealing and pouring; in the step (2) and the step (3), the pressure in the furnace body is kept P1. The Bi2O3-B2O3 diamagnetic optical rotation glass prepared by the method disclosed by the invention is stable in magneto-optical performance and low in hydroxyl absorption coefficient in a middle-infrared band.

The LED screen comprises an LED screen body and an optical rotation integrated black composite film which is attached to the outer surface of the LED screen body and used for the LED screen, the optical rotation integrated black composite film used for the LED screen comprises an adhesive layer, a quarter-wave plate layer and a polaroid layer which are sequentially arranged in a stacked mode, and the adhesive layer is attached to the light emitting side of the LED screen body; the polaroid layer is used for converting ambient light into first linear polarized light when the ambient light is incident; the quarter-wave plate layer is used for converting the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when ambient light is incident; the left-hand circularly polarized light or the right-hand circularly polarized light is converted into reverse right-hand circularly polarized light or left-hand circularly polarized light when being reflected by the LED screen body; the reverse right-handed circularly polarized light or left-handed circularly polarized light is converted into second linear polarized light by the quarter-wave plate layer when being emitted, and the second linear polarized light rotates by 90 degrees relative to the first linear polarized light and is blocked by the polaroid, so that the LED screen displays integrated black after being turned off.

The invention relates to a quasi-differential wavefront segmentation double-beam interference device with a planar light path structural design, which has the structural characteristic of a non-closed optical path for transmitting a measurement light beam in a one-way manner. Space coherent light of a transverse mode vector filtering mechanism based on the Huygens principle / phased array principle instead of homologous transmission time coherent light is used as each light source, and a non-closed optical path is realized under the cooperation of a one-way transmission mode on a divided measuring light beam. The problem that the sum of the loop wavelength increment or the frequency increment of a closed path interference device is zero is solved, so that the purpose of measuring the first-level effect of anisotropic physical parameters of a measured object in a linear system is achieved, and the device is particularly suitable for immersion type online measurement. The optical elements have stable performance and sound self-adaptive mechanism and self-diagnosis capability through careful layout of the optical elements; and the method also has wide application prospects in basic physical research and novel navigation / positioning systems. The invention also provides a differential wavefront segmentation and semi-transparent and semi-reflective mirror beam combination interferometer device based on the planar light path structure design, and a wavefront segmentation interferometer device based on the planar light path structure design and provided with a pre-crossing area and a bending type one-way-two-way-common mode combination light path structure. The invention relates to a wavefront segmentation interferometer device of a one-way-two-way combined light path structure which is designed based on a planar light path structure and adopts polarization light splitting-beam combination, optical rotation processing of a reference light beam and original path returning, and a use method of an interference device.

An optical substrate and a display device are disclosed, relating to the field of display technology. The optical substrate includes multiple optical rotation regions and a first light-shielding region. The first light-shielding region is located between at least two adjacent optical rotation regions. The two adjacent optical rotation regions include a first optical rotation region and a second optical rotation region. The first optical rotation region is used to convert linearly polarized light with a predetermined polarization state in incident light into left-handed polarized light, and the second optical rotation region is used to convert linearly polarized light with a predetermined polarization state in incident light into right-handed polarized light. The optical substrate includes a substrate, and multiple touch electrodes and multiple touch traces disposed on one side of the substrate. The multiple touch electrodes are separated from each other and are not connected. Each touch electrode is connected to a touch trace in a one-to-one correspondence. The touch electrodes are used to detect the touch position of a touch object on the optical substrate. Furthermore, in the orthographic projection onto the substrate, the touch electrodes overlap with the optical rotation regions, and the touch traces are located within the range of the first light-shielding region.

The application provides a double-end optical lightning stroke positioning method and system applied to power overhead optical cables, and relates to the technical field of optical fiber sensing; the basic principle of positioning is to realize single-end lightning stroke positioning based on the obvious change of the polarization state of optical signals after the optical signals encounter lightning strokes; the application first uses counter-transmitted pulse polarized light to detect a single-end lightning stroke positioning point, then establishes a double-end positioning equation set to solve an actual lightning stroke positioning point, so that accurate lightning stroke positioning is realized; the application uses the Faraday optical rotation effect of lightning strokes on optical signals to realize lightning stroke positioning based on a polarized light time domain reflectometer; compared with traditional lightning stroke positioning, the application has low operation and maintenance cost, high precision, does not need wide-area accurate time synchronization, has a simple system, is convenient to install, and reduces the blind area of lightning stroke positioning.

The invention relates to the technical field of optics, and discloses a displacement adjusting method of a magneto-optical crystal, so as to meet the requirement that a user can conveniently, reliably, flexibly and manually switch among multiple wavelengths or multiple optical rotation angles. The method comprises the following steps: determining the magnetic flux density distribution of the magneto-optical crystal along the optical axis displacement in a target equipment magnetic cylinder to which the magneto-optical crystal belongs; determining the transmission relation of the adjusting ring of the target equipment in the process of circumferentially rotating around the optical axis to drive the magneto-optical crystal to move along the optical axis; calculating Vierdean constants respectively corresponding to the series of target wavelengths at the expected working temperature of the target equipment; according to the magnetic flux density distribution, the Viert constant and the length of the magneto-optical crystal, a series of positions where the magneto-optical crystal generates the same target optical rotation angle for polarized beams corresponding to different target wavelengths in the displacement process of the target magnetic cylinder are calibrated; and in the assembling process, the reference position is determined firstly, and then the corresponding scribed line on the adjusting ring is aligned with the reference line on the shell.

The application provides a polarization-dependent reflective two-stage optical ring, which comprises a first collimator, a first beam splitting cube, a first optical rotation component, a second beam splitting cube, a third beam splitting cube of a second optical rotation component and a second collimator arranged along a first optical path, and three beam splitting cubes are respectively light splitting dielectric films; the application combines the characteristics of a transmission two-stage ring and a reflective ring, two optical rotation components are arranged on the first optical path from the first collimator to the second collimator, thereby realizing the series connection of two isolation systems, playing a double-stage isolation effect, meanwhile, the application realizes the optical path folding of a second optical path from the second collimator to the third collimator by using a reflective component, and optical components are multiplexed in one of the optical rotation components, thereby also achieving a double-stage isolation effect; while realizing the double-stage isolation effect, the application also reduces the product volume, is beneficial to the integration of equipment and is also beneficial to cost reduction.

The present invention discloses a magnetic induction intensity detection device based on laser self-mixing interference. The laser light emitted by the laser is split by a spectrometer and then divided into two optical paths. A polarizer, a magneto-optical crystal, and a transducer are sequentially arranged on one optical path. The transducer is electrically connected to a control module, which generates a continuous sinusoidal wave signal to continuously control the transducer. A detector is arranged on the other optical path. The detector is electrically connected to a Fourier transform module, which analyzes the laser self-mixing interference signal obtained by the detector. The magneto-optical crystal is located inside a magnetic field. The laser light emitted by the laser is reflected multiple times between the laser and the transducer, and under the action of the polarizer, laser self-mixing interference is formed. In the present invention, the laser light is reflected multiple times between the laser and the transducer, which can enhance the Faraday rotation effect. In addition, the polarizer is used as a polarizer and an analyzer, which has the advantages of not requiring an external analyzer, reducing measurement costs, and improving sensitivity.

The utility model relates to a magneto-optical isolator and laser equipment. The magneto-optical isolator comprises a polarization light splitting element which can penetrate through first polarization light and block second polarization light, and the polarization light splitting element is provided with a first area and a second area; the optical rotation device is opposite to the first area; the magnetic optical rotation element is arranged on one side, opposite to the polarization light splitting element, of the optical rotation device and is provided with a third area and a fourth area; the conduction assembly enables light rays entering the magnetic rotation element from one of the third area and the fourth area to go back and forth in the magnetic rotation element and then to be emitted out from the other one of the third area and the fourth area; light emitted from the first area is converted into one of first polarization state light and second polarization state light after passing through the optical rotation device and the magnetic optical rotation element, and light emitted from the second area is converted into the other one of the first polarization state light and the second polarization state light after passing through the magnetic optical rotation element and the optical rotation device. According to the magneto-optical isolator, the miniaturization design can be realized.

The utility model relates to the technical field of optical equipment, in particular to an output type optical isolator, which comprises an optical rotation sheet with a groove mechanism and a small-hole diaphragm. When returning light appears, the plano-convex lens converges light spots of the returning light for the first time, the small-hole diaphragm partially blocks the converged light spots, and the energy of the returning light is reduced; the biconcave lens is used for carrying out secondary convergence on the blocked light spots; the second polarization splitting prism divides the secondarily converged light spots into reverse P light and reverse S light; under the combined action of the magnetic rotation crystal and an external magnetic field, the reverse P light and the reverse S light rotate anticlockwise; the optical rotation sheet performs first clockwise rotation on the reverse P light after counterclockwise rotation, and the groove mechanism of the optical rotation sheet completely blocks the reverse S light after counterclockwise rotation; finally, the rotated reverse P light and the blocked reverse S light cannot pass through the first polarization splitting prism to be combined, so that the reverse P light and the blocked reverse S light are isolated, and the damage of the returned light to a front-end laser element is avoided.

The application provides a method and device for identifying a lesion range of a urinary system by using interference optics, and the method comprises the following steps: obtaining a polarized image corresponding to a multi-layer optical rotation tomogram by filtering through a polaroid, and generating an original polarization image containing interference fringes and tissue texture; performing line extraction, intersection removal, Gaussian mask and smoothing reconstruction processing on the original polarization image to generate an interference bright line image; according to the light and dark distribution of the interference bright line image, optical rotation calculation and Mueller matrix correction are sequentially performed to generate tissue optical rotation distribution data; and the lesion range is identified by matching the tissue optical rotation distribution data with a preset calibration sample. Through multi-wavelength orthogonal polarization interference and optical rotation accurate detection, the ability to distinguish flat lesions and inflammatory mucosa is improved from the root, and the lesion boundary identification accuracy and identification efficiency are significantly improved.

The non-intrusive measuring system for the glucose concentration of the aqueous humor of the eyes comprises a linear polarization collimation light source which emits an incident polarized light beam along an advancing optical axis at a linear polarization starting angle, penetrates through a cornea, enters the aqueous humor and generates an emergent polarized light beam; the linear polarization starting angle of the incident polarized light beam is defined as a 45-degree rotation angle along the advancing direction of the advancing optical axis; the first polarization beam splitter is used for splitting the emergent polarized light beam into two emergent polarized light beam components with orthogonal polarization directions, and the two emergent polarized light beam components are respectively polarized at 0-degree and 90-degree rotation angles along respective advancing optical axis directions; the two light sensors are used for respectively measuring the light intensity of the two emergent polarized light beam components; an arithmetic processor for subtracting the light intensity to obtain a Schtort vector S1 component related to the amount of rotation of the polarization angle; and normalizing the S1 component by adding the light intensities of the emitted polarized light beam components as a standard value.

The utility model provides a reflective circulator for multiplexing crystals, which comprises a first multichannel circulator module, and the first multichannel circulator module comprises a first collimator array, a first light splitting crystal, a first half-wave plate group, a first optical rotation device, an offset crystal, a second optical rotation device and a first reflector which are sequentially arranged along a first direction; moreover, a second multi-channel circulator module is also arranged, and the second multi-channel circulator module comprises a second collimator array, a second light splitting crystal, a second half-wave plate group, a third optical rotation device, an offset crystal, a fourth optical rotation device and a second reflector which are sequentially arranged along a second direction. The first direction is perpendicular to the second direction. According to the utility model, the volume of the reflective circulator can be reduced.

The utility model is suitable for the technical field of optical equipment, and provides a Faraday rotator, an optical isolator and an optical circulator. The Faraday rotator comprises a magneto-optical component and a magnetic field applying piece, and the magnetic field applying piece can apply an external magnetic field to the magneto-optical component; the magneto-optical component can enable the polarization state of the polarized light to rotate by a preset angle along a first turning direction in an external magnetic field, and the preset angle forms an optical rotation angle; the magneto-optical component is provided with a light incident surface and a reflecting surface which are oppositely arranged, a first light-transmitting film and a second light-transmitting film are sequentially arranged on the light incident surface, and a first reflecting film is arranged on the reflecting surface; when one of the first light-transmitting film and the second light-transmitting film passes through the polarized light propagating toward the first reflective film, the other passes through the polarized light and emits the polarized light to the outside of the magneto-optical member. By means of the design, the Faraday rotator can still achieve the original effect on the premise that the size of the magnetic field generating piece is reduced, and reduction of the overall size of the Faraday rotator is facilitated.

The application discloses a method for measuring liquid density by using optical active solution, which comprises a laser, a polarizer, a liquid to be measured, an optical active solution, a transparent water tank, an electronic balance, an analyzer and a light screen. γ The optical active solution is filled in the transparent water tank with a length of l, and the mass of the optical active solution is γ, the mass of the solute is γ1, and the density is ρ X A certain mass (X) of the liquid to be measured is added, and after being uniformly stirred, the optical activity α of the mixed solution is measured by rotating the analyzer and the light screen; the relationship between X and α is obtained, that is, the data are linearly fitted by using a graphing method, and the density ρ X of the liquid to be measured is calculated by the slope of the straight line. The application is a method for measuring liquid density, and has clear physical principle, simple measurement process, high measurement accuracy and high repeatability.

To provide a simple and highly accurate photocurrent sensor.SOLUTION: A photocurrent sensor comprises: a polarized light separation portion provided between a light source and an optical fiber; a reflection portion provided at the other end of the optical fiber to reflect measurement light transmitted through the polarized light separation portion and incident on the optical fiber and including an optical rotator for optically rotating incident polarized light by approximately 45 degrees; a sensor fiber provided between the polarized light separation portion and the reflection portion; a detector that converts the measurement light subjected to intensity modulation by reciprocating in the sensor fiber and passing through the polarized light separation portion again into an electric signal.SELECTED DRAWING: Figure 1

A method for measuring and detecting weak SERF magnetic fields based on laser spatial modes avoids signal drift caused by fluctuations in laser power by directly measuring the spatial displacement of the detection laser beam. The method includes: Step 1, establishing a Sagnac interference loop using the transmitted and reflected light formed by the first polarizing beam splitter on the laser emission path of the alkali metal gas cell; Step 2, after mutual interference, the transmitted and reflected light return to the first polarizing beam splitter, combine, and exit the Sagnac interference loop, then pass sequentially through a second λ / 2 waveplate and a second polarizing beam splitter to complete a selection process; Step 3, using a quadrant detector to identify the change in detection beam displacement caused by the linear polarization rotation angle of the detection laser after the selection process; Step 4, determining the linear polarization rotation angle by the change in detection beam displacement, and then determining the x-direction component of the electron spin polarization vector using the linear polarization rotation angle, thereby achieving the measurement of weak SERF magnetic fields.

A real-time measurement device and method for pressure broadening based on the optical rotation effect, which can respectively measure the polarization ellipse rate and the optical rotation angle of polarized light by using the phase delay characteristic of an optical elastic modulator, and realize the measurement of the pressure broadening of an atomic gas cell according to the ratio relationship between the polarization ellipse rate and the optical rotation angle. Compared with the conventional method, the real-time measurement of pressure broadening in the present invention is not affected by other external factors such as the intensity of the detection light, the intensity of the pumping light, and the temperature of the gas cell, and can stably, accurately and rapidly measure the pressure broadening of the atomic gas cell under the conditions of large detuning measurement and interference in the experimental environment.

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 discloses a lossless switching magneto-optical switch, belonging to the field of optics. A first polarization beam splitter decomposes parallel light input from an input end into two sub-beams, p-light and s-light, with orthogonal polarization directions. The p-light and s-light form two main optical paths. A first half-wave plate can rotate the polarization direction of the p-light by 135° clockwise along the optical path transmission direction and the polarization direction of the s-light by 45° counterclockwise along the optical path transmission direction. A Faraday rotator crystal applies magnetic fields in different directions to rotate the main optical path by 45° clockwise or 45° counterclockwise, simultaneously generating two weak optical paths. A second polarization beam splitter converges the p-light and s-light of the two main optical paths to a first output end or a second output end, and converges the p-light and s-light of the two weak optical paths to another second output end or the first output end. When the optical channel is switched, both the strong light and the weak light are coupled into different channels. The sum of the energies at the first and second output ends and the sum of the energies at the first and second output ends after the switch are completed are always in a stable state, bringing stability to network transmission.

The application discloses a kind of GUI-based optical isolator parameter evaluation system and method.The system includes GUI interaction module (1), parameter input module (2), core calculation module (3) and result output module (4);The method of the application includes the following steps: S1, select evaluation mode by GUI interaction module (1), S2, by parameter input module (2) input light splitting / combination crystal parameters, optical rotatory crystal parameters, target operating wavelength λ And test temperature range t， S3, core calculation module (3) starts operation, S4, result output module (4) shows parameter value and IL-wavelength relationship curve, IL-temperature relationship curve, IS-wavelength relationship curve, IS-temperature relationship curve, and supports data export and performance evaluation.The application relates to the technical field of optical device detection, especially to an intelligent research and development design and data processing system based on industrial internet technology, which serves the optical communication and laser manufacturing industry.

This invention relates to a liquid crystal electrically controlled reflector capable of breaking the reflectivity limit, comprising, from front to back, a first liquid crystal device, a second liquid crystal device, a first reflective polarizer, and a second reflective polarizer. The main body of the first liquid crystal device is a first liquid crystal cell sandwiched with a first liquid crystal layer. The first liquid crystal layer is composed of negative liquid crystal doped with dichroic dyes. In its natural state, the negative liquid crystal molecules and the dichroic dye molecules are perpendicularly aligned, while in the driven state, the negative liquid crystal molecules drive the dichroic dye molecules to deflect along a second axis. The second liquid crystal device has a 90° optical rotation function in its natural state, but no optical rotation function in the driven state. This invention not only achieves efficient reflection of two beams of orthogonally polarized states simultaneously in its high-reflectivity operating mode, significantly improving the overall reflectivity, but also reduces the reflectivity to a minimum level in its low-reflectivity operating mode.

The present application relates to a kind of liquid crystal electrically controlled mirrors, including the absorption polarizer, first liquid crystal device, first reflective polarizer, second liquid crystal device, second reflective polarizer arranged in order from front to back;Define first axial, second axial as two axial parallel to mirror surface and mutually orthogonal, absorption polarizer has first transmittance T1 to first axial polarized light, and second transmittance T2 to second axial polarized light, T2 <T1;First liquid crystal device, second liquid crystal device have 90 ° optical rotation function in natural state, and no optical rotation function in the state of applying driving voltage;First reflective polarizer, second reflective polarizer can transmit first axial polarized light and reflect second axial polarized light.This kind of liquid crystal electrically controlled mirror not only can have higher reflectivity in high reflection state operating mode, but also can improve overall transmittance in its low reflection state operating mode.

The embodiment of the invention provides an isolator, an optical module and an optical communication system, relates to the technical field of optics, and is used for realizing a multi-core bidirectional isolator. The isolator comprises a first light splitting part, a deflection part, a light rotation part and a second light splitting part which are sequentially arranged in the optical axis direction. The deflection component comprises a first area and a second area which are different in polarization direction. In a first scene, the first light splitting component receives a first light beam, splits the first light beam, and emits the split light beam to a first area of the deflection component; the second light splitting component receives the second light beam, splits the second light beam, and emits the split light beam to the second area of the deflection component. Light is transmitted to the deflection component after being split by the first light splitting component, and the light after being split is transmitted to the second light splitting component after being deflected in polarization direction by the deflection component and the optical rotation component in sequence, and is emitted after being transmitted by the second light splitting component.

The present application relates to the technical field of atomic magnetometer, and particularly relates to a laser frequency stability control method of NMOR atomic magnetometer based on optical rotation signal, which comprises the following steps: irradiating an atomic cell with linearly polarized laser to pump atoms and detecting optical rotation signal; once demodulating the optical rotation signal to obtain magnetic resonance signal; applying a fixed frequency modulation signal to the laser frequency; twice demodulating the magnetic resonance signal to obtain a demodulation signal corresponding to the laser frequency offset; and feeding back and adjusting the laser frequency according to the demodulation signal. The present application is used to reduce the influence of laser frequency drift on the magnetic resonance signal of NMOR atomic magnetometer, improve the stability of long-term work of NMOR atomic magnetometer, and reduce the system volume and system complexity.

The invention discloses a magnetic circular dichroism spectrum and magnetic rotation dispersion simultaneous measurement method. Substituting test data of a magnetic circular dichroism spectrum and magnetic rotation dispersion simultaneous measurement device based on a time sequence polarization measurement method into a spectrograph CCD (Charge Coupled Device) receiving light relative intensity principle formula, establishing an equation set, and solving a normalized Stokes parameter average value of sample transmission light; and obtaining a test result according to the relationship between the magnetic circular dichroism and magnetic circular birefringence quantization parameters and the Stokes parameter. According to the test method disclosed by the invention, test results of two characteristics of the magnetic circular dichroism spectrum and the magnetic rotation dispersion of the material can be obtained in one test; the test principle is direct, the test method is simple, rapid and effective, the required device is relatively simple, the actual wave plate retardation function and the spectrometer polarization effect are considered, and a large amount of data is averaged; and the test result is idealized and high in accuracy. The test method is beneficial to integration of related test functions of the composite equipment, and is beneficial to popularization in the related scientific research and test technical field.

The present application discloses a polarization-maintaining quantum frequency conversion device and a wavelength conversion method, relating to the technical field of optical modulation. The device includes: a polarization beam splitting device, an optical rotation device, a first off-axis parabolic mirror coated with a metal reflection film, a nonlinear crystal, and a second off-axis parabolic mirror coated with a metal reflection film; the polarization beam splitting device is configured to separate a pump light and a signal light into a first light beam and a second light beam; the optical rotation device is configured to flip the polarization direction of the light beam; the first off-axis parabolic mirror is configured to couple the first light beam into the nonlinear crystal, and collimate the second light beam and the output light and then input them into the polarization beam splitting device; the second off-axis parabolic mirror is configured to couple the second light beam into the nonlinear crystal, and collimate the first light beam and the output light and then input them into the polarization beam splitting device; the nonlinear crystal is configured to perform a nonlinear transformation on the first light beam or the second light beam to generate an output light.