94 results about "Optical field" patented technology

An apparatus and method for realizing photon pair emission and fiber output on the basis of quantum dots. The apparatus comprises: a single quantum dot (1), which is used for generating cascaded luminescence of single excitons and biexcitons, wherein an exciton state exhibits luminescence in two polarization states, i.e. H and V, and the two polarization states have an energy splitting; a microcavity (2), which is formed by a first Bragg reflector (3) and a second Bragg reflector (4), and is used for controlling the directional light emission of the single quantum dot (1); an optical fiber coupling component (6), which is prepared by means of vertically bonding a single-mode optical fiber (5) and encapsulated by means of curing, and is used for collecting the cascaded luminescence of single excitons and biexcitons generated by the single quantum dot (1); a local electric field, which is generated by a single dopant atom (22) in an adjacent modulation-doped layer (21), and is used for tuning the single quantum dot (1), so as to reduce exciton energy splitting and tune an exciton wave function; a luminescence output module, which is used for performing fluorescence collection on the single quantum dot (1) and outputting the collected cascaded luminescence of single excitons and biexcitons in the form of a Gaussian optical field; and a photon pair correlation test unit (11), which is used for filtering the cascaded luminescence of single excitons and biexcitons, and testing polarization correlation on the basis of filtered single excitons and biexcitons.

The invention relates to a high-order transverse mode compression state preparation device based on optical parameter resonant cavity mode selection, and belongs to the technical field of quantum state light field generation. Fundamental frequency light and pump light output by the laser source generate a high-order transverse mode light field through the mode conversion module, and then the high-order transverse mode light field enters the optical parametric resonant cavity to be subjected to parametric down-conversion with the nonlinear crystal. The cavity length of the optical parametric resonant cavity is locked at the optimal pumping mode position corresponding to the high-order transverse mode compression state, so that resonance of an impurity mode in the optical parametric resonant cavity can be avoided, and the compression level of a high-order transverse mode light field is improved. Under injection of high-order transverse mode pump light, the pump mode is purified through the optical parametric resonant cavity of the annular structure, the compression level of a high-order transverse mode light field is enhanced, adjustment is easy, practicability is high, productization is easy, and wide application prospects are achieved in the fields of quantum space measurement, biological measurement, atomic force microscope detection and the like.

This invention relates to information technology. The purpose of this invention is to solve the problem of inaccurate measurement of time delay mismatch in current chaotic modular link systems. It provides a chaotic modular link delay testing system and method, the technical solution of which can be summarized as follows: A continuous laser is used as a test carrier, and this test carrier is split into two beams, one outputting to the chaotic modular link system under test; the other test carrier is mixed with the output of the chaotic decryption device of the chaotic modular link system under test at a 90° angle to achieve coherent detection with zero difference, obtaining a mixed optical field; the mixed optical field is then converted by photoelectric conversion to output a Q-component signal; the input Q-component signal is sampled at high speed, and a phase mismatch term is calculated; an autocorrelation operation is performed on the phase mismatch term to obtain a correlation curve; and the time delay corresponding to the second peak is calculated based on the correlation curve to obtain the measured time delay mismatch Δt. The beneficial effect of this invention is that it can quickly and accurately calculate the measured time delay mismatch Δt, and it is applicable to chaotic modular link systems.

The application relates to the technical field of optical communication, and particularly discloses a photon orbital angular momentum mode order multiple transformation device, which comprises an optical coordinate transformation module, an optical 4f low-pass filter module and a reflection module; the optical coordinate transformation module comprises a first phase part and a second phase part with an optical field phase modulation function; a vortex optical field carrying photon orbital angular momentum is emitted from the first phase part, the vortex optical field is transmitted to the reflection module after spiral decomposition and phase modulation of the first phase part, and then is transmitted to the second phase part; the second phase part changes the phase distribution from an angular spiral phase into an angular scaled spiral phase, and then outputs ideal vortex light through the optical 4f low-pass filter module; the photon orbital angular momentum mode order multiple transformation device realizes mode transformation of various multiples, greatly improves the efficiency of mode multiple transformation and the purity after change, and can be widely applied to the field of optical field regulation.

The invention relates to the technical field of micro-nano optics, in particular to a light field switching and characterization method and system. According to the light field switching and characterization method provided by the invention, rapid switching between a tightly focused light field and a surface plasmon polariton field can be realized through the process of moving the focus of the exciting light and controlling the focusing degree of the exciting light, and when parameters of incident light are changed, the switching device is still applicable and has relatively high reusability. According to the method, the optical retardation between pump light and exciting light is adjusted, so that the pump light and the exciting light are focused to the same position on a substrate at the same time, a partial degenerate four-wave mixing effect is generated, and nonlinear signal light is generated; and the non-linear signal light is represented through an imaging technology. The four-wave mixing effect is caused by a third-order nonlinear effect, and the effect almost occurs in all crystal materials. Therefore, the effect can be almost used for detecting the surface of any sample, and the reusability is high.

The invention provides a system and method for enhancing the spectrum demodulation rate of a dual-optical-frequency comb, and the system comprises a circulation light path which carries out the light splitting of excitation pulse light which is inputted to the circulation light path and corresponds to a first repetition frequency, thereby enabling one part of the excitation pulse light to be outputted towards a unit to be detected, and enabling the other part of the excitation pulse light to circulate along the circulation light path; the to-be-tested unit is used for modulating the excitation pulse light and outputting processing signal light carrying dynamic spectrum information generated based on an actual dynamic spectrum of the to-be-tested unit; the light combining unit is used for coupling the processing signal light and the sampling pulse light and outputting coupled signal light; the photoelectric detector performs light field cross-correlation-based detection on the coupled signal light and outputs a periodic electric signal; and the data acquisition and processing unit processes the periodic electric signal to obtain an actual dynamic spectrum corresponding to the unit to be detected. The detection efficiency is at least improved.

This invention discloses a tunable nanoantenna and its fabrication method, belonging to the field of nanoantenna technology. The tunable nanoantenna comprises, from top to bottom: an ordered metal mesh nanoelectrode layer, Fe... 3 O 4 The invention comprises a magnetic nanosphere layer, a silicon nanopillar micro / nanostructure layer, a substrate layer, and a lower electrode layer. This invention proposes a tunable nanoantenna and its fabrication method. Specifically, this invention combines silicon nanopillars with Fe... 3 O 4 By combining magnetic nanospheres and utilizing their synergistic effect, a composite nanoantenna with magnetic response and optical resonance characteristics can be constructed. This not only breaks through the limitations of single-material control, but also enables more flexible performance control through the dual effects of magnetic and optical fields.

The invention provides a light field quantum state regulation and control method and device based on solid higher harmonic generation conditions, and relates to the technical field of quantum optics. The laser wavelength of the driving laser and the harmonic order of the solid higher harmonic are controlled according to the control variable strategy, and higher harmonics of different quantum states are obtained; performing quantization conversion processing on higher harmonics of different quantum states to obtain a plurality of Wigner functions used for representing light field quantum state description; and performing function feature analysis on the Wigner function to obtain a light field quantum state regulation and control result including an optical modem state and a coherent state. The invention is used for solving the technical problem that the quantum state of the light field is difficult to directionally regulate and control by using the generation condition of the solid higher harmonic in the prior art.

The application discloses an acceleration measurement method and device based on optical suspended microparticle centroid motion quantum state, which utilizes optical tweezers to trap a four-level atom and a nanometer microparticle in an optical cavity simultaneously, the optical cavity is driven by driving laser LC, a stable cavity optical field, i.e., cavity mode, is excited and formed in the cavity; the cavity optical field is coupled with the internal energy level transition of the atom and the centroid motion of the nanometer microparticle simultaneously, and three control lasers LES, LER and LGR are used to drive three energy level transition processes of the atom; by controlling the three control lasers LES, LER and LGR, a rapid adiabatic process and an atomic state inversion process are realized; wherein, in the process of preparing the centroid motion of the nanometer microparticle to a target Fock state, the forward rapid adiabatic process and the atomic state inversion process are iteratively executed in sequence; in the acceleration measurement process, the reverse rapid adiabatic process, the atomic state inversion process and the population transfer process based on a pi pulse are comprehensively utilized. The application can further improve the measurement sensitivity.

According to the gallium nitride-based semiconductor laser with the gradually-changed polarized optical phonon energy waveguide layer, a fitting curve of In ion strength distribution or In atom concentration distribution of an upper waveguide layer and a lower waveguide layer is tested through SIMS, and a fitting curve of polarized optical phonon energy distribution meets any function distribution of Log3P1, Lop2P2 and Biphase. The spatial continuous regulation and control of the phonon energy of the optical field are realized, so that the LO phonon energy is continuously and gradually changed along the propagation direction, the phonon energy gradient is formed, the LO phonon scattering is improved, the inelastic scattering and energy relaxation of carriers and LO phonons are inhibited, the carrier transportation and phonon scattering are optimized, the service life of the carriers and the gain retention time are prolonged, and the optical field performance is improved. According to the invention, the threshold current density is reduced, the thermal stability of the laser is improved, the use power and the use temperature of the laser are improved, meanwhile, the phonon energy valley value is matched with the quantum well gain peak, the scattering loss is inhibited, additional scattering caused by phonon energy mutation is avoided, the light field limitation is enhanced, and the slope efficiency is improved.

This invention belongs to the field of optical computation and simulation technology, specifically a rotationally symmetric optical field modeling method based on FD-BPM in cylindrical coordinates. This invention uses Matlab as a platform to create models of optical elements, including setting the morphology, refractive index, wavelength, amplitude, and wavefront of the incident light field. Based on beam propagation and the finite difference method with boundary conditions, the near-field and far-field optical fields at arbitrary positions of the rotationally symmetric optical element are calculated. This method can obtain various optical information modulated by the optical element, including intensity and phase information at arbitrary positions in the near and far fields, thereby calculating transmittance, focusing efficiency, depth of focus, and focal spot size. This invention greatly improves the accuracy and computational efficiency of optical simulation, and can significantly shorten the development cycle and reduce experimental costs in the design and optimization of large-aperture, short-wavelength focusing optical elements.

The invention provides a gallium nitride-based semiconductor laser with a gradient radiation recombination coefficient waveguide layer, which is characterized in that a lower waveguide layer and an upper waveguide layer are respectively a gradient radiation recombination coefficient lower waveguide layer and a gradient radiation recombination coefficient upper waveguide layer; and a fitting curve of In ion strength distribution or In atom concentration distribution and a fitting curve of radiation recombination coefficient distribution of the waveguide layer on the gradient radiation recombination coefficient both meet any function distribution of GaussAmp, InvsPoly and Hill in an SIMS test. A fitting curve of In ion strength distribution or In atom concentration distribution and a fitting curve of radiation recombination coefficient distribution of the waveguide layer under the gradient radiation recombination coefficient both meet BiDoseResp function distribution in an SIMS test. According to the invention, carriers, quantum recombination and a light field are efficiently localized, the laser gain is improved, the carriers and the light field are efficiently localized in an active layer (quantum well), meanwhile, non-radiative recombination and absorption loss of a waveguide region are inhibited, and the threshold current, slope efficiency and reliability are further improved.

This invention discloses a method for enhancing the uranium separation efficiency of commercial iron powder using an external field, comprising: adding commercial iron powder to a reactor containing fluorine- and uranium-containing wastewater; applying an external weak magnetic field or magneto-optical coupling; and performing uranium separation treatment on the fluorine- and uranium-containing wastewater under continuous stirring. This invention magnetizes the commercial iron powder by introducing a weak magnetic field, thereby attracting Fe... 2+ Migration disrupts the passivation layer on the surface of iron powder, promoting the reaction of U(VI) with Fe. 0 The redox reaction simultaneously strengthens the affinity between the magnetized iron powder particles and the paramagnetic O2 molecules, leading to the formation of γ-FeOOH nanosheets with a high specific surface area on the iron powder surface. The γ-FeOOH surface is rich in oxygen-containing functional groups, which achieve U(VI) separation through the bonding of -OH groups with U(VI). This invention, based on a weak magnetic field, further improves the separation efficiency of commercial iron powder for U(VI) in fluoride- and uranium-containing wastewater by coupling with an optical field.

The invention relates to the technical field of electro-optical modulators, in particular to an inverted step capacitor load type traveling wave electrode lithium niobate electro-optical modulator which comprises a substrate, a buffer layer, an optical waveguide, a metal electrode, an isolation layer and a high-dielectric cladding. The metal electrode is an inverted step capacitance load type electrode which can effectively reduce electrical loss and obtain high bandwidth, the inverted step capacitance load type metal electrode enhances the effect on the optical waveguide and effectively improves the modulation efficiency on the aspect of photoelectric efficiency, and the high-dielectric cladding and the isolation layer change the electric field intensity distribution while reducing the optical loss, so that the modulation efficiency is improved. The electric field intensity in the waveguide is greatly improved, the overlapping between the electric field and the light field is enhanced, the modulation efficiency is further improved, the half-wave voltage length product of 0.99 V.cm is achieved under the light absorption loss of 0.25 dB / cm through the lithium niobate electro-optical modulator of the inverted-step capacitance load type traveling wave electrode, and important guiding significance is achieved for the design of the electro-optical modulator.

The application belongs to the technical field of sensor measurement, and discloses a spherical joint multi-degree-of-freedom attitude measurement system and method. The system comprises a magnetic field measurement module, an optical field measurement module and a calculation module, wherein: the magnetic field measurement module measures the change of the magnetic field when the moving end of the spherical joint moves relative to the fixed end; the optical field measurement module measures the change of the optical signal when the moving end of the spherical joint moves relative to the fixed end; and the calculation module is used for calculating the angle and the angular velocity of the moving end of the spherical joint relative to the fixed end at the current moment according to the change of the magnetic field measured by the magnetic field measurement module and the change of the optical signal measured by the optical field measurement module respectively, and then fusing the angle and the angular velocity at the current moment to obtain the angle of rotation of the moving end of the spherical joint relative to the fixed end at the next moment. Through the application, the advantages are complementary, and the precision and the robustness of the measurement system are improved.

The present application relates to the technical field of terahertz pulse generation of optoelectronics, and discloses a terahertz field generation method based on two-color field phase locking, comprising: through optical system building, using a beam expander to amplify the fringe spot in the optical path. The frequency map and phase map of the amplified spot are obtained, and the periodic frequency point is extracted. The phase change information of the periodic frequency point is analyzed, compared with the expected phase change threshold, and it is judged whether the position of the piezoelectric ceramic needs to be adjusted. If the phase change information is within the threshold range, it is determined that no adjustment is needed; otherwise, the position of the piezoelectric ceramic is adjusted and moved. Through accurate control of the phase of the optical field, the stability of the pulse is improved, the overall structure is simplified, and the cost of the terahertz magnetic field generation is reduced.

The invention belongs to the technical field of rotating speed measurement, aims to solve the problems that a tachometer in a traditional electromagnetic pulse principle form is easily interfered by strong electromagnetic interference and metal burrs, and a pulse intensity threshold value is interfered by empirical human factors, and discloses a tachometer based on optics and a measurement method thereof. The tachometer comprises a laser transmitter, an optical signal receiving device and a photoelectric signal conversion assembly, the optical signal receiving device and the photoelectric signal conversion assembly are connected through an optical fiber, the laser transmitter is arranged below the optical signal receiving device, and the laser transmitter is arranged towards a gear and continuously emits laser to the surface of the gear; according to the method, the tachometer is used for rotating speed measurement. The number of the concave and convex parts of the gear is judged through the optical signal assembly, the optical signal receiving device adopts black to shield stray light interference in other directions, off-field interference can be effectively restrained, and the uniqueness of an optical path can also solve interference hindered by irregular objects in an optical field.

This application relates to a multi-plane optical conversion device and its design method, comprising: a phase modulation component, an optical path reflection component, and a beam splitter component. The phase modulation component includes N phase planes, where N≥1. The optical path reflection component is disposed on the optical propagation path of the phase modulation component and located at the end of the optical propagation path of the phase planes. The beam splitter component is disposed at the beginning of the optical propagation path of the phase modulation component. The device is configured to form a folded optical path, such that incident light enters through the beam splitter component, passes through the phase modulation component along a first propagation direction to reach the optical path reflection component, is reflected by the optical path reflection component, passes through the phase modulation component again along a second propagation direction, and is output by the beam splitter component. Each phase plane has the same physical phase profile in both the first and second propagation directions. This invention reduces the actual number of stacked physical phase planes while achieving the same optical field modulation effect.

The invention discloses a photoacoustic sensing unit, an acoustic signal detection device and an acoustic signal detection method, and relates to the technical field of acoustic detection. The lower wrapping layer is arranged on the upper surface of the substrate, and a mounting groove is formed in the lower wrapping layer; the core layer is arranged in the mounting groove, the core layer comprises a straight waveguide and a circular waveguide, and a coupling distance is formed between the straight waveguide and the circular waveguide; the straight waveguide, the circular waveguide and the coupling space jointly form a light field regulation and control area; the exposed area covers the core layer and the lower wrapping layer, the exposed area comprises a groove, and the sensitive medium packaging layer is used for receiving sound pressure signals, generating corresponding deformation and transmitting the deformation to the core layer to cause the structure or state change of the light field regulation and control area, so that the effective refractive index of the circular waveguide is changed, and the sound pressure signal is generated. The change of the effective refractive index causes the drift of the harmonic peak wavelength, and the variation of the sound pressure signal is determined according to the displacement of the harmonic peak wavelength. The sensitivity of sound pressure detection is improved.

The invention discloses a closed growth method of a high-purity laser-damage-resistant fluoride crystal, and relates to the technical field of crystal growth. The preparation method comprises the following steps: treating fluoride powder with an HF solution, and performing F2 high-temperature roasting purification; growing crystals in a Bridgman furnace under the assistance of a uniform magnetic field with proper intensity; and finally, processing the crystal by using CF4 and O2 mixed gas plasma to eliminate crystal surface damage and form a fluorine-rich passivation layer. Heat convection in the melt can be inhibited through assistance of the magnetic field, the crystallization process is kept stable, the impurity content and dislocation density of the crystal can be effectively reduced, the laser damage resistance of the crystal is improved, and the method is suitable for the high-end optical field.

The present invention belongs to the technical field of magnetization field customization, and in particular provides a method for inducing a super-diffraction-limited magnetization field in any orientation. The present invention only utilizes the radiation field of a single magnetic dipole antenna and superimposes a first-order corresponding spatial spiral phase thereon, and then the analytical expression of the vector optical field at the pupil plane of an optical tight focusing system can be obtained reversely; the Deby vector diffraction integral theory is used to quantitatively evaluate the tight focusing field of the vector optical field, and based on the inverse Faraday effect, the characteristics of the target magnetization field induced by this tight focusing field in a magnetic material are evaluated; the method of the present invention does not require a complex optimization process, and constructs a purely transverse circularly polarized near-diffraction-limited optical focal spot and induces a super-diffraction-limited magnetization field with a specified spatial orientation. The optical focal field customized by this method and the induced magnetization field have broad application prospects in the fields of optical tweezers, optical processing, all-optical magnetic storage, etc.

A system for performing sympathetic laser cooling is provided. The system includes a confinement apparatus configured to confine an object crystal that includes a qubit object and a coolant object in a cooling area. The system further includes manipulation sources configured to generate first and second manipulation signals. When the first and second manipulation signals are applied to the coolant object, the first and second manipulation signals collectively drive a sideband transition of the coolant object between a first quantum state and a second quantum state that is characterized by a red effective detuning that corresponds to at least one motional mode frequency of the object crystal. The system further includes one or more beam path systems that provide the first and second manipulation signals to the cooling area and one of the first or second manipulation signal is provided as a spatially structured optical field within the cooling area.

The invention provides a coherent array structure light turbulence compensation method and system based on gradient back propagation, and the method comprises the steps: calculating the theoretical light intensity distribution of a defocus plane at a set distance after a focusing lens is focused through constructing a light field model of a coherent laser array under a turbulence-free condition; collecting observation light intensity distribution at a set distance after focusing of the focusing lens after transmission of the atmospheric turbulence; and constructing a loss function by using a mean square error between theoretical light intensity distribution and observation light intensity distribution, taking an array parameter as an optimization variable, calculating a gradient by using a gradient back propagation algorithm, and iteratively updating the array parameter. And the theoretical light intensity distribution and the loss value are calculated again after each update until convergence. And finally, subtracting the optimized array parameter from the initial array parameter to obtain a turbulence compensation parameter, and adjusting an array emission state according to the turbulence compensation parameter, thereby realizing effective compensation of wavefront distortion introduced by atmospheric turbulence. According to the invention, distortion is inverted through out-of-focus light intensity, the structure is simple, and the compensation efficiency is high.

The present invention discloses a method for designing a spectral regulation metasurface based on time-domain adjoint topology optimization, including: selecting an initial metasurface structure, and obtaining a first structural refractive index distribution according to a pixelated structure matrix; performing blurring processing and threshold filtering processing to obtain a second structural refractive index distribution; setting an incident source and a target plane to perform forward simulation to obtain forward electric field information and actual optical field time-domain information at the target plane; fitting to obtain ideal optical field time-domain information at the target plane according to the optical field time-domain information of the incident source; using the correlation between the actual optical field time-domain information and the ideal optical field time-domain information as an objective function, performing adjoint simulation to obtain adjoint electric field information; calculating the value of the objective function, calculating a gradient matrix according to the forward electric field information and the adjoint electric field information, and updating the pixelated structure matrix; repeating the above steps for iterative calculation until the value of the objective function converges, and obtaining a spectral regulation metasurface according to the finally updated pixelated structure matrix.

The invention discloses a mode regulation and control laser based on Feshbach-like resonance, and belongs to the technical field of laser. Comprising a multimode gain module, a saturable absorption module, a Feshbach resonance tuning module and an output module which are sequentially arranged along an optical path. The multimode gain module provides optical signal energy and generates a multimode optical field; the saturable absorption module forms a pulse signal; the Feshbach resonance tuning module adjusts the polarization state through a polarization control part, changes the reflectivity of different frequency components by using a frequency reflectivity curve tuning device, constructs a mode coupling channel and introduces similar Feshbach resonance; and the output module is used for exporting the regulated and controlled laser signal. The directional distribution of the gain among different modes is realized through Feshbach-like resonance, the output light field mode is regulated and controlled from the perspective of active gain design, the energy loss in the traditional light field modulation is avoided, the energy utilization rate is obviously improved, and the method is particularly suitable for high-power and multi-mode dynamic switching scenes, and can be applied to the fields of hyperfine processing, high-speed communication and the like.

The application discloses a light field-electric field coupling detection electrode and a preparation method and a detection device thereof. 10 The application discloses a light field-electric field coupling detection electrode and a preparation method and a detection device thereof. 10 The application discloses a light field-electric field coupling detection electrode and a preparation method and a detection device thereof. ‑1 The application discloses a light field-electric field coupling detection electrode and a preparation method and a detection device thereof. The Si / Ag / WO3 / Bi

The application discloses a point diffraction wavefront regulation device based on an integrated structure of a fiber taper probe and a superlens and an optical detection equipment, and relates to the technical field of optical field regulation and micro / nano fiber output wavefront. Based on the point diffraction wavefront characteristics of the probe tip and the wavefront regulation capability of the superlens, the micro-scale light spot after phase shaping is accurately projected to a specific area on the sample surface under the condition that the axial propagation distance is significantly larger than the characteristic scale of the probe tip, and the functions of local excitation, selective irradiation and optical field control under the condition of high spatial bunching are realized. Compared with the traditional point diffraction wavefront generation scheme using a pinhole, an aperture or a conventional fiber end face, the application has significant advantages in the phase consistency of the point diffraction wavefront, the energy utilization rate, the processing repeatability and the system integration degree, and provides a high-controllability device structure scheme for micro / nano-scale optical detection and optical field analysis.

The invention provides a light field multispectral temperature inversion system and method based on a physical information neural network, and the method comprises the steps: firstly constructing a deep learning network infrastructure, and employing a double-layer U-Net architecture to extract the radiation and spatial distribution characteristics of data; then designing a physical information embedding module, modularizing the Planck's law of radiation, and guiding the network to establish physical association between radiation information and temperature; then, light field multispectral radiation data are collected through experiments, the network is trained after data division and preprocessing are completed, and the mapping relation between radiation characteristics and temperature characteristics is established; and finally, migrating the trained network to actual test data to realize high-precision and rapid temperature inversion. The method has the advantage of processing complex data through deep learning and the constraint of a physical model, the precision and the calculation efficiency of light field multispectral temperature inversion are improved, and the applicability of the method in a high-temperature complex environment is enhanced.

To provide an optical transmission line monitoring device for highly accurately estimating the distribution of optical power.SOLUTION: A first compensation unit configured to compensate for a part of chromatic dispersion of an optical transmission line and a part of high-order chromatic dispersion with respect to an electric field signal indicating an optical electric field component of an optical signal digitally coherently received from the optical transmission line; The optical transmission device includes a nonlinear compensation unit that compensates for deterioration due to a nonlinear optical effect of an optical transmission path, a second compensation unit that compensates for a remaining portion of chromatic dispersion and a remaining portion of higher-order chromatic dispersion with respect to an electric field signal after compensation by the nonlinear compensation unit, a generation unit that generates a reference signal indicating a photoelectric field component of an optical signal at a transmission end of the optical transmission path based on the electric field signal, and an estimation unit that estimates a distribution of optical power based on a correlation between the electric field signal after compensation by the second compensation unit and the reference signal.SELECTED DRAWING: Figure 3

The invention discloses an IMU (Inertial Measurement Unit) light path structure based on a metasurface, which is characterized in that a light beam generated by a laser 1 is divided into three mutually vertical light beams under the action of a beam splitting metasurface 3, and then is converted into circularly polarized light and linearly polarized light through a polarization conversion beam splitting metasurface 4, and the circularly polarized light and the linearly polarized light are respectively used for pumping and detecting a nuclear magnetic resonance gyroscope 6. The beam splitting metasurface 3 is composed of polarization-insensitive cylindrical nanorods, and incident light is split and generates corresponding deflection in combination with the generalized Snell law. The polarization conversion beam splitting metasurface 4 is composed of a polarization-sensitive rectangular nano-column and a polarization-insensitive cylindrical nano-column, the rectangular nano-column is used for converting linearly polarized light into circularly polarized light, and the cylindrical nano-column keeps the linear polarization characteristic and achieves beam splitting and direction adjustment. According to the invention, single laser configuration is adopted, efficient light field regulation and control are realized based on the metasurface, the problem that a traditional IMU light path system depends on a plurality of lasers is avoided, the system size, complexity and energy consumption are reduced, the stability and the integration degree are improved, and the system is suitable for high-precision inertial navigation application.