30 results about "Elliptical polarization" patented technology

The invention relates to the field of cable detection, and discloses a cable oil film uniformity detection system based on machine vision, and the system comprises an active photoelectric illumination module which is used for generating a modulation optical signal of which the polarization state changes under a preset time sequence, and projecting the modulation optical signal to the surface of a cable; the synchronous photoelectric sensing and conversion module is used for receiving the modulated optical signal reflected by the surface of the cable and synchronously converting the modulated optical signal into a first electrical signal flow and a second electrical signal flow; wherein the first electrical signal flow represents multi-spectral intensity information of the reflected modulated optical signal, and the second electrical signal flow represents multi-polarization intensity information of the reflected modulated optical signal. By utilizing the sensitivity difference of the thin film interference model and the elliptical polarization model to the optical parameter change of the oil product, the systematic measurement error caused by batch replacement of the oil product or temperature fluctuation can be actively corrected, and the accuracy and long-term stability of the detection result are improved.

The present invention provides a distance calculation device that can calculate distance information relating to the distance a workpiece travels. [Solution] The system comprises a light source 10 that emits light, a first optical system 20 that converts the light from the light source into elliptical polarization and emits it toward a workpiece W1 that is transparent and moving in a specific direction, a second optical system 30 that converts the light from the workpiece into linear polarization and emits it, and an optical sensor 40 that acquires optical information of the workpiece based on the light from the second optical system. The first optical system includes a first polarizing filter 22 that converts to linear polarization and a first waveplate 23 that converts the linear polarization from the first polarizing filter into elliptical polarization. The second optical system 30 includes a second waveplate 31 that converts the light from the workpiece and a second polarizing filter 32 that is placed between the second waveplate and the optical sensor 40 and converts the light from the second waveplate into linear polarization.

To provide an optical laminate including a liquid crystal alignment cured layer and suppressing peeling defects when peeling the alignment substrate. 【Solution means】The optical laminate according to an embodiment of the present invention has a polarizing plate including a polarizer, a retardation layer laminated on the polarizing plate via a first adhesive layer, and a substrate laminated on the retardation layer in a peelable manner; the retardation layer includes, in order from the polarizing plate side, a first liquid crystal alignment cured layer and a second liquid crystal alignment cured layer laminated on the first liquid crystal alignment cured layer via a second adhesive layer; the retardation layer as a whole has a circular polarization function or an elliptical polarization function, has a relationship of Re(450)<Re(550)<Re(650), and its Nz coefficient is 0.30 to 0.70; the substrate is an alignment substrate of the second liquid crystal alignment cured layer, and its tensile elastic modulus is 3000 N / mm 2 or more.

Embodiments of the present application relate to a three-dimensional spatial light source system and a corresponding light measurement device, wherein the three-dimensional spatial light source system comprises: a light source; and a plurality of light paths independent of each other and configured to be coupled to the light source independently; wherein the plurality of light paths further comprises an intermediate light path and a plurality of peripheral light paths arranged around the intermediate light path and capable of being output as secondary light sources. Thus, the three-dimensional spatial light source system of the present application only needs one light source to meet the multi-path light source requirement of an elliptical polarization measurement device, and has simple structure, convenient installation and maintenance.

The utility model provides a focal plane full polarization sensing device, including substrate, phase delay layer, polarization detection layer and CCD sensor, the phase delay layer and polarization detection layer are arranged on one side of substrate in proper order, the phase delay layer has a plurality of phase delay zone in array arrangement, and the CCD sensor is arranged in the phase delay zone. The phase delay area comprises 2x < 2 > pixel units in different fast axis directions, the polarization detection layer is in single horizontal orientation, and the phase delay layer and the polarization detection layer are combined to form an elliptical polarization array, so that the simultaneous detection of four elliptical polarized lights is realized. The manufacturing process of the focal plane splitting polarization sensing device based on the metal wire grating is simplified, the manufacturing cost is reduced, efficient polarization imaging of the infrared band can be achieved, and the multi-band compatibility of the device is improved.

A single-light-path atom magnetometer based on any polarization state light splitting metasurface cascade is characterized in that coherent light emitted by a laser passes through a first-stage metasurface to realize light beam splitting in an orthogonal elliptical polarization state, one beam of light in the beam splitting light enters a glass gas chamber for pumping and detection, and the other beam of light enters a photoelectric detector for pumping and detection; the second-stage metasurface is used for monitoring the output light power of the laser device and controlling stable output of the laser device through a control circuit, light emitted out of the glass gas chamber passes through the second-stage metasurface, beam splitting of orthogonal linear polarization components is achieved, the light enters the two photoelectric detectors respectively, and precise measurement of an external magnetic field is achieved through signal processing of a rear-end circuit. The atomic magnetometer has the advantages that complete precise control over pumping and detection in the atomic magnetometer is achieved through cascading of the light splitting metasurfaces which can be integrated and are in any polarization state, meanwhile, system configuration is simplified, and performance improvement and miniaturization are facilitated.

The invention discloses an electromagnetic ultrasonic surface wave multi-parameter synchronous detection sensor and a detection method, and the sensor comprises an electromagnetic ultrasonic surface wave excitation unit which is composed of a magnet group and a fold-back line type excitation ring. The two-dimensional component electromagnetic ultrasonic surface wave receiving unit consists of a magnet group, a vertical rectangular receiving coil and a horizontal runway type coil; the detection method comprises the following steps: the electromagnetic ultrasonic surface wave excitation unit excites an ultrasonic surface wave on the near surface of a detected object, and the ultrasonic surface wave generates an elliptically polarized wave with two-dimensional components of out-of-plane displacement and in-plane displacement and transmits the elliptically polarized wave forwards; a horizontal magnetic field and a vertical magnetic field are respectively cut below the two-dimensional component electromagnetic ultrasonic surface wave receiving unit and are respectively received by two coils of the receiving unit to form receiving signals of an out-of-plane component and an in-plane component; and the polarization coefficient, the wave velocity and the surface wave coefficient of the surface wave can be respectively obtained according to the two component signals and the distance between the excitation unit and the receiving unit, so that multi-parameter synchronous detection is realized.

The invention discloses a weak value amplification-based polarization-maintaining photonic crystal resonance angular velocity sensor and method, and relates to the technical field of optical fiber sensing, and the weak value amplification-based polarization-maintaining photonic crystal resonance angular velocity sensor comprises a light source module, a polarization control module, a polarization-maintaining photonic crystal fiber annular resonant cavity and an interference reading module. The light source module, the polarization control module, the polarization-maintaining photonic crystal fiber annular resonant cavity and the interference reading module are connected through optical fibers. The light source module is used for providing laser with stable polarization and narrow linewidth; the polarization control module is used for switching linear polarization, circular polarization and elliptical polarization and preparing a front selection state and a rear selection state for weak value amplification; the polarization-maintaining photonic crystal fiber annular resonant cavity is used for forming an angular velocity measurement optical signal; the interference reading module is used for obtaining interference fringes. By implementing the weak value amplification-based polarization-maintaining photonic crystal resonance angular velocity sensor and method provided by the invention, the measurement sensitivity and stability of weak angular velocity can be improved.

This invention relates to a multi-core elliptical polarization-maintaining optical fiber and its fabrication method. The optical fiber includes a common cladding and polarization-maintaining core regions distributed within the common cladding. The polarization-maintaining core regions are elliptical, and there are at least three elliptical polarization-maintaining core regions spaced apart circumferentially. This invention features a compact structure, low crosstalk, and facilitates the placement of more polarization-maintaining core regions within a limited fiber cross-section. This allows the elliptical multi-core polarization-maintaining optical fiber to achieve higher density and greater capacity, as well as better polarization-maintaining performance, through space-division multiplexing. The uniform circumferential spacing of each elliptical polarization-maintaining core region forms a corresponding co-orientation structure, which is beneficial for controlling the cladding roundness during fiber drawing and for controlling inter-core crosstalk. This invention simultaneously increases the effective length of the optical fiber and achieves polarization-maintaining performance, providing more transmission channels and stronger birefringence performance, and has broad application prospects in the miniaturization of fiber optic gyroscopes and devices.

Cross door waveguide polarizer based on phase compensation relates to the field of microwave and antenna. The existing waveguide polarizer can only realize the conversion between linear polarization and left or right circular polarization, and the reconfigurable polarizer scheme of left or right elliptical polarization and conversion with arbitrary axial ratio cannot be realized. The waveguide polarizer comprises a 4-way power divider, a +45° accelerated phase shifter and a -45° delay phase shifter. The input end of the 4-way power divider is a linear polarization feed point port, which is used for dividing the input linear polarization electromagnetic wave into four equal amplitude and two opposite phase electromagnetic waves. The +45° accelerated phase shifter and the -45° delay phase shifter are alternately integrated on the four paths of the 4-way power divider, which are used for phase compensation of the four equal amplitude electromagnetic signals respectively. The electromagnetic signals have a continuous 90° phase difference. The electromagnetic signals pass through the cross door junction to form electromagnetic waves in the left or right circular polarizer, and the low axial ratio is maintained in a wide frequency band. The waveguide polarizer is also suitable for satellite communication field.

The invention discloses a communication electromagnetic wave adjustable linear polarization-to-circular polarization spherical lens antenna, a manufacturing method thereof, a communication base station, a communication system and a communication method, and belongs to the technical field of electronic communication antennas. The antenna comprises a controllable polarization spherical lens and a linear polarization feed source. The feed source is used for emitting polarized electromagnetic waves of which the linear polarization direction and the main axis direction form an inclined angle to the sphere; the length of an axial baseband of the electromagnetic baseband unit is configured to be greater than that of a radial baseband, so that the electromagnetic wave refractive index in the main axis direction is greater than that in the radial direction; and when the feed source is located at the equator part of the moving track, the electromagnetic waves are emitted in a circular polarization manner after being regulated and controlled by the lens. When the feed source is located at the end part of the sphere of the moving track, the polarization direction of electromagnetic waves is not changed after passing through the lens; and when the feed source is located between the equator part and the end part of the sphere, the electromagnetic waves are emitted in an elliptical polarization manner after being regulated and controlled by the lens. And three functions of high-gain wide-angle scanning, broadband working and adjustable polarization state are realized.

The invention discloses a nematic liquid crystal multi-frequency orthogonal reconfigurable antenna array unit, which comprises a multi-frequency radiation patch structure, the multi-frequency radiation patch structure is composed of two nested patches, the two patches are respectively an outer low-frequency radiation patch and an inner high-frequency radiation patch, and electromagnetic isolation between the two patches is realized through an annular gap etched on a dielectric substrate; the regulation and control method comprises the following steps: keeping the amplitude of an input signal of a radio frequency port corresponding to any frequency band unchanged, continuously regulating a liquid crystal dielectric constant through direct-current bias voltage, and changing the resonance characteristic of the frequency band; signals with a 90-degree phase difference are injected into the two radio frequency ports through the orthogonal feed network, and required elliptical polarized waves are formed in a radiation field of the frequency band in combination with phase delay change generated by dielectric constant tuning; the technical contradictions that polarization states of an existing liquid crystal reconfigurable antenna are mutually coupled in a multi-frequency-band working mode, continuous and accurate adjustment of an orthogonal polarization switching mechanism is difficult to achieve, driving voltage is too high, and the structure is complex, so that the profile is increased, and the manufacturing cost is increased are solved.

Systems and devices for detection and generation of polarized light are described. The described devices can be configured to detect light with one or more polarization states including light having linear, circular and elliptical polarization states. One example polarization detector includes two or more wires positioned to receive incident light. A first wire includes either an n-doped or a p-doped semiconductor material, a second wire can be a metal wire or can include an n-doped or a p-doped semiconductor material. The wires are in contact with one another and form one or more depletion regions when reverse biased. A portion of the incident light with a polarization state that matches geometrical characteristics of the wires is absorbed, and a portion of light with a polarization state that does not match the geometrical characteristics of the wires is transmitted through the wires.

The invention relates to the technical field of chip testing, in particular to an electrical property testing method, system and device based on a chip. According to the method, an auxiliary excitation coil is deployed around a to-be-detected chip silicon through hole array to generate a compensation magnetic field, the compensation magnetic field and an eddy current magnetic field are superposed to form an elliptically polarized magnetic field, a magnetic field sensor captures a long axis direction to extract real phase information of an original current magnetic field, and phase offset is dynamically compensated based on the phase information. And outputting the reconstructed current waveform, and finally identifying the chip defect according to the reconstructed current waveform. According to the method, the compensation magnetic field is generated by deploying the auxiliary excitation coil, the magnetic field sensor, the dynamic eddy current transfer function model and the like are combined, the current waveform is reconstructed to identify the defects, and high-precision detection and positioning of the defects such as chip micro short circuit are achieved.

This invention relates to the field of antenna technology, and in particular to an antenna system and electronic device, comprising an antenna element and a radome. The radome is located on the path of the antenna element's transmitted or received linearly polarized wave, and there is a rotational travel between the radome and the antenna element. A metal patch is disposed on the radome, which is used to change the electric field of the antenna element during at least a portion of the rotational travel. By rotating the radome, this invention allows for the switching and adjustment of the signal wave between linearly polarized, elliptically polarized, and circularly polarized waves according to usage requirements, achieving flexible adjustment of the signal processed by the antenna system. Furthermore, the structure is simple. Compared to existing circularly polarized antennas, it not only achieves stepless switching control of antenna polarization but also eliminates complex structures such as feed networks and multiple structural units, simplifying the system structure, reducing manufacturing difficulty and cost, improving the space utilization of the antenna system, and enabling miniaturized antenna system design.

The invention provides an on-line monitoring method and an on-line monitoring system for ion implantation. The on-line monitoring method for ion implantation comprises the following steps: constructing a plurality of single-factor models between the thickness of an amorphous layer formed on the surface of a sample substrate after ion implantation is carried out on the sample substrate and each process condition of corresponding ion implantation; a to-be-measured substrate after ion implantation is provided, an amorphous layer is formed on the surface of the to-be-measured substrate, and the thickness of the amorphous layer of the to-be-measured substrate is measured by adopting an elliptical polarization spectrometry method; and by using the thickness of the amorphous layer of the to-be-measured substrate, according to the single-factor model, obtaining process conditions for performing ion implantation on the to-be-measured substrate. According to the method, the thickness of the amorphous layer of the substrate after ion implantation and the corresponding single-factor model are obtained through the elliptical polarization spectrometry, and therefore high-speed, low-cost and full-dose-range online monitoring can be achieved on all technological conditions of ion implantation.

It is provided of a communication system capable of suppressing a fluctuation in a reception power of a known signal from a base station due to an attitude change of a radio relay apparatus, and performing an appropriate gain control of a power amplifier of the radio relay apparatus based on the reception power of the known signal, in case that the base station uses a plurality of linear polarization antennas for wireless communication with the radio relay apparatus. The base station comprises an antenna apparatus that has a plurality of linear polarization antennas capable of transmitting and receiving radio waves with different angles of linear polarization planes from each other when performing a feeder-link communication with the radio relay apparatus, and a base-station processing section or an externally-attached phase control apparatus for controlling a phase difference between plural transmission signals supplied to the plurality of the linear polarization antennas, so that a combined polarization of radio waves of the known signal transmitted from the antenna apparatus to the radio relay apparatus becomes a circular polarization or an elliptical polarization, with respect to a predetermined time slot for transmitting to the radio relay apparatus a specific known signal usable for gain control of a power amplifier of the radio relay apparatus.

The application discloses a spin terahertz emitter with adjustable polarization without an external magnetic field and a manufacturing method thereof. A metal thin film layer heterostructure is deposited on a surface of a glass substrate. A ferromagnetic layer is a FeNi thin film layer, an anti-ferromagnetic layer is an IrMn3 thin film layer, and an interface between the FeNi thin film layer and the IrMn3 thin film layer is an exchange coupling interface subjected to directional magnetic field induction treatment. A surface of the metal thin film layer heterostructure is a periodic stripe array structure. The manufacturing method comprises the following steps: a magnetron sputtering process is used to sequentially deposit a ferromagnetic layer, an anti-ferromagnetic layer and a protective layer; the exchange coupling interface is formed through directional magnetic field induction treatment; and a micro-nano processing process is used for patterning treatment. Beneficial effects are as follows: under the condition of no external magnetic field, reliable spin current generation, spin-charge conversion and terahertz radiation can be realized. The stripe patterning structure realizes linear polarization, elliptical polarization and near-circular polarization output. The 'zero-field emission function' and the 'polarization control function' are integrated in the same thin film device system, and the system complexity is reduced.

This invention relates to a high birefringence multi-core elliptical polarization-maintaining fiber and its fabrication method. The fiber includes a common cladding and stress regions and polarization-maintaining core regions distributed within the common cladding. There are at least three stress regions, evenly spaced circumferentially. The center lines connecting adjacent stress regions form a regular polygon. An elliptical polarization-maintaining core is positioned at the midpoint of each side of the regular polygon. The major axis of each elliptical polarization-maintaining core is aligned with the corresponding side of the regular polygon. Each elliptical polarization-maintaining core is configured with two adjacent stress regions to form a polarization-maintaining core region. This invention, by designing multiple elliptical cores and adding stress bars, provides more transmission channels, exhibits stronger birefringence performance, and reduces fabrication process requirements. The arrangement of shared stress regions forms multiple independent channels with a compact structure and low crosstalk, achieving higher density and greater capacity in multi-core polarization-maintaining fibers, and has broad application prospects in the miniaturization of fiber optic gyroscopes and devices.

The invention discloses a failure detection method and a regulation and control system for corrosion inhibition treatment of a silver alloy sheet-shaped electric contact chip. The failure detection method comprises the following steps: S1, acquiring the thickness of an organic protective film on the surface of the electric contact chip as dorg and the thickness of an oxide film as dox in real time through an elliptical polarization spectrum; s2, inputting the thickness dorg of the organic protective film or the thickness dox of the oxide film into a preset film thickness-contact resistance correlation model, and outputting to obtain a predicted contact resistance value Rc; s3, when the predicted contact resistance Rc is less than or equal to 25 m omega, judging that the electric contact piece is qualified, and when the predicted contact resistance Rcgt is obtained; and when the voltage is 25 m omega, judging that the electric contact piece is invalid, triggering a back-end processing flow, and returning to a front-end cleaning procedure. According to the method, the dynamic change effect of the predicted contact resistance value Rc is utilized to judge the failure condition of the electric contact chip in the front-end cleaning process, the bad reasons of the cleaning tank are checked in time, and the timeliness and reliability of failure detection of the electric contact chip are improved.

The invention discloses a bottom-supported ocean controllable source electromagnetic data batch processing method, which comprises the following steps: carrying out integrity check and time / frequency sequence preview on recorder data, emission source data and navigation data to obtain key data information; converting the time domain observation data into a frequency domain; performing normalization and correction on the observation data; rotating the electromagnetic field vector to the main axis direction of the elliptical polarization field; performing time window superposition processing on the corrected and rotated data, and synchronously estimating a data error; filtering the navigation data; projecting the filtered navigation data to a preset 2D profile orientation through coordinate rotation; time sequences of the navigation data and the electromagnetic acquisition data are aligned through interpolation, the transceiving distance of each time point is calculated, and an amplitude-transceiving distance curve and a phase-transceiving distance curve for inversion are generated. According to the method, the normalized electromagnetic field spectrum response which can be used for underground resistivity inversion can be efficiently and accurately extracted from the original time sequence data.

Presented herein are methods and systems for performing spectral elliptical polarization measurements of semiconductor structures with a collection NA resolved at a detector. The collection NA defines a small measurement cartridge size. The NA is distinguished and collected at the detector, so that the measurement sensitivity is remarkably improved. In some examples, the collection NA is subdivided into 50 to 100 sub-ranges at the detector. In some embodiments, a spectral ellipsometer employing angle resolved detection of collected NAs includes a coherent illumination source having a high spectral intensity across a wavelength range from 400 nanometers to 2,500 nanometers. In some embodiments, an illumination beam is scanned over a surface of a sample being measured at a high frequency during measurement. Spectral elliptical polarization measurements with detector-resolved collected NAs enable critical dimension, shape and profile measurements as well as film measurements of deep structures fabricated according to current semiconductor fabrication nodes, as well as those considered to be fabricated at future semiconductor fabrication nodes.

The invention discloses a Tamm plasmon-based phase singular point high-sensitivity optical sensor, which calculates a phase ellipsometric angle and an elliptical polarization angle by measuring reflection coefficients of transverse electric waves and transverse magnetic waves, and realizes high-sensitivity detection of the refractive index of an object to be detected. Comprising a dielectric main body, the dielectric main body comprises a metal layer on the left side and two dielectric layers periodically stacked on the right side, the metal layer on the left side is made of silver, crystalline silicon layers and to-be-detected object layers are alternately arranged on the right side, a classic metal and photonic crystal structure is formed on the overall arrangement, and Tamm plasmons can be effectively excited. The Tamm plasmon effect formed in the invention can generate separation of transverse electric waves and transverse magnetic waves, and through structural optimization, zero reflection points are generated during incidence of the transverse magnetic waves, and at the moment, phase characteristics of the electromagnetic waves are uncertain, and severe jump occurs. By means of the phase jump characteristic, the refractive index of the object to be measured is sensed, and the sensitivity reaches the order of magnitude of ten-fifth power.

The invention discloses an ocean controllable source electromagnetic acquisition station position correction method based on near-field symmetry. The method comprises the following steps: acquiring an initial position coordinate of a target receiving station, ocean controllable source electromagnetic actual measurement time sequence data, and real-time space coordinate and azimuth angle data of an emission source; preprocessing the time sequence data, and calculating the maximum amplitude of the elliptical polarization field in the main axis direction; screening out near-field data of which the transmitting-receiving distance between an emission source and a receiving station is smaller than a set threshold value from all data; searching a data pair in which the emission sources pass through the opposite directions of the two sides of the receiving station, the distances from the receiving station are approximate, and the absolute value of the azimuth angle difference between the two emission source positions is smaller than a set angle threshold; establishing an optimization objective function according to the data pair; and performing minimization solution on the target function by adopting a nonlinear least square algorithm to obtain an optimal position. The physical principle that an electromagnetic field in a near-field region should be strictly symmetrical about the position of the receiving station is utilized, and the real horizontal position of the receiving station is automatically optimized through an optimization algorithm.

The invention discloses an ultrahigh frequency RFID reader-writer all-in-one machine in a self-adaptive polarization mode and a control method, and relates to the technical field of ultrahigh frequency RFID reader-writers, and a main control module of an ultrahigh frequency RFID reader-writer all-in-one machine body comprises an environment sensor array, a dynamic load balancing algorithm module and a self-adaptive polarization adjustment execution unit. By dynamically adjusting the phase difference and the amplitude ratio of the dual-polarized antenna, the system can generate elliptically polarized waves or circularly polarized waves in real time, and multipath interference caused by metal surface reflection is effectively inhibited. Through the three-in-one design of hardware, an algorithm and a scene, the problem of pain points of traditional ultrahigh frequency RFID in a complex environment is solved, polarization mode dynamic switching is adopted to solve metal interference, and a three-dimensional parameter compensation mechanism is adopted to solve the influence of environmental fluctuation. Polarization space-time processing in the radar field is combined with the requirements of the Internet of Things to form a sensing, decision-making and execution closed loop, and a more stable solution is provided for a high-density and high-dynamic scene.

To provide an optical laminate including a liquid crystal alignment cured layer and capable of suppressing specific display unevenness when applied to an image display apparatus.SOLUTION: An optical laminate according to an embodiment of the present invention includes a polarizing plate including a polarizer, and a retardation layer laminated on the polarizing plate via a first adhesive layer. The retardation layer includes, in order from the polarizing plate side, a first liquid crystal alignment cured layer and a second liquid crystal alignment cured layer laminated on the first liquid crystal alignment cured layer via a second adhesive layer. The retardation layer as a whole has a circular polarization function or an elliptical polarization function and satisfies the relationship of Re(450)<Re(550)<Re(650). The thickness of at least one of the first adhesive layer and the second adhesive layer is 300 nm or less.SELECTED DRAWING: Figure 1

The application provides an antenna system and a control method and device thereof, an electronic device and a readable storage medium, wherein the antenna system comprises: an antenna assembly, the antenna assembly comprising a first antenna arm, a second antenna arm and a third antenna arm, the first antenna arm and the second antenna arm being perpendicular, the first antenna arm and the third antenna arm being perpendicular, and the second antenna arm and the third antenna arm being perpendicular; and a phase shift assembly, the phase shift assembly comprising at least two phase shifters, at least two of the first antenna arm, the second antenna arm and the third antenna arm being connected to different phase shifters respectively, so that the first antenna arm and the second antenna arm form circularly polarized radiation or elliptically polarized radiation when working, the first antenna arm and the third antenna arm form circularly polarized radiation or elliptically polarized radiation when working, and the second antenna arm and the third antenna arm form circularly polarized radiation or elliptically polarized radiation when working.

The utility model provides an auxiliary device for film thickness measurement by an elliptical polarization method and a film thickness measurement device. The auxiliary device comprises a bearing piece, a laser, an X-ray generator, a positioning mechanism, a signal collection module and an energy analysis module. The auxiliary device for measuring the film thickness by the elliptical polarization method can be combined with a conventional elliptical polarization spectrometer, and the X-ray generator, the signal collection module, the energy analysis module and other components are additionally arranged on the sample table, so that an additional photoelectron spectrum signal analysis function is realized; meanwhile, a mechanism related to loading and moving of a to-be-detected workpiece is improved, the to-be-detected workpiece is driven by a moving platform, the to-be-detected workpiece is positioned near the converging position of a laser beam and an X-ray beam, and whether a target film layer is damaged or not can be distinguished based on reaction signals before and after laser irradiation; the auxiliary device is compatible with existing semiconductor production equipment and a production platform, large-scale transformation of an existing production line is not needed, and the production detection cost can be effectively saved.

The present application relates to the technical field of fiber laser, particularly relates to a kind of full optical fiber integrated polarization adjustable control narrow line width laser, the device includes semiconductor pump source, active pi phase shift fiber grating, polarization maintaining isolator, polarization maintaining polarization beam splitter, power equalization unit, phase modulator and polarization maintaining polarization combiner.The present application utilizes the single longitudinal mode orthogonal dual polarization light field generated by active resonant cavity as base, and separates it into two paths;Through power equalization unit, the light energy of two paths is consistent, and the phase difference of two light is regulated using phase modulator, and finally coherent superposition output is output.The present application realizes stable continuous regulation between laser on-line polarization, circular polarization and elliptical polarization state, adopts full optical fiber structure, is strong against interference, and is suitable for communication and sensing field.

A method includes illuminating a target and collecting light scattered from the illuminated target. The collected light scattered from the illuminated target has an elliptical polarization that varies spatially across a collection pupil. The method also includes converting the polarization of the collected light from the elliptical polarization that varies spatially across the collection pupil to a linear polarization that is uniformly oriented across the collection pupil, using one or more single-material gratings. The one or more single-material gratings have phase retardation that varies spatially across the collection pupil in accordance with the elliptical polarization. The method further includes filtering out the light having the linear polarization that is uniformly oriented across the collection pupil, using a linear polarizer.