9 results about "Polarized spectroscopy" patented technology

This application relates to the field of optical polarization measurement technology, specifically to a wide-spectrum, high-bandwidth static spectral modulation Stokes polarization measurement device, comprising a polarization modulation module, a spectral sampling module, and a high extinction ratio polarizer. The polarization modulation module includes a phase retarder and a linear polarizer; the spectral sampling module has sub-nanometer spectral resolution; the high extinction ratio polarizer includes a halogen tungsten lamp and a Glan Taylor prism for generating high-purity linearly polarized light; the obtained demodulation factor and the modulation spectrum acquired by the spectral sampling module are used to invert the Stokes parameters using zero-heterodyne coherent demodulation technology. This application employs a phase retarder with high birefringence, which, for the same thickness, produces an optical path difference tens of times greater than that of quartz, increasing the Stokes polarization measurement bandwidth by a factor of the response and improving the measurement accuracy of polarization spectral parameters. Simultaneously, the zero-heterodyne coherent demodulation method is used to eliminate the dispersion interference of the phase retarder through calibration.

This invention discloses an experimental method for measuring the electron-hole recombination emission rate. The apparatus for this method includes a laser chip (with an anti-reflection coating on only one end of its horizontal two-sided end face), a plano-convex lens, a polarizer, a fiber optic coupler, an optical fiber, and a spectrometer. The plano-convex lens, polarizer, plano-convex lens, and fiber optic coupler are placed sequentially on the same horizontal line on both sides of the chip. The fiber optic coupler is connected to the spectrometer via an optical fiber. First, energy is applied to the laser chip, causing it to emit light from both sides. The spectra from both sides are focused onto the fiber optic coupler by the plano-convex lens and then transmitted to the spectrometer via the optical fiber. By rotating the polarizer, different polarization spectra can be selected to obtain specific spectral images under transverse electric / magnetic field modes. Finally, by substituting the spectral data from both ends into the established formula, the electron-hole recombination rate of the laser chip can be calculated.

This invention provides a single-stage hyperspectral image dehazing and reconstruction method based on joint polarization spectral priors, comprising the following steps: Step 1, haze imaging modeling; Step 2, acquiring joint polarization spectral compressed observation data; Step 3, constructing a single-stage polarization spectral reconstruction neural network; Step 4, network training and optimization. The integrated reconstruction architecture proposed in this invention effectively overcomes the limitations of traditional "two-stage" methods. By directly establishing an end-to-end mapping from compressed observations to clear hyperspectral images, it avoids the cumbersome computational steps involved in dehazing followed by reconstruction (or vice versa), significantly improving inference efficiency.

This invention discloses a microfluidic-based polypeptide-based helical fiber with circularly polarized luminescence and its preparation method, belonging to the field of nanotechnology. Utilizing multiple hydrogen bonding interactions between polypeptides and based on the solute conformational confinement and ordered solvent diffusion mechanism of a microfluidic laminar flow chip, this invention develops a polypeptide-based circularly polarized luminescent material with excellent luminescence performance. Circular dichroism spectroscopy and circular polarization spectroscopy tests show that the helical fiber material obtained by this invention exhibits mirror-symmetric signals. Compared with materials obtained by traditional solution stirring, the polypeptide-based helical fibers prepared in the microfluidic chip by this invention not only have a more uniform morphology but also a larger... g lum value( L -Peptide / TBI and D The luminescence asymmetry factor of -Peptide / TBI is ±1.9×10⁻⁶. ‑3 Furthermore, this method has a certain degree of universality and is applicable to the assembly of other macromolecules, including polymers, nucleic acids, and proteins.

This invention discloses a system and method for flyby detection of asteroid hyperspectral polarization characteristics, belonging to the field of optical detection technology. The system comprises an orthogonal mirror module, a polarization spectral modulation module, a front imaging lens, a microlens array, a collimating lens, a spectral dispersive element, a focusing lens, an image detector, and a data processing unit. The detection system uses the orthogonal mirror module to enable a satellite platform to track and stare at the asteroid during high-speed flyby. It also introduces a microlens array to replace the slit in a traditional imaging spectrometer, and, combined with the polarization spectral modulation module, simultaneously acquires a two-dimensional image, hyperspectral, and polarization information of the target asteroid in a single measurement. This invention achieves multi-angle hyperspectral polarization snapshot imaging detection of asteroids during high-speed flyby.

The application provides a star-borne multi-view polarization spectrum imaging system for aerosol optical parameter measurement, and belongs to the technical field of optical imaging. The system is carried on a satellite platform, and comprises a telescope objective, a multi-slit assembly, a light-splitting prism, a collimating lens group, a plane grating group, an imaging lens group, a depolarization light-splitting prism group, a polaroid group and a detector group. The system is based on static multi-view synchronous observation design, and realizes high-precision detection of aerosol optical parameters through multi-view, hyperspectrum and full-polarization multi-dimensional information fusion.

The application discloses a kind of based on polarization spectrum unfrozen water content prediction method and system, medium, terminal, it is related to soil detection technical field, main purpose is in to improve the problem of the prediction accuracy reduction of unfrozen water content prediction model based on reflectivity construction caused by the change of soil surface reflection characteristic in the ice crystal structure formation process.It includes: collecting the multi-angle polarization spectrum of the soil sample to be measured at the target temperature, and carrying out decomposition processing to obtain a set of polarization component spectrum;Determine the target freeze-thaw stage based on the target temperature;Based on the stage input feature subset corresponding to the target freeze-thaw stage, generate target input feature combination;Based on the stage unfrozen water content prediction model matched with the target freeze-thaw stage, generate the predicted unfrozen water content according to the target input feature combination.

The application discloses a kind of diffractive metasurface full stokes polarimetric spectrum detection system and method, belong to micro-nano optics and polarimetric spectrum detection technical field, the technical problem to be solved is the detection and reconstruction of polarimetric spectrum information, technical solution points are: optical coding module includes diffractive metasurface, the diffractive metasurface includes nanometer column arranged according to preset rule, for polarized multiplexing phase modulation and spectral dispersion coding to incident light, different polarization state and wavelength incident light information is converted into spatial diffraction distribution;Photoelectric conversion module is located on the diffraction light path of the diffractive metasurface, for single exposure recording the diffraction distribution, generates two-dimensional original intensity image;Information recovery module is connected with the photoelectric conversion module, built-in pre-trained deep learning model, for the full stokes polarimetric spectrum information of incident light in the two-dimensional original intensity image is decoupled and recovered.

This invention relates to a terahertz time-domain ellipsometric spectrometer based on optical asynchronous sampling, comprising: a pump laser for generating a first femtosecond pulse to excite a terahertz transmitting antenna to emit terahertz light; an incident arm assembly for converting the terahertz light into an incident beam that meets the requirements of ellipsometric measurement and illuminating the surface of the sample under test at a preset incident angle; an exit arm assembly for collecting reflected terahertz light carrying information about the sample under test and focusing the desired polarization component light selected from the reflected terahertz light onto a terahertz receiving antenna; a probe laser for generating a second femtosecond pulse to trigger the terahertz receiving antenna to generate a photocurrent; and a signal processing module for amplifying the photocurrent and converting it into a voltage signal for sampling; wherein the pump laser and the probe laser are locked by an electronic phase-locked loop to maintain a stable repetition frequency difference. This invention enables high-speed, high signal-to-noise ratio, and high-stability full polarization spectral measurement.