Spatial modulation polarization detection method based on vortex wave plate

A technology of spatial modulation and detection method, applied in measurement devices, instruments, polarization influence characteristics, etc., can solve the problems of low light polarization detection accuracy, slow measurement and calibration speed, etc., and achieve real-time polarization detection and save calibration. time, the effect of improving stability

Pending Publication Date: 2022-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] In view of this, the present invention provides a spatially modulated polarization detection method based on a vortex wave plate, which can realize the detection of photon polarization state, photon polarization probability and Mueller matrix under strong / weak light fields, and solve the problem of existing spatial modulation The measurement and calibration speed of polarization detection technology is slow, and the problem of low precision of polarization detection in weak light

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  • Spatial modulation polarization detection method based on vortex wave plate
  • Spatial modulation polarization detection method based on vortex wave plate
  • Spatial modulation polarization detection method based on vortex wave plate

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Embodiment example

[0121] Step 1, the wave plate of the polarization state generator is composed of a polarizer and a multi-fast axis quarter-wave plate, and the multi-fast axis wave plate will simultaneously generate four linearly independent incident polarization states expressed as:

[0122] Step 2: After the incident light passes through the sample to be tested, the vortex quarter-wave plate and the polarization state analyzer, the joints of the multi-fast axis quarter-wave plate will divide the intensity distribution of the detection surface into four different shapes. Intensity map, the four intensity maps are processed separately. The data processing method is the process of solving the maximum polarization probability and polarization state as described above, and then solves the four polarization states emitted by the sample.

[0123] Step 3, the four polarization states of the incident sample and the corresponding four polarization states of the outgoing sample Bring into formul...

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Abstract

The invention discloses a spatial modulation polarization detection method based on a vortex wave plate, and the method comprises the steps: building the relation between the intensity distribution of a detection surface when any polarized light is incident and the intensity distribution of the detection surface when four special polarized light is incident, and obtaining the intensity distribution of the four detection surfaces through a built theoretical model, so as to achieve the processing of a system and the calibration of an alignment error. The calibration steps of the spatial modulation polarimeter are simplified, and the polarization detection efficiency is improved; a mixed gradient descent algorithm is provided to solve the maximum photon polarization probability, the method can realize high-precision and rapid polarization state and polarization probability detection, and the data processing efficiency of the spatial modulation polarimeter is improved; in combination with the Fourier low-pass filtering technology of threshold gating, the method provided by the invention can realize rapid and high-precision detection of the photon polarization state, the photon polarization probability and the Mueller matrix in the strong / weak light field through single shooting of the camera.

Description

technical field [0001] The invention belongs to the technical field of polarization measurement, and in particular relates to a spatially modulated polarization detection method based on a vortex wave plate. Background technique [0002] Polarization measurement is used to characterize the polarization state of the light beam. The interaction between light and the sample will change the polarization state of the incident light. The change of the polarization state of the light by the sample can be expressed by Stokes parameters. Stokes parameters can be divided into circular depolarization parameters and linear depolarization parameters. Polarization parameters that are closely related to the microstructure of the sample, have practical physical meaning, and can be quantified can be used to obtain the polarization characteristics and structural parameters of the sample. As an important tool for analyzing the polarization characteristics of light and samples, polarization mea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/21
CPCG01N21/21G01N2021/216
Inventor 李艳秋宁天磊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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