研究目的
To develop a modified Sagnac imaging spectropolarimeter for acquiring full linear Stokes parameters in snapshot mode, eliminating aliasing effects, and enhancing detectability in fields like remote sensing and spatial exploration.
研究成果
The modified Sagnac imaging spectropolarimeter successfully modulates and demodulates full linear Stokes parameters in snapshot mode, with good agreement in simulations. The novel method for detecting polarization parameters helps eliminate aliasing effects. Future work should focus on optimal design, reconstruction techniques, and developing a working prototype to address noise and sampling limitations.
研究不足
The simulation did not account for noise, which could cause deviations, especially at interferogram edges. Errors arise from discrete sampling of interferograms, leading to inaccuracies in polarization detection. The system is currently conceptual and requires prototyping and optimization for real-world applications.
1：Experimental Design and Method Selection:
The system integrates a spectral-polarimetric modulator with a modified Sagnac interferometer to modulate Stokes components into wave numbers and capture interferograms in snapshot mode. Theoretical models based on Muller matrices and trigonometric functions are used for modulation and demodulation.
2：Sample Selection and Data Sources:
Simulations use input light with defined Stokes vectors (e.g., natural light and partial polarized light) to generate spectra and interferograms.
3：List of Experimental Equipment and Materials:
Includes a fore-telescopic system, field diaphragm, collimated lens, spectral polarization modulator (with retarders R1 and R2, linear polarizer P), modified Sagnac interferometer with large optical path difference, imaging lens, and CCD camera.
4：Experimental Procedures and Operational Workflow:
Light passes through the optical setup, is modulated, interfered in the Sagnac interferometer, and captured as interferograms on the CCD. Simulations involve rotating the polarizer to different angles (0°, ±45°, 90°) for multiple measurements.
5：Data Analysis Methods:
Interferograms are analyzed using phase correction techniques (e.g., square-root phase correction) to separate and demodulate Stokes spectra. Polarization parameters are calculated from gray values of CCD pixels.
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