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Channeled spectropolarimetry is a snapshot scheme for the full polarization spectra measurement. It has the advantages of static, compact, lightweight, and easy to implement. However, while the broadband polarization spectra can be precisely reconstructed using the regular methods, such as the method based on the Fourier transform, the reconstruction of narrowband polarization spectra always suffers from errors caused by the crosstalk among channels in the optical path difference domain. We present an efficient narrowband full polarization spectra reconstruction method for channeled spectropolarimetry. The line shape of the intensity spectrum is estimated by the envelop curve of the measured high frequency modulated spectrum. The full polarization spectra can be reconstructed by the least-square method under the assumption that polarization states change slowly with wavelength for narrowband polarization spectra. The feasibility of the reconstruction method has been verified by the simulation and experimental results. [ABSTRACT FROM AUTHOR]

The effect of the ratio of two retarders for the demodulation in the intensity modulation spectropolarimeter is proposed. The five-channel autocorrelation function is introduced for the first time, its forming conditions and the principle of spectrum reconstruction are analyzed. From the analysis of the spectropolarimeter based on the interference spectrometer, we can conclude that the spectral resolution of some Stokes parameters reconstructed by the five-channel interferogram is improved compared with the seven-channel interferogram. The simulation experiment of spectrum recovery of five-channel autocorrelation function is carried out. The simulation results are in good agreement with the theory, and the results show that the scheme of the five-channel is feasible, which provides a good theoretical basis and reference for the optimization design of the spectropolarimeter. [ABSTRACT FROM AUTHOR]