Abstract
Abstract. Imaging polarimetry can obtain two-dimensional intensity distribution information and its corresponding states of polarization from the target simultaneously. Sagnac polarization imaging interferometer is one of the typical channeled polarimetry technologies. By splitting the incident light through the triangular optical structure, the polarization information of the target is modulated into the interference fringes and can be obtained by the demodulation algorithm. The non-ideal optical elements in the system will cause reconstruction errors. This article analyses several factors that affect the measurement accuracy, including the splitting ratio of polarization beam splitter and the diffraction efficiency of the blazed grating. We derive the modified intensity formula and obtain interference patterns through numerical simulations. By calculating the modulation degree of interference fringes and reconstruction error under different non-ideal parameters, we have come to the conclusion that to meet the requirement of modulation degree > 0.5 and reconstruction error < 10%, the beam splitting ratio of the PBS should be α < 1.22. The diffraction efficiency ratio of s-polarization to p-polarization of the blazed grating should be ηs/ηp > 0.83, and the first-order diffraction efficiency should be η1 > 79%.
Highlights
Imaging polarimetry is developed to measure the two dimensional spatial distribution of intensity and strokes parameters of the target simultaneously (Tyo, 2006)
It can be seen from Eq (7) that when I1 and I2 are equal, the modulation degree of interference fringes is the highest
After the incident light is diffracted by the blazed grating, other orders of stray light will enter the system in addition to the first order, resulting in contrast reduction of the interference fringes
Summary
Imaging polarimetry is developed to measure the two dimensional spatial distribution of intensity and strokes parameters of the target simultaneously (Tyo, 2006). Simultaneous detection methods such as division of amplitude (DoAP) (Tu et al, 2017), division of aperture (DoA) (Pezzaniti and Chenault, 2005) , and division of FPA (DoF) (Gruev et al, 2010) were developed, which can acquire the Stokes parameters of the target in a snapshot. These methods usually require the use of polarization analysing optics, such as rotation polarizer, micro waveplate, lens array or micro polarizer array, resulting in complex system structure, difficult alignment, and registration error. The liner polarization information of the target can be solved from Eq (5)
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