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False signature reduction in channeled spectropolarimetry

机译:通道光谱法中虚假信号的减少

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摘要

Channeled spectropolarimetry measures the complete polarization state of light, using a single spectrum, by amplitude modulating the Stokes parameters onto spectral carrier frequencies. However, spectral features that are not band limited in the Fourier transform domain, such as narrow-band atomic absorption lines, can generate false polari-metric signatures. We present a false-signature (aliasing) reduction technique that reduces the error induced by these non-band-limited features. Additionally, the spectral resolution of the S_o Stokes parameter is improved, up to the maximum resolution offered by the spectrometer. A theoretical model for implementing the technique on a Fourier transform infrared spectrometer is presented, including an enhanced model that accounts for dichroism within the crystal. The approach is experimentally demonstrated in the middle-wavelength infrared (3-5 μm) with the use of two multiple-order yttrium vanadate retarders. Additional results demonstrating the technique for wavelengths spanning 2.5-15 μm are obtained using cadmium sulfide retarders. Reconstructions are compared to conventional channeled spectropolarimetric reconstructions from the same system.
机译:通道光谱极化仪通过将斯托克斯参数调幅到频谱载波频率上,使用单个频谱来测量光的完整偏振态。但是,在傅立叶变换域中不受频带限制的光谱特征(如窄带原子吸收线)会产生错误的极化特征。我们提出了一种减少虚假签名(混叠)的技术,该技术可以减少由这些非带宽限制的功能引起的误差。此外,S_o Stokes参数的光谱分辨率得到了改善,达到了光谱仪提供的最大分辨率。提出了在傅立叶变换红外光谱仪上实现该技术的理论模型,其中包括解决晶体内二向色性的增强模型。通过使用两个多阶钒酸钇缓凝剂,在中波长红外(3-5μm)中实验证明了该方法。使用硫化镉缓凝剂可获得其他结果,证明了该技术适用于2.5-15μm的波长。将重建与来自同一系统的常规通道光谱极化重建进行了比较。

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