False signature reduction in channeled spectropolarimetry

Julia Craven; Michael W. Kudenov

doi:10.1117/1.3430565

1 May 2010 False signature reduction in channeled spectropolarimetry

Julia Craven, Michael W. Kudenov

Author Affiliations +

Optical Engineering, Vol. 49, Issue 5, 053602 (May 2010). https://doi.org/10.1117/1.3430565

Abstract

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 polarimetric 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 S0 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.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Julia Craven and Michael W. Kudenov "False signature reduction in channeled spectropolarimetry," Optical Engineering 49(5), 053602 (1 May 2010). https://doi.org/10.1117/1.3430565

Published: 1 May 2010

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