Instrumentation, Measurement, and Metrology

False signature reduction in channeled spectropolarimetry

[+] Author Affiliations
Julia Craven

The University of Arizona, College of Optical Sciences, 1630 East University Boulevard, Tucson, Arizona 85721

Michael W. Kudenov

The University of Arizona, College of Optical Sciences, 1630 East University Boulevard, Tucson, Arizona 85721

Opt. Eng. 49(5), 053602 (May 24, 2010). doi:10.1117/1.3430565
History: Received December 17, 2009; Revised March 11, 2010; Accepted March 18, 2010; Published May 24, 2010; Online May 24, 2010
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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 (35μm) with the use of two multiple-order yttrium vanadate retarders. Additional results demonstrating the technique for wavelengths spanning 2.515μm are obtained using cadmium sulfide retarders. Reconstructions are compared to conventional channeled spectropolarimetric reconstructions from the same system.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Julia Craven and Michael W. Kudenov
"False signature reduction in channeled spectropolarimetry", Opt. Eng. 49(5), 053602 (May 24, 2010). ; http://dx.doi.org/10.1117/1.3430565


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