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A full-Stokes polarimeter for the GREGOR Fabry-Perot interferometer

  • Horst Balthasar (a1), N. Bello González (a2), M. Collados (a3), C. Denker (a1), A. Hofmann (a1), F. Kneer (a2) and K. G. Puschmann (a3)...
Abstract

One of the first post-focus instruments of the new solar telescope GREGOR will be a Fabry-Perot spectrometer, which is an upgrade of the Göttingen Fabry-Perot interferometer at the Vacuum Tower Telescope (VTT) on Tenerife. This spectrometer is equipped with a full-Stokes polarimeter. The modulation is performed with two ferroelectric liquid crystals, one acting nominally as quarter-wave plate, and the other as half-wave plate. A modified Savart plate serves as polarimetric beam splitter. With the present liquid crystals, the optimum wavelength range of this polarimeter is between 580 and 660 nm. The spectro-polarimeter will benefit from the capabilities of the new telescope GREGOR which will provide a spatial resolution of about 0″.1 (75 km on the solar surface). Thus we will be able to investigate small magnetic features, and we will study their development with high cadence.

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      A full-Stokes polarimeter for the GREGOR Fabry-Perot interferometer
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References
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Bello González, N. & Kneer, F. 2008, A&A 480, 265
Bendlin, C., Volkmer, R., & Kneer, F. 1992, A&A 257, 817
Keller, C. U. 2006, private communication
Keller, C. U. & von der Lühe, O. 1992, A&A 261, 321
Hofmann, A., Rendtel, J., & Arlt, K. 2008, Cent. Eur. Astrophys. Bull., submitted
Puschmann, K. G., Kneer, F., Seelemann, T., & Wittmann, A. D. 2006, A&A 451, 1151
Volkmer, R., von der Lühe, O., Kneer, F., and 17 coauthors 2007, in Kneer, F., Puschmann, K. G., Wittmann, A. D. (eds.) Modern Solar Facilities - Advanced Solar Science, Universitätsverlag Göttingen, p. 39.
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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