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

Published online by Cambridge University Press:  01 November 2008

Horst Balthasar ,
N. Bello González ,
M. Collados ,
C. Denker ,
A. Hofmann ,
F. Kneer  and
K. G. Puschmann
Horst Balthasar
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: hbalthasar@aip.de; cdenker@aip.de; ahofmann@aip.de
N. Bello González
Affiliation:
Institut für Astrophysik, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany email: nazaret@astro.physik.uni-goettingen.de; kneer@astro.physik.uni-goettingen.de
M. Collados
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain email: mcv@iac.es; kgp@iac.es
C. Denker
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: hbalthasar@aip.de; cdenker@aip.de; ahofmann@aip.de
A. Hofmann
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: hbalthasar@aip.de; cdenker@aip.de; ahofmann@aip.de
F. Kneer
Affiliation:
Institut für Astrophysik, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany email: nazaret@astro.physik.uni-goettingen.de; kneer@astro.physik.uni-goettingen.de
K. G. Puschmann
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain email: mcv@iac.es; kgp@iac.es
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Abstract

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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.

Keywords

Instrumentation: polarimeters – instrumentation: spectrographs – Sun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 665 - 666
Copyright
Copyright © International Astronomical Union 2009

References

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