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Optical Engineering

GREGOR Fabry-Pérot interferometer and its companion the blue imaging solar spectrometer
Author(s): Klaus G. Puschmann; Carsten J. Denker; Horst Balthasar; Rohan E. Louis; Emil Popow; Manfred Woche; Christian Beck; Thomas Seelemann; Reiner Volkmer
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Paper Abstract

The GREGOR Fabry-Pérot Interferometer (GFPI) is one of three first-light instruments of the German 1.5-m GREGOR solar telescope at the Observatorio del Teide, Tenerife, Spain. The GFPI allows fast narrow-band imaging and postfactum image restoration. The retrieved physical parameters will be a fundamental building block for understanding the dynamic sun and its magnetic field at spatial scales down to ∼50  km on the solar surface. The GFPI is a tunable dual-etalon system in a collimated mounting. It is designed for spectrometric and spectropolarimetric observations between 530–860 nm and 580–660 nm, respectively, and possesses a theoretical spectral resolution of R250,000. Large-format, high-cadence charged coupled device detectors with sophisticated computer hard- and software enable the scanning of spectral lines in time-spans equivalent to the evolution time of solar features. The field-of-view (FOV) of 50′′×38′′ covers a significant fraction of the typical area of active regions in the spectroscopic mode. In case of Stokes-vector spectropolarimetry, the FOV reduces to 25′′×38′′. The main characteristics of the GFPI including advanced and automated calibration and observing procedures are presented. Improvements in the optical design of the instrument are discussed and first observational results are shown. Finally, the first concrete ideas for the integration of a second FPI, the blue imaging solar spectrometer, are laid out, which will explore the blue spectral region below 530 nm.

Paper Details

Date Published: 21 March 2013
PDF: 15 pages
Opt. Eng. 52(8) 081606 doi: 10.1117/1.OE.52.8.081606
Published in: Optical Engineering Volume 52, Issue 8
Show Author Affiliations
Klaus G. Puschmann, Leibniz-Institut für Astrophysik Potsdam (Germany)
Carsten J. Denker, Leibniz-Institut für Astrophysik Potsdam (Germany)
Horst Balthasar, Leibniz-Institut für Astrophysik Potsdam (Germany)
Rohan E. Louis, Leibniz-Institut für Astrophysik Potsdam (Germany)
Emil Popow, Leibniz-Institut für Astrophysik Potsdam (Germany)
Manfred Woche, Leibniz-Institut für Astrophysik Potsdam (Germany)
Christian Beck, Instituto de Astrofísica de Canarias (Spain)
Thomas Seelemann, LaVision GmbH (Germany)
Reiner Volkmer, Kiepenheuer-Institut für Sonnenphysik (Germany)

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