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Proceedings Paper

Magneto-optical filter: concept and applications in astronomy
Author(s): Alessandro Cacciani; Pier-Francesco Moretti
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Paper Abstract

The MOF is a compact device (15 cm max dimension) displaying a very narrow-band spectral transmission (20 to 70 m$angstrom, single or multiple bands) with intrinsic absolute spectral reference and stability, high peak transmission (close to 50%) and imaging capability. It has been used so far mainly in solar astronomy to detect solar magnetic and velocity fields. Doppler shifts as low as 1 cm/sec equivalent velocity can be measured on the sun (whole disk) using 2 cm aperture telescope and 1 sec exposure time. Its working principle is based on magneto-optical effects on metallic vapors in a magnetic field. An overview of the theoretical model compared with experimental spectroscopic measurements is discussed in the first part. Applications in astronomy, namely helio and astero seismology and magnetographic observations are shown in the second part of this paper.

Paper Details

Date Published: 1 June 1994
PDF: 10 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176751
Show Author Affiliations
Alessandro Cacciani, Univ. of Rome "La Sapienza" (Italy)
Pier-Francesco Moretti, Univ. of Rome "La Sapienza" (Italy)

Published in SPIE Proceedings Vol. 2198:
Instrumentation in Astronomy VIII
David L. Crawford; Eric R. Craine, Editor(s)

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