Magneto-optical filter: concept and applications in astronomy

Alessandro Cacciani; Pier-Francesco Moretti

doi:10.1117/12.176751

1 June 1994 Magneto-optical filter: concept and applications in astronomy

Alessandro Cacciani, Pier-Francesco Moretti

Proceedings Volume 2198, Instrumentation in Astronomy VIII; (1994) https://doi.org/10.1117/12.176751
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

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.

Citation Download Citation

Alessandro Cacciani and Pier-Francesco Moretti "Magneto-optical filter: concept and applications in astronomy", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); https://doi.org/10.1117/12.176751

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