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Proceedings Paper

The intensity effect in magneto-optical filters
Author(s): M. Oliviero; G. Severino; F. Berrilli; P. F. Moretti; S. M. Jefferies
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Paper Abstract

We used a laser system for determining the bandpasses of the two vapour cells, the Magneto-Optical Filter (MOF) and the Wing Selector (WS), which are the core of solar narrow-band filters based on the MOF technology. A new result, which we called the Intensity Effect, was found: the MOF and WS bandpasses depend not only on the temperature at which the cell is heated and the external magnetic field in which the cell is embedded, but also on the radiation intensity entering the cell. A theoretical interpretation of the Intensity Effect is proposed in terms of the kinetic equilibrium of the potassium atomic populations inside the vapour cell. We need to take the Intensity Effect into account for setting-up MOF based instruments for solar and stellar observations as well as for modelling the MOF and WS spectral transmissions.

Paper Details

Date Published: 6 October 2011
PDF: 12 pages
Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 81480V (6 October 2011); doi: 10.1117/12.893613
Show Author Affiliations
M. Oliviero, INAF - Osservatorio Astronomico di Capodimonte (Italy)
G. Severino, INAF - Osservatorio Astronomico di Capodimonte (Italy)
F. Berrilli, Univ. degli Studi di Roma Tor Vergata (Italy)
P. F. Moretti, Consiglio Nazionale delle Ricerche (Italy)
S. M. Jefferies, Univ. of Hawai'i (United States)

Published in SPIE Proceedings Vol. 8148:
Solar Physics and Space Weather Instrumentation IV
Silvano Fineschi; Judy Fennelly, Editor(s)

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