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Proceedings Paper

Multiband interference filters for differential imaging
Author(s): Sonia Cianci; Jonathan Bland-Hawthorn; John W. O'Byrne
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Paper Abstract

Advances in thin film technology in recent years are providing new possibilities for interference filters. The isolation of spectral bands for astronomical imaging is no longer limited to single segments of the electromagnetic spectrum. Multiple passband, or 'multi-band' filters can now be manufactured for simultaneous narrowband imaging at several widely separated wavelengths. Such filters provide major benefits to differential imaging with tunable filters since systematic uncertainties arising form atmospheric variations can be averaged out. A multi-band thin film interference filter has been manufactured specifically for passbands at H(alpha) and H(beta) . In tandem with the AAOs TAURUS Tunable Filter and charge shuffling techniques, this double-band filter allows for accurate mapping of the local dust extinction and star formation rates in nearby spiral galaxies. Additional filter designs for a variety of emission-line combinations and their scientific applications are also discussed.

Paper Details

Date Published: 16 August 2000
PDF: 8 pages
Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); doi: 10.1117/12.395455
Show Author Affiliations
Sonia Cianci, Univ. of Sydney (Australia)
Jonathan Bland-Hawthorn, Anglo-Australian Observatory (Australia)
John W. O'Byrne, Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 4008:
Optical and IR Telescope Instrumentation and Detectors
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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