To appear in the Sept 2000 Encyclopaedia of Astronomy & Astrophysics, MacMillan and Institute of Physics Publishing

TUNABLE IMAGING FILTERS

Joss Bland-Hawthorn


Anglo-Australian Observatory

Abstract. While tunable filters are a recent development in night time astronomy, they have long been used in other physical sciences, e.g., solar physics, remote sensing and underwater communications. With their ability to tune precisely to a given wavelength using a bandpass optimized for the experiment, tunable filters are already producing some of the deepest narrowband images to date of astrophysical sources. Furthermore, some classes of tunable filters can be used in fast telescope beams and therefore allow for narrowband imaging over angular fields of more than a degree over the sky.

Table of Contents

THE PHYSICS OF TUNABLE IMAGING

THE IDEAL DEVICE

SUMMARY OF FILTER TECHNOLOGIES
Monolithic Filters
Gap-scanning Filters
Grating Filters
Birefringent Filters

DIFFERENTIAL IMAGING

WIDE-FIELD IMAGING

BIBLIOGRAPHY & FURTHER READING

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