Design of spatial and modal filters for nulling interferometers

Oswald Wallner; Walter R. Leeb; Reinhold Flatscher

doi:10.1117/12.456984

21 February 2003 Design of spatial and modal filters for nulling interferometers

Oswald Wallner, Walter R. Leeb, Reinhold Flatscher

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.456984
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

Spatial or modal filters are essential parts of highly rejecting nulling interferometers. We review the principle of operation of both types of filters and explain the fundamental physical difference. We point out the filter's individual properties and potentials, and analyze practical limitations. For modal filters we discuss implementation alternatives, also with regard to their suitability for mid-infrared operation. For a single-mode fibre filter we analyze the broadband performance and the minimum length ensuring a prescribed filter action. We further present simulation results of a DARWIN-representative nulling interferometer breadboard which confirm the distinct improvement in rejection ratio due to spatial or modal filtering.

Citation Download Citation

Oswald Wallner, Walter R. Leeb, and Reinhold Flatscher "Design of spatial and modal filters for nulling interferometers", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.456984

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