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Proceedings Article

Design of spatial and modal filters for nulling interferometers

[+] Author Affiliations
Oswald Wallner, Walter R. Leeb

Vienna Univ. of Technology (Austria)

Reinhold Flatscher

Astrium GmbH (Germany)

Proc. SPIE 4838, Interferometry for Optical Astronomy II, 668 (February 24, 2003); doi:10.1117/12.456984
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From Conference Volume 4838

  • Interferometry for Optical Astronomy II
  • Wesley A. Traub
  • Waikoloa, Hawai'i, United States | August 22, 2002

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.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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, 668 (February 24, 2003); doi:10.1117/12.456984; http://dx.doi.org/10.1117/12.456984


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