DARWIN nulling interferometer breadboard III - symmetry requirements and modal filtering

Details DARWIN nulling interferometer breadboard III - symmetry requirements and modal filtering DARWIN nulling interferometer breadboard III - symmetry requirements and modal filtering

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.539..649w&link_type=abstract

In: Proceedings of the Conference on Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets, 22-25 A

Other

Modal Filter, Spatial Filter, Nulling, Interferometry, Single-Mode Waveguide

Scientific paper

In a nulling interferometer, the requirements on uniformity of phase, amplitude, and state of polarisation among the interferometer arms are stringent and hardly to be met in practice. The application of modal filters makes deep nulling possible as such filters may reduce the mismatch of interfering fields. We review the principle of modal filtering and discuss the achievable filter bandwidth and the effect of coupling phase. We give an overview over waveguides suitable for modal filtering, including also lossy multi-mode waveguides.

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