Achromatic prism-based phaseshifter for nulling in the visible

Details Achromatic prism-based phaseshifter for nulling in the visible Achromatic prism-based phaseshifter for nulling in the visible

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4852..803v&link_type=abstract

Interferometry in Space. Edited by Shao, Michael. Proceedings of the SPIE, Volume 4852, pp. 803-808 (2003).

Computer Science

Scientific paper

Nulling interferometry is a direct method to detect earth-like planets. To determine whether a planet is earth-like spectrometry is performed on a broadband infra-red (l = 4-20 mm) input signal from the planet. The star signal in this region is roughly 106 times stronger than the planet signal. Nulling interferometry should decrease the broadband star signal by about this factor of 106. This can be performed using an achromatic phaseshifter based on dispersive elements. The design of a complete breadboard under an ESA contract including a prism based (eight prisms in total) dispersive achromatic phaseshifter is presented including error budget and implied tolerances on the mechanical components. Measurements with this breadboard resulted in nulling depths of 3.5·105 for polarized laser light and just below 103 for polarized visible broadband light in the wavelength range of 530-750nm.

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