Demonstration of nulling using delay line phase shifters

Casper van der Avoort; Arjan Mieremet; Silvania F. Pereira; Joseph J. M. Braat

doi:10.1117/12.551176

20 October 2004 Demonstration of nulling using delay line phase shifters

Casper van der Avoort, Arjan Mieremet, Silvania F. Pereira, Joseph J. M. Braat

Proceedings Volume 5491, New Frontiers in Stellar Interferometry; (2004) https://doi.org/10.1117/12.551176
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

We present results of experiments obtained using a new nulling technique that enables deep nulling without the use of achromatic phase shifters. The experimental set-up consists of a three-beam interferometer that should provide a nulling depth of several thousands over a wavelength range of 500 to 650 nm. The intended depth of null was not achieved and further experiments on determining the spectrum of each beam revealed why. We describe a method of obtaining accurate beam spectra in a multi-beam interferometer. The insights on the need of spectral shape control were tested with our nulling theory and proved the sensitivity of this nulling approach with respect to spectral mismatches.

Citation Download Citation

Casper van der Avoort, Arjan Mieremet, Silvania F. Pereira, and Joseph J. M. Braat "Demonstration of nulling using delay line phase shifters", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); https://doi.org/10.1117/12.551176

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