Physics – Optics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apopt..48..868g&link_type=abstract
Applied Optics, vol. 48, issue 5, p. 868-880
Physics
Optics
6
Scientific paper
Phase shifters are a key component of nulling interferometry, one of the potential routes to enabling the measurement of faint exoplanet spectra. Here, three different achromatic phase shifters are evaluated experimentally in the mid-infrared, where such nulling interferometers may someday operate. The methods evaluated include the use of dispersive glasses, a through-focus field inversion, and field reversals on reflection from antisymmetric flat-mirror periscopes. All three approaches yielded deep, broadband, mid-infrared nulls, but the deepest broadband nulls were obtained with the periscope architecture. In the periscope system, average null depths of 4×10-5 were obtained with a 25% bandwidth, and 2×10-5>/SUP> with a 20% bandwidth, at a central wavelength of 9.5 μm. The best short term nulls at 20% bandwidth were approximately 9×10-6, in line with error budget predictions and the limits of the current generation of hardware.
Diaz Rosemary T.
Gappinger Robert O.
Ksendzov Alexander
Lawson Peter R.
Lay Oliver P.
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