Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4006..340m&link_type=abstract
Proc. SPIE Vol. 4006, p. 340-348, Interferometry in Optical Astronomy, Pierre J. Lena; Andreas Quirrenbach; Eds.
Astronomy and Astrophysics
Astronomy
6
Scientific paper
This paper describes a laboratory experiment of achromatic nulling in the visible to SIM requirements. The experiment employs phase shifting interferometry techniques on a spectrally dispersed fringe to measure the phase as a function of wavelength. This phase is then used by a control system that adjusts the tilt of the plates and the air path difference until a satisfactory level of null is achieved. A fast servo adjusts the air path difference to stabilize the phase to the nanometer level. The paper includes a discussion of the design issues, the experimental measure of phase versus wavelength, a description of the control system, and a preliminary measure of the null.
Burge James H.
Morgan Rhonda M.
Woolf Neville J.
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