Prototype single-mode fiber beam combiner for the CHARA array

Details Prototype single-mode fiber beam combiner for the CHARA array Prototype single-mode fiber beam combiner for the CHARA array

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3350.1037t&link_type=abstract

Proc. SPIE Vol. 3350, p. 1037-1044, Astronomical Interferometry, Robert D. Reasenberg; Ed.

Astronomy and Astrophysics

Astronomy

Scientific paper

Traditional methods of data collection in active fringe tracking Michelson stellar interferometers involve logging and analyzing the signal within the fringe tracking system for the scientific information about the object being observed. While these methods are robust and have produced excellent scientific results, they become more problematic as next-generation Michelson stellar interferometers are built with more telescopes and the aim of performing routine imaging. The Center for High Angular Resolution Astronomy (CHARA) Array is one such next-generation instrument presently under construction on Mt. Wilson, north of Los Angeles, California. The CHARA array will feature a separation of the tasks of active fringe tracking and imaging. In anticipation of the advantages afforded by the task separation, a prototype imager was developed. The prototype imager employs single-mode fiber optic strands to convey the light form simulated telescopes to a smaller, non-redundant, remapped pupil plane, which in turn feeds a low resolution prism spectrograph. The spectrograph features two cylindrical optical elements whose net effect is to focus the light to a smaller plate scale in the spectral dimension than in the orthogonal spatial dimension.

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