Physics – Optics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445...57g&link_type=abstract
IN: Instrumentation in astronomy V; Proceedings of the Fifth Meeting, London, England, September 7-9, 1983 (A85-25360 10-89). Be
Physics
Optics
25
Astronomical Observatories, Astronomical Spectroscopy, Faint Object Camera, Fiber Optics, Optical Coupling, Perforated Plates, Apertures, Cassegrain Optics, Metal Plates, Telescopes
Scientific paper
The design and performance of the improved FOCAP system in use at AAO since 1983 to link the auxiliary Cassegrain focus of the AAT to the long-slit RGO spectrograph are presented and illustrated with drawings, photographs, and a sample spectrum. The system employs bundles of 50 200-micron-core all-silica fibers and an f/6 collimator to increase transmission to 60-70 percent, reduce focal-ratio degradation, and facilitate multiobject spectroscopy; bundles of 400-micron-core fibers are used for poor seeing conditions or slightly extended objects. Consideration is given to the aperture plates, the f/6 input, the calibration lamps, acquisition and alignment procedures, fiber input to the faint-object red spectrograph, and plans to adapt the system to he main focus of the AAT (extending the field from 12 to 40 arcmin).
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