New type of single-object optical fiber coupler

Details New type of single-object optical fiber coupler New type of single-object optical fiber coupler

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1235..763z&link_type=abstract

IN: Instrumentation in astronomy VII; Proceedings of the Meeting, Tucson, AZ, Feb. 13-17, 1990 (A91-29601 11-35). Bellingham, WA

Physics

Optics

Cassegrain Optics, Couplers, Optical Fibers, Reflecting Telescopes, Spectrographs, Astronomical Spectroscopy, Design Analysis, Imaging Techniques, Optical Paths

Scientific paper

A new type of astronomical optical-fiber coupler is described which couples the f/16 Cassegrain focus of the 60-cm reflective telescope at Purple Mt. Observatory (PMO) and the entrance slit of a prism spectrograph located in the lab under the observing floor. The single multimode gradient-index optical fiber has a length of about 25 m, core diameter of 50 microns, and effective NA of 0.2. At both ends of the fiber, GRIN rod lenses with diameter of 1 mm are used as f-ratio transverters. Techniques for achieving alignment between fiber and GRIN rod lenses and guiding are given in detail. Primary experimental observations with this coupler have been carried out, and spectra of Alpha Lyr are obtained.

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