9 July 1998 Fiber pupil-slicer: a versatile light feed for spectrographs
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Abstract
The basic concept of a new type of versatile light feed using a microlens array and optical fibers configured as a fiber pupil slicer is described in comparison with the existing image slicers. The fiber pupil slicers will open up a wide variety of applications in feeding the images of point sources produced at telescope focus into the entrance slit of the spectrographs by transforming the beam shape as well as the focal ratio. We describe two concrete examples for applying the fiber pupil slicers on the instrumentation of the 8.2 m Subaru Telescope. (1) A new feature provided with these pupil slicers is the realization of multi-object spectroscopic mode for the High Dispersion Spectrograph with cross dispersed echelle format by squeezing the seeing disk in the narrow inter-order spacing at the expense of spectral resolution. (2) Another more obvious application is to improve the throughput and the resolving power of a given spectrograph.
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Masanori Iye, Masanori Iye, Noboru Ebizuka, Noboru Ebizuka, Hideki Takami, Hideki Takami, } "Fiber pupil-slicer: a versatile light feed for spectrographs", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316770; https://doi.org/10.1117/12.316770
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