Optical design of the FUEGOS high-resolution multiple fiber spectrograph

Martin Casse; Jacques Baudrand; Jean-Pierre Lemonnier

doi:10.1117/12.176798

1 June 1994 Optical design of the FUEGOS high-resolution multiple fiber spectrograph

Martin Casse, Jacques Baudrand, Jean-Pierre Lemonnier

Proceedings Volume 2198, Instrumentation in Astronomy VIII; (1994) https://doi.org/10.1117/12.176798
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

This paper describes the feasibility design of a high resolution multiple object fiber spectrograph. High resolution is obtained without cross dispersion with large 305 mm ruled length gratings and the use of the fiber link as an image slicer. The grating has a high groove density to provide a free spectral range larger than the CCD detector. The use of microlenses as focal converter at the slit has several implications on the design of the spectrograph. Unlike single object spectrographs, the presence of a significant telecentric slit field, 6 degrees long, makes the standard parabolic collimator inappropriate. A catadioptric collimator is used instead in double pass to image the intermediary spectrum sideways of the slit. The use of the white pupil and the good image quality of the collimator permit various camera options. The one foreseen is a f/1.25 finite conjugate catadioptric camera with a (2048)²24 micrometers pixel detector.

Citation Download Citation

Martin Casse, Jacques Baudrand, and Jean-Pierre Lemonnier "Optical design of the FUEGOS high-resolution multiple fiber spectrograph", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); https://doi.org/10.1117/12.176798

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