Large-prism mounting to minimize rotation in Cassegrain instruments

Andrew I. Sheinis; Jerry E. Nelson; Matthew V. Radovan

doi:10.1117/12.316813

9 July 1998 Large-prism mounting to minimize rotation in Cassegrain instruments

Andrew I. Sheinis, Jerry E. Nelson, Matthew V. Radovan

Proceedings Volume 3355, Optical Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.316813
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The Echellette Spectrograph and Imager (ESI), currently being developed for use at the Cassegrain focus of the Keck II 10-m telescope, employs two large (25 kg) prisms for cross dispersion. In order to maintain optical stability in the spectroscopic modes, these prisms must maintain a fixed angle relative to the nominal spectrograph optical axis under a variety of flexural and thermal loads. In this paper, we describe a novel concept for mounting large prisms that has been developed to address this issue. Analytical and finite element analyses (FEA) of the mounts are presented. Optical and mechanical tests are also described.

Citation Download Citation

Andrew I. Sheinis, Jerry E. Nelson, and Matthew V. Radovan "Large-prism mounting to minimize rotation in Cassegrain instruments", Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); https://doi.org/10.1117/12.316813

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