Kinematic translation mechanism for moderate-sized optics

Details Kinematic translation mechanism for moderate-sized optics Kinematic translation mechanism for moderate-sized optics

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3786..350s&link_type=abstract

Proc. SPIE Vol. 3786, p. 350-361, Optomechanical Engineering and Vibration Control, Eddy A. Derby; Colin G. Gordon; Daniel Vukob

Computer Science

1

Scientific paper

The Echellete Spectrograph and Imager (ESI), currently being completed for use at the cassegrain focus of the Keck II telescope, employs two moderate size translating fold mirrors. These mirrors are used to shift between the three instrument modes; medium resolution echellete mode; low resolution prismatic mode; and imaging mode. In order to maintain the optical stability and calibration of these three modes the mirrors must be removed and repeatably located to within 1.3 arcsecs of tip and tilt. In addition, the mirrors must maintain a fixed orientation relative to the telescope axis under a variety of gravity and thermal loads. In this paper we describe a novel concept for moving and locating these mirrors. Analytical analysis of the mounts is presented. Optical and mechanical testing is described.

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