Alignment of the grating wheel mechanism for a ground-based cryogenic near-infrared astronomy instrument

Details Alignment of the grating wheel mechanism for a ground-based cryogenic near-infrared astronomy instrument Alignment of the grating wheel mechanism for a ground-based cryogenic near-infrared astronomy instrument

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5172...36g&link_type=abstract

Cryogenic Optical Systems and Instruments X. Edited by Heaney, James B.; Burriesci, Lawrence G. Proceedings of the SPIE, Volume

Computer Science

Performance

Scientific paper

We describe the population, optomechanical alignment, and alignment verification of near-infrared gratings on the grating wheel mechanism (GWM) for the Infrared Multi-Object Spectrometer (IRMOS). IRMOS is a cryogenic (80 K), principle investigator-class instrument for the 2.1 m and Mayall 3.8 m telescopes at Kitt Peak National Observatory, and a MEMS spectrometer concept demonstrator for the James Webb Space Telescope. The GWM consists of 13 planar diffraction gratings and one flat imaging mirror (58x57 mm), each mounted at a unique compound angle on a 32 cm diameter gear. The mechanism is predominantly made of Al 6061. The grating substrates are stress relieved for enhanced cryogenic performance. The optical surfaces are replicated from off-the-shelf masters. The imaging mirror is diamond turned. The GWM spans a projected diameter of ~48 cm when assembled, utilizes several flexure designs to accommodate potential thermal gradients, and is controlled using custom software with an off-the-shelf controller. Under ambient conditions, each grating is aligned in six degrees of freedom relative to a coordinate system that is referenced to an optical alignment cube mounted at the center of the gear. The local tip/tilt (Rx/Ry) orientation of a given grating is measured using the zero-order return from an autocollimating theodolite. The other degrees of freedom are measured using a two-axis cathetometer and rotary table. Each grating's mount includes a one-piece shim located between the optic and the gear. The shim is machined to fine align each grating. We verify ambient alignment by comparing grating diffractive properties to model predictions.

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