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Proceedings Paper

Machining of ZnSe grisms for the Rapid Infrared Imager Spectrograph (RIMAS): effect of diamond crystal orientation
Author(s): Paul J. Kuzmenko; Steve L. Little; Alexander S. Kutyrev; Michael Hunter
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Paper Abstract

The Rapid Infrared Imager/Spectrograph (RIMAS) is an instrument designed to observe gamma ray burst afterglows. Dispersion in the moderate resolution mode (R~4000) is provided by ZnSe grisms: one covering the Y and J bands and the other covering the H and K. Each has a clear aperture of 44 mm. For the HK grism the blaze is 49.9° with a 20 line/mm period. The grooves cover an area of 69 mm x 45 mm.

The HK grism was diamond machined on the Precision Engineering Research Lathe (PERL) at LLNL. Chipping of the grooves increased from moderate to severe as the cutting progressed resulting in excess scattered light and reduced diffraction efficiency. High magnification optical microscopy and SEM of the cutting edges indicated damage to the tool caused by wear.

A comparison of the outcomes of ZnSe gratings and grisms machined at LLNL indicated that chipping was minimal in low blaze angle cuts but moderate to severe with the blaze angle near 45° as in the HK grism. Vendor records showed that the (100) crystal planes of the diamond were aligned parallel to the tool shank. Therefore the (100) planes are closely aligned with the cutting edge in low blaze angle tools but 45° off in the HK tool. We believe that this misalignment of the cutting edge with the (100) crystal plane in the HK tool produced excessive tool wear resulting in the chipped grooves observed.

Paper Details

Date Published: 10 July 2018
PDF: 11 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070659 (10 July 2018); doi: 10.1117/12.2313020
Show Author Affiliations
Paul J. Kuzmenko, Lawrence Livermore National Lab. (United States)
Steve L. Little, Lawrence Livermore National Lab. (United States)
Alexander S. Kutyrev, NASA Goddard Space Flight Ctr. (United States)
Michael Hunter, Chardon Tool (United States)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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