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Proceedings Paper

Strategies for single-point diamond machining a large format germanium blazed immersion grating
Author(s): R. C. Montesanti; S. L. Little; P. J. Kuzmenko; J. V. Bixler; J. L. Jackson; J. G. Lown; R. E. Priest; B. E. Yoxall
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Paper Abstract

A large format germanium immersion grating was flycut with a single-point diamond tool on the Precision Engineering Research Lathe (PERL) at the Lawrence Livermore National Laboratory (LLNL) in November – December 2015. The grating, referred to as 002u, has an area of 59 mm x 67 mm (along-groove and cross-groove directions), line pitch of 88 line/mm, and blaze angle of 32 degree. Based on total groove length, the 002u grating is five times larger than the previous largest grating (ZnSe) cut on PERL, and forty-five times larger than the previous largest germanium grating cut on PERL. The key risks associated with cutting the 002u grating were tool wear and keeping the PERL machine running uninterrupted in a stable machining environment. This paper presents the strategies employed to mitigate these risks, introduces pre-machining of the as-etched grating substrate to produce a smooth, flat, damage-free surface into which the grooves are cut, and reports on trade-offs that drove decisions and experimental results.

Paper Details

Date Published: 22 July 2016
PDF: 11 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991233 (22 July 2016); doi: 10.1117/12.2234248
Show Author Affiliations
R. C. Montesanti, Lawrence Livermore National Lab. (United States)
S. L. Little, Lawrence Livermore National Lab. (United States)
P. J. Kuzmenko, Lawrence Livermore National Lab. (United States)
J. V. Bixler, Lawrence Livermore National Lab. (United States)
J. L. Jackson, Lawrence Livermore National Lab. (United States)
J. G. Lown, Akima Infrastructure Services, Inc. (United States)
R. E. Priest, Lawrence Livermore National Lab. (United States)
B. E. Yoxall, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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