Towards freeform curved blazed gratings using diamond machining

C. Bourgenot; D. J. Robertson; D. Stelter; S. Eikenberry

doi:10.1117/12.2231182

22 July 2016 Towards freeform curved blazed gratings using diamond machining

C. Bourgenot, D. J. Robertson, D. Stelter, S. Eikenberry

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99123M (2016) https://doi.org/10.1117/12.2231182
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

Concave blazed gratings greatly simplify the architecture of spectrographs by reducing the number of optical components. The production of these gratings using diamond-machining offers practically no limits in the design of the grating substrate shape, with the possibility of making large sag freeform surfaces unlike the alternative and traditional method of holography and ion etching. In this paper, we report on the technological challenges and progress in the making of these curved blazed gratings using an ultra-high precision 5 axes Moore-Nanotech machine. We describe their implementation in an integral field unit prototype called IGIS (Integrated Grating Imaging Spectrograph) where freeform curved gratings are used as pupil mirrors. The goal is to develop the technologies for the production of the next generation of low-cost, compact, high performance integral field unit spectrometers.

Citation Download Citation

C. Bourgenot, D. J. Robertson, D. Stelter, and S. Eikenberry "Towards freeform curved blazed gratings using diamond machining", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99123M (22 July 2016); https://doi.org/10.1117/12.2231182

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