Dr Ariadna Calcines Rosario ariadna.calcines@durham.ac.uk
Head of Optical Design - CfAI
Design of freeform diffraction gratings: performance, limitations and potential applications
Calcines, Ariadna; Bourgenot, Cyril; Sharples, Ray M.
Authors
Cyril Bourgenot cyril.bourgenot@durham.ac.uk
Associate Professor
Professor Ray Sharples r.m.sharples@durham.ac.uk
Professor
Contributors
Ramón Navarro
Editor
Roland Geyl
Editor
Abstract
Spectroscopy is a key technique in astronomy and nowadays most major telescopes include at least one spectrograph in their instrument suite. The dispersive element is one of the most important components and it defines the pupil size, spectral resolution and efficiency. Different types of dispersive elements have been developed including prisms, grisms, VPH and echelle gratings. In this paper, we investigate the design and optimization possibilities offered by metallic freeform gratings using diamond machining techniques. The incorporation of power in a diffraction grating enables several functionalities within the same optical component, such as the combination of dispersion, focusing and field reformat. The resulting benefit is a reduction in the number of surfaces and therefore, an improvement in the throughput. Freeform surfaces are also interesting for their enhanced optical performance by allowing extra degree of freedom in the optimization. These degrees of freedom include the shape of the substrate but also additional parameters such as the pitch or the number of blaze angle. Freeform gratings used as single optical component systems also present some limitations such as the trade-off between optical quality versus field of view or the spectral range versus spectral resolution. This paper discusses the possibility offered by the design of freeform gratings for low to medium spectral resolution, in the visible and near-infrared, for potential applications in ultra-compact integral field spectrographs.
Citation
Calcines, A., Bourgenot, C., & Sharples, R. M. (2018). Design of freeform diffraction gratings: performance, limitations and potential applications. In R. Navarro, & R. Geyl (Eds.), Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. https://doi.org/10.1117/12.2312125
Presentation Conference Type | Conference Paper (Published) |
---|---|
Conference Name | Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III: SPIE Astronomical Telescopes + Instrumentation 2018 |
Start Date | Jun 10, 2018 |
End Date | Jun 15, 2018 |
Online Publication Date | Jul 10, 2018 |
Publication Date | 2018 |
Deposit Date | Sep 25, 2018 |
Publicly Available Date | Jan 17, 2023 |
Publisher | SPIE |
Volume | 10706 |
Book Title | Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III |
ISBN | 9781510619654 |
DOI | https://doi.org/10.1117/12.2312125 |
Public URL | https://durham-repository.worktribe.com/output/1145584 |
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Copyright Statement
Copyright (2018) Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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