Combining freeform-shaped holographic grating and curved detectors in a scheme of multi-slit astronomic spectrograph

Eduard R. Muslimov; Emmanuel Hugot; Marc Ferrari

doi:10.1117/12.2264790

15 May 2017 Combining freeform-shaped holographic grating and curved detectors in a scheme of multi-slit astronomic spectrograph

Eduard R. Muslimov, Emmanuel Hugot, Marc Ferrari

Author Affiliations +

Proceedings Volume 10233, Holography: Advances and Modern Trends V; 102331M (2017) https://doi.org/10.1117/12.2264790
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

In the present work we consider optical design of a multi-slit astronomic spectrograph for UV domain with freeform reflective elements. The scheme consists of only two reflective elements – a holographic grating imposed on freeform surface and a freeform mirror. The freeforms are described by standard Zernike polynomials and the hologram is recorded by two coherent point sources. We demonstrate that in such a scheme it’s possible to obtain quite high optical quality for an extended field of view and relatively high dispersion on a curved image surface. The spectrograph works with linear field of view of 76x32 mm and provides reciprocal linear dispersion equal to 0.5 nm/mm and typical resolving power of 15 000 over the UV range of 100-200 nm. Feasibility of the optical components is discussed and coupling of the spectrograph with a TMA telescope is demonstrated.

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Eduard R. Muslimov, Emmanuel Hugot, and Marc Ferrari "Combining freeform-shaped holographic grating and curved detectors in a scheme of multi-slit astronomic spectrograph", Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102331M (15 May 2017); https://doi.org/10.1117/12.2264790

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KEYWORDS

Spectrographs

Holography

Sensors

Mirrors

Spectral resolution

Ultraviolet radiation

Image quality

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