Straylight considerations for NIR spectrographs

Marc Ferlet

doi:10.1117/12.788762

9 July 2008 Straylight considerations for NIR spectrographs

Marc Ferlet

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 701436 (2008) https://doi.org/10.1117/12.788762
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

Modern NIR spectrographs aiming at the detection and spectral study of faint deep sky objects are potentially sensitive to performances-degrading straylight effects. In particular, the following straylight mechanisms have been identified: - ghost images, inherent to large aperture broadband camera in multi-band spectrographs, have often specific distribution which can (and needs to) be simulated when baffling is not possible; - scattered light generated at the surface of the component is also interesting in the NIR spectrum as it is often at the cross-over between a micro-roughness dominated behaviour and a particulate contamination dominated one; - the use of dispersing element such as diffraction grating brings its own straylight issues related to the control of non-evanescent orders and under incidence different from the one given by the main sequential optical path from telescope to detector; - finally, thermal background from local spectrograph environment or more remote observatory-level sources affects particularly the long wavelength end of the NIR spectrum (H and K bands typically) and in-band or out-of-band rejection is desirable as complementary or even alternative to potentially complex and costly full cryogenic operation. These different points are discussed and illustrated through case studies of several NIR multi-object spectrograph designs like the fibre-fed reflective grating with OH lines suppression FMOS (designed and built), the broadband multi-IFU slicer and slit grating KMOS (under development) and the fibre-fed grism-based SIDE (in conceptual design stage).

Citation Download Citation

Marc Ferlet "Straylight considerations for NIR spectrographs", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701436 (9 July 2008); https://doi.org/10.1117/12.788762

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KEYWORDS

Spectrographs

Cameras

Sensors

Staring arrays

Near infrared

Optical filters

Scattering

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