ELTs adaptive optics for multi-objects 3D spectroscopy: key parameters and design rules

B. Neichel; J.-M. Conan; T. Fusco; E. Gendron; M. Puech; G. Rousset; F. Hammer

doi:10.1117/12.671415

28 June 2006 ELTs adaptive optics for multi-objects 3D spectroscopy: key parameters and design rules

B. Neichel, J.-M. Conan, T. Fusco, E. Gendron, M. Puech, G. Rousset, F. Hammer

Proceedings Volume 6272, Advances in Adaptive Optics II; 62721X (2006) https://doi.org/10.1117/12.671415
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

In the last few years, new Adaptive Optics [AO] techniques have emerged to answer new astronomical challenges: Ground-Layer AO [GLAO] and Multi-Conjugate AO [MCAO] to access a wider Field of View [FoV], Multi-Object AO [MOAO] for the simultaneous observation of several faint galaxies, eXtreme AO [XAO] for the detection of faint companions. In this paper, we focus our study to one of these applications : high red-shift galaxy observations using MOAO techniques in the framework of Extremely Large Telescopes [ELTs]. We present the high-level specifications of a dedicated instrument. We choose to describe the scientific requirements with the following criteria : 40% of Ensquared Energy [EE] in H band (1.65μm) and in an aperture size from 25 to 150 mas. Considering these specifications we investigate different AO solutions thanks to Fourier based simulations. Sky Coverage [SC] is computed for Natural and Laser Guide Stars [NGS, LGS] systems. We show that specifications are met for NGS-based systems at the cost of an extremely low SC. For the LGS approach, the option of low order correction with a faint NGS is discussed. We demonstrate that, this last solution allows the scientific requirements to be met together with a quasi full SC.

Citation Download Citation

B. Neichel, J.-M. Conan, T. Fusco, E. Gendron, M. Puech, G. Rousset, and F. Hammer "ELTs adaptive optics for multi-objects 3D spectroscopy: key parameters and design rules", Proc. SPIE 6272, Advances in Adaptive Optics II, 62721X (28 June 2006); https://doi.org/10.1117/12.671415

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