Adaptive Optics Concept For Multi-Objects 3D Spectroscopy on ELTs
  In this paper, we present a first comparison of different Adaptive Optics (AO) concepts to reach a given scientific specification for 3D spectroscopy on Extremely Large Telescope (ELT). We consider that a range of 30%-50% of Ensquarred Energy (EE) in H band (1.65um) and in an aperture size from 25 to 100mas is representative of the scientific requirements. From these preliminary choices, different kinds of AO concepts are investigated : Ground Layer Adaptive Optics (GLAO), Multi-Object AO (MOAO) and Laser Guide Stars AO (LGS). Using Fourier based simulations we study the performance of these AO systems depending on the telescope diameter. 
B. Neichel, T. Fusco, M. Puech, J-M. Conan, M. Lelouarn, E. Gendron,   F. Hammer, G. Rousset, P. Jagourel and P. Bouchet