|Number of page(s)
|Wave front sensing
|24 February 2010
Detectors for LGS WF sensing on an ELT: characteristics, special features, limitations, technology
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
a e-mail: email@example.com
The wave front sensing of Laser Guide Star (LGS) light with a Shack-Hartmann sensor (SHWFS) on an ELT requires a large fast low-noise visible detector with high Quantum Efficiency (QE), low latency, low charge diffusion and dark current, and excellent cosmetic quality. Such a device doesn't exist yet, although the CCD technology is already stretched to its limits in order to deliver detectors for the soon-to-come next generation of AO systems (e2v CCD220 for the VLT AO Facility and SPHERE). For three years ESO has been pushing the development of a technological solution that satisfies the need of the AO systems for the European ELT (E-ELT) project. This paper presents the requirements on the detector as well as how they originated and describes the development plan followed by ESO in order to find a suitable technological solution.
© Owned by the authors, published by EDP Sciences, 2010