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The major advantage of CCDs over other detectors is their high efficiency. The wavelength response for the types of CCD currently in use on La Palma is shown in Figure gif. The best (thinned) devices have a peak efficiency of about 80 per cent, whilst the unthinned ones have a peak efficiency of about 50 per cent.


Figure: Responsive Quantum Efficiency (RQE) as a function of wavelength for the Tektronix and EEV CCD detectors most commonly used on the La Palma Telescopes

Tue Aug 15 16:42:46 BST 1995