Abstract
A new class of photodetectors, the Hybrid Photo Detectors (HPD), is coming up as a major breakthrough in photodetection. The principle of the HPD is to couple a fully depleted silicon diode or silicon diode array to a photocathode in a vacuum tube. At present HPD's with one diode or a few diodes (Hybrid Photo Multiplier Tubes, HPMT) are commercially available (DEP, The Netherlands, and Hamamatsu, Japan) and a position sensitive photon detector (the Imaging Silicon Pixel Array tube, ISPA tube) is under development in our group (in collaboration with the RD-19 collaboration at CERN). We shall present the main features of HPD's and then our main results and applications for both HPMT's and ISPA tubes on photon counting, on imaging and on high energy physics applications.
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