Abstract
We have recently developed a greatly improved version of the High-gain Avalanche Rushing amorphous Photoconductor (HARP) pickup tube with a selenium target 25-μm thick. When this advanced pickup tube is operated with an avalanche-mode at a target voltage of 2500 V, its sensitivity is about 60 times as great as the conventional HARP pickup tube with a target 2-μm thick. The HARP handheld camera equipped with the new pickup tubes has a maximum sensitivity of 11 lx at F8. This means that the HARP camera is about 100 times as sensitive as that of a CCD camera. This ultrahigh-sensitivity HARP camera is a powerful tool for reporting breaking news at night and other low-light conditions, the production of scientific programs, and numerous other applications.
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