photocathode active area

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Photomultipliers are offered in a range of geometries and sizes to cover applications involving both remote and directly coupled light sources. In end window photomultipliers, the photocathode is deposited as a semitransparent layer directly on the inside of the window. In the majority of types the active area has a circular geometry. Some have a reduced active area, achieved by electrostatic focusing, which can be an advantage in the detection of very weak light sources. Special photocathode geometries, have been introduced for large volume, extended area and large solid angle applications.

For more detailed information, request our brochure "Understanding photomultipliers" via this form.