APPARATUS COMPRISING A SEMICONDUCTOR-BASED PHOTOMULTIPLIER AND METHOD REGARDING GAIN STABILIZATION

Apparatuses and methods as described herein can be used to help stabilize the gain of a semiconductor-based photomultiplier. In an embodiment, an apparatus can include a semiconductor-based photomultiplier. The apparatus can be configured to inject a first input pulse into the semiconductor-based photomultiplier; determine a revised bias voltage for the semiconductor-based photomultiplier based at least in part on a first output pulse corresponding to the first input pulse and a second output pulse from the semiconductor-based photomultiplier that is obtained at another time as compared to the first output pulse; and adjust a bias voltage for the semiconductor-based photomultiplier to the revised bias voltage. A calibration light source, a temperature sensor, and temperature information are not required to be used for the method.