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The excellent production quality of recent generations of SiliconPhotomultipliers (SiPMs) allows for operation without individual calibration ofthe breakdown voltage. Measurements of the crosstalk probability and therelative gain of 122 SiPMs of type SensL MicroFJ-60035-TSV are presented.Semi-conductor photo sensors have replaced photo multiplier tubes in numerousapplications featuring single-photon resolution, insensitivity to magneticfields, higher robustness and enhanced photo detection efficiency at loweroperation voltage and lower costs. Light guides are used to increase thecomparably small photo sensitive area of SiPMs. Their optical coupling changesthe surface conditions of the sensor and influences the probability forcrosstalk photons to leave the sensor without inducing secondary breakdowns.This study compares properties of sensors that are optically coupled to lightguides with bare sensors, operated at nominal bias voltage. It demonstrates,that the optical coupling to a light guide significantly reduces the crosstalkprobability of the measured sensors.

Calibration of 122 SensL MicroFJ-60035 SiPMs and the reduction of optical crosstalk due to coupled light guides