Reduction of optical crosstalk in SiPMs due to coupled light guides and
investigation of other properties demonstrated with the SensL
MicroFJ-60035-TSV
The optical coupling of light guides to Silicon Photomultipliers (SiPMs)
influences the probability for optical crosstalk. Measurements of the crosstalk
probability and the relative gain of 122 SiPMs of type SensL MicroFJ-60035-TSV
are presented. Semi-conductor photo sensors have replaced photo multiplier
tubes in numerous applications featuring single-photon resolution,
insensitivity to magnetic fields, higher robustness and enhanced photo
detection efficiency at lower operation voltage and lower costs. Light guides
are used to increase the comparably small photo sensitive area of SiPMs. Their
optical coupling changes the surface conditions of the sensor and influences
the probability for crosstalk photons to leave the sensor without inducing
secondary breakdowns. This study compares properties of sensors that are
optically coupled to light guides with bare sensors, operated at nominal bias
voltage. It demonstrates, that the optical coupling to a light guide
significantly reduces the crosstalk probability of the measured sensors