The optical sensitivity of SiPM is typically given by the photon detection efficiency (PDE), which is the ratio of detected photo-electrons and the number of incident photons. This value can be used to calculate the responsivity of the sensor by the following equation:

• = Photon Detection Efficiency
• = Wavelength
• = Gain
• = Electron Charge
• = Afterpulsing Probability
• = Crosstalk Probability
• = Planck Constant
• = Speed of light

Photon Detection Efficiency Calculator (SiPM)