The absolute measurement of the Photo Detection Efficiency (PDE) of a SiPM over the whole visible range using continuous light is not a straightforward task as it requires the accurate determination of the detector gain. We have developed at LAL a process to achieve an absolute PDE with an accuracy of 5 %.

Conclusion

• 5% absolutePDE accuracy @ all Vbias and (400 – 700 nm)

• the SiPM gain is determined from the “current” PDE & “counting” PDE comparison need of a very well calibrated test bench

• the direct gain measurement in dark conditions gives errors of 10 to 20 % need of detailed analysis of secondary effects (after-

pulses, crosstalk) and dark noise distribution (ongoing study in collaboration with Fermilab).

MPPC absolute PDE measurement with continuous and pulsed light

Vincent Chaumat, Cyril Bazin, Nicoleta Dinu, Véronique Puill, Jean-François Vagnucci

Research & Study Detector Group

PHOTODET 2012

LAL, Orsay, June

IPMT PMT photo generated current (A), RSPMT PMT anode sensibility (A/W), GPMT PMT gain, SPMT PMT illuminated surface (mm²)

Current method • continuous monochromatic source • incident flux