SiPM PDE Measurement, 20171012

This is experiment was designed by David-Michael based on the paper found here.

As the SiPM photocurrent couldn't be measured directly, a new method was investigated for measuring the SiPM's PDE. To summarize, the photodiode will be used to measure the power of the white light source, which will then be converted into a number of photons per second using Equation 1:
(1),
where P is the power (W) of the white light source measured by the photodiode at a given wavelength Then, as the photodetection efficiency is defined in Equation 2:
(2),
Equation 1 can be used to find the number of incident photons per second at a given wavelength, giving Equation 3:
(3),
where r_L(λ) is the number of photons detected per second by the SiPM when illuminated by light of wavelength λ and r_D(λ) is the number of photons detected per second when no light source is present (dark count rate). The photon counts per second along with the expected power must all be corrected for detector area. The rate of photons per second can be measured using the TB4 board and similar analysis to determining the dark count rate.

Photodiode active area: 1cm^2

SiPM active area: 1.33mm^2