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The method to calibarte a single photon counter

There are two steps to calibrate a single photon counter. First, to confirm the linearization of the photon counting and the light’s energy, two methods that the inverse square law of light intensity and the relations of the current of LED and its light emission are introduced respectively,the following study show that the latter method is more easily and accurately. Second, to calibrate the single photon counter, a LED low light source are used by control it’s current with constant current source, thanks to the great dynamic range of photon counter, it’s calibrated by a weak light radiometer finally. Experimental results shows that the core device of the photon counter-PMT and it’s high voltage power supply is not stable, the photon counter can be test and calibrated frequently. So it’s a nice solution that a photon counter can be calibrated conveniently by the LED weak standard light source.