Figure 8

Pulsed blinding of the SPD. (a) Click rate under blinding. For pulsed blinding, only the click rate within the blinding pulse is measured; outside the blinding pulse, the detector works in the normal photon counting mode with dark counts. Click rate under cw blinding is shown for comparison. (b) The blinding pulse of peak power P. (c) Oscillogram of detector output (70 ns long logic pulses of 1.5 V amplitude) when \(P = 49\text{ pW}\) is insufficient for blinding and causes a saturated click rate within the pulse. (d) At a higher \(P = 490\text{ pW}\), the click rate within the pulse drops significantly. (e) Detector is blinded within the pulse of \(P = 12.3\text{ nW}\)