The EMCCD technology :
(EMCCD (or EM-CCD) = Electron Multiplying (EM) CCD)
EMCCD Gain :
In Texas Instruments™ EMCCD Gain is achieved by applying multiplication pulses to especially designed gates that activates the Charged Carrier Multiplication (CCM).
EMCCD Gain is adjusted depending on the amplitude of multiplication pulses.
Electron Multiplying CCD
EMCCD
Impactron
photon counting camera
visible band camera using EMCCD and x-ray cameras