A simple gating method for photomultipliers is presented. The very high cutoff efficiency of the gate, its linearity, and the absence of spurious effect are shown by measurements taken on a RCA 7265 tube by using a pulsed and a cw light source in the S‐11 spectrum. This method has been found to be very useful in experiments of molecular physics where a weak spontaneous radiation to be detected is associated with a very intense pulse of stimulated radiation arising from a laser induced, coherent excitation of the medium.