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The time dependence of the laser output pulse at 337 μ in an acetone and nitrogen gas mixture has been studied using a fast indium antimonide detector. Current pulses from a line-type modulator were varied in length from 2 to 20 μsec with amplitudes from 50 to 180 A. The start of the laser output pulse occurred after the current pulse in the discharge was over, from 6 to 8 μsec after the end of the current pulse. These results indicate that, for the currents used, population inversion and the achievement of conditions allowing laser action, take from 6 to 8 μsec after the discharge ends to become established.