抄録
Waveforms of an ArII laser excited by the discharge of a square current pulse have been observed. The onset of laser oscillations is delayed by τD relative to the start of the current pulse; τD decreases with increasing discharge current. These results can be explained by solving the rate equations for a simplified four-level model in which radiation trapping and the variation of ion temperature at the initial stage of discharge are considered. Changes of waveform with the discharge current is also explained on the basis of the difference in the excitation mechanism for upper levels and that for lower levels.
