Abstract
We report a new type of instability in XeCl discharge lasers. In contrast to the previously reported filamentation mode of instability that prematurely terminates the optical signal in KrF and XeCl lasers, XeCl fluorescence is observed to evolve from a constant amplitude pulse to a modulated waveform as the buffer gas pressure p, or the preionization delay time Δ t is increased. This mode of instability is apparently induced by the marginal level of preionization as p and Δ t increases. The possible mechanism of the instability is discussed.
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