Abstract
The dependence of the stimulated emission from ZnO tetrapods on the excitation pulse duration was studied. In all cases, clear lasing modes with a width of 0.5–0.8 nm were observed. However, lasing thresholds were significantly different. The thresholds observed were 57 μJ/cm 2, 840 μJ/cm 2, and 4.2 mJ/cm 2 for 250 fs, 120 ps, and 6 ns excitation pulses, respectively. The same trends (a decrease of lasing threshold with a decrease of pulse duration) are observed in samples with different tetrapod densities, although the differences become less pronounced in higher tetrapod density samples where lasing from multiple tetrapods can occur.
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