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We report observation of stimulated emission from ZnO microtubes pumped by multiphoton absorption using intense femtosecond pulses at wavelength around 800nm. Band edge emission, together with second harmonic generation, was observed and several stimulated emission peaks with linewidths of 0.5–0.7nm appeared at high excitation fluence. The stimulated emission from the microtubes were attributed to the excitonic effect at intermediate fluence (50–100mJ∕cm2) and electron-hole plasma at high fluence (>100mJ∕cm2), respectively. Possible Fabry-Perot cavity effects were also discussed.
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Zhang et al. (2007) studied this question.
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