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Experimental setup for the measurement of time resolved spectrum with UV and EUV excitation.
The time profile of the EUV laser (solid line). The dotted line indicates the instrumental function. The pulse width of the EUV laser is at full width at half maximum (FWHM).
(Color) Photograph of a size ZnO crystal grown by hydrothermal method.
The time profile of the third harmonics of the laser (solid line). The dotted line indicates the instrumental function. The pulse width of the third harmonics is at FWHM.
(Color) Streak camera images and temporal profiles of the fluorescence from ZnO, which are excited by [(a) and (b)] EUV laser pulses and [(c) and (d)] UV laser pulses . The temporal resolution of this measurement is . The red lines in (b) and (d) are fitting functions. The observed profiles can be fitted by double exponential decays described as , as reported in Ref. 8. The fitting parameters for EUV excitation are , , , and , and for UV excitation are , , , and . The time constant and ratio of the two decay components are almost identical in both the excitation conditions.
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