15 September 2005 UV radiation of powdered ZnO pumped by nanosecond pulses
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Since the intrinsic lifetime of spontaneous recombination UV radiation in zinc oxide amounts less than ~200 ps it is of interest to obtain stimulated UV radiation of powdered ZnO with pumping pulses of nanosecond duration. This will clarify the possibility of quasi-continuous laser radiation in disordered media. At the same time this effect can open the way for working out a cathodoluminescent screen with narrow spectrum and short persistence time. Investigations of UV radiation spectra of powdered zinc oxide and some disordered films were conducted. The samples were pumped by 3-rd harmonics of the two-stage Nd:YAG-laser (λ=355 nm) with pulse duration ~10 ns. Maximum density of energy of pumping pulses was about 160 mJ/cm2. Spectra of spontaneous emission were registered at 300K and 77K. With some of our powdered samples we achieved lasing at 300K. The threshold values of pumping energy density occurred to be higher than that under picosecond pumping approximately for two orders of magnitude. Peculiarities of different samples lasing are demonstrated and discussed. In spectra of the ZnO films investigated at 300K UV band maximum is situated at ~382 nm, while in powders of ZnO this maximum was located at ~389 nm. Besides, in the films the long-wavelength part of the UV band broadens with increase of pumping power.
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V. M. Markushev, V. M. Markushev, M. V. Ryzhkov, M. V. Ryzhkov, Ch. M. Briskina, Ch. M. Briskina, H. Cao, H. Cao, L. A. Zadorozhnaya, L. A. Zadorozhnaya, L. E. Li, L. E. Li, E. I. Gevargizov, E. I. Gevargizov, L. N. Demianets, L. N. Demianets, } "UV radiation of powdered ZnO pumped by nanosecond pulses", Proc. SPIE 5924, Complex Mediums VI: Light and Complexity, 59240Z (15 September 2005); doi: 10.1117/12.615885; https://doi.org/10.1117/12.615885

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