Powdered zinc oxide as a source of stimulated UV radiation

For the purpose of creation of a source of stimulated UV radiation investigations of UV radiation of powders and disordered films of zinc oxide manufactured by different methods were conducted. The samples were pumped by the 3rd harmonics of two-stage Nd: YAG-laser with pulse duration -10 ns. Maximum density of energy of pumping pulses was about 480 mJ/cm 2 . Spectra of spontaneous emission were registered at 300 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 for more than two orders of magnitude. Peculiarities of different samples lasing are demonstrated and discussed. Unfortunately we did not yet achieve lasing in the samples of disordered films investigated.