Abstract
The output photoluminescence was collected using a 10-cm lens and detected by a grating spectrometer or monochromator of 1 A spectral resolution (SPEX 750M), connected with a photomultiplier and a data scan [SPEX DS1010]. (Fig. 4a and 4b) The narrow emission bands presented in the article are detected again but from different samples indicating that they arise from the laser itself. Blue and blue-greenish upconversion luminescences are observed to the naked eye by excitation at 1046 nm of Nd:YAG laser pulses. Their pictures are presented below in Figs. 1a and 1b. The samples are located before the focus, where a breakdown in air is formed. Fig.1c pictures the samples’ luminescence upon exposed to a UV lamp. High photo-stability was again confirmed by continuously pumping the samples for two hours using a laser diode of photon energy 3.06 eV and power 200 mW. The detected output powers for both samples were decreased to an average of *65% of their initial values.
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