Abstract
The laser induced fluorescence spectrum (LIF) of the LiYF<SUB>4</SUB>:Ho<SUP>3+</SUP> (YLF:Ho) single crystals, pumped by the molecular fluorine pulsed discharge molecular laser at 157.6 nm was obtained in the vacuum ultraviolet (VUV) and ultraviolet (UV) regions of the spectrum. The observed transitions originate from the levels and the edge of the 4f<SUP>9</SUP>5d electronic configuration and they are assigned to the 4f<SUP>9</SUP>5d yields 4f<SUP>10</SUP> interconfigurational transitions. The LIF spectra can be explained provided that phonon trapping is taking place within the Stark components of the 4f<SUP>9</SUP>5d electronic configuration. The absorption spectrum of the crystal samples in the VUV was obtained as well. The electric crystal field splits all the levels of the 4f<SUP>9</SUP>5d mixed configuration. We observed five main transitions between the ground level <SUP>5</SUP>I<SUB>8</SUB> of the 4f<SUP>9</SUP> electronic configuration and the Stark components of the levels of the 4f<SUP>9</SUP>5d electronic configuration in the spectral range between 118 - 158 nm, and four weaker transitions in the spectral range from 158 - 186 nm.
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