Abstract
Visualization of IR radiation of a Tm:YLF laser at 1908 nm in PbF2 ceramic samples has been investigated. Luminescence spectra of the PbF2 samples doped with Нo3+ exhibited bands at wavelengths of 490, 545, and 650 nm (this red band is the strongest). It is established that at, a low laser intensity, the 5I5 and 5I6 levels are occupied mainly due to the ion–ion energy transfer.
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