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Transient Yb2+ states the role of permanent Yb2+ states is discussed. Investigations on Yb:YAG single crystals grown in reducing atmosphere reveal that the magnitude of photocurrent is reduced by annealing the sample. This result points towards an involvement of permanent Yb2+ states in the photoconductivity mechanism. To further examine the influence of Yb2+-ions, samples with Si4+ co-doping are...
The fluorescence lifetimes of the 2F5/2 level of Yb3+ in LaSc3(BO3)4, Li6Y(BO3)3, Ca4YO(BO3)3, Ca4GdO(BO3)3, and YVO4 were determined for various doping concentrations applying the pinhole method.
We present spectroscopic results on Er:YAG at 300 K-550 K with respect to resonant pump absorption at 1.53 mum and laser emission at 1.61 mum and 1.64 mum and numerical results on laser performance.
The temperature dependent lifetimes, absorption, and emission spectra of an Er3+:YAG at 300–550 K are investigated and compared to the expected evolution using a theoretical description of the spectra. Population and linewidth dependent changes in the spectra can be separated, allowing conclusions on pump and laser efficiency at elevated temperatures. The temperature sensitivity of Er3+:YAG is for...
The photoconductivity of high Yb-concentration YAG and Y2O3 samples has been measured, confirming the occurrence of up-conversion in these materials. High intensity pumping reveals a very broad emission spectrum that exhibits avalanche behaviour.
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