Abstract
By choosing the right composition of the rare-earth garnet crystals, it is possible to grow good optical quality large sized crystals with the rare-earth and transition ion concentrations varying over an extremely wide range. Using the processes of excitation transfer one can achieve considerable improvement of the energy performance characteristics of traditional lasers. A number of new schemes may also be possible /1/. Among such crystals there are, for example, the gallium garnet crystals doped with chromium and neodymium. Fig. 1 demonstrates the time evolution of the metastable state of neodymium for the YAG:Cr3+, Nd3+ and the gadolinium scandium gallium garnet (GSGG:Cr3+, Nd3+) crystals. The normalization was carried out for the population of neodymium excited in the self-absorption bands. It can be seen that in the case of the GSGG crystal the maximum value of population is about a factor of 4 higher /2/. It is caused by the effective Cr → Nd energy transfer in GSGG crystal. The constant of the transfer here is about one order of magnitude higher than the YAG crystal /3/.
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