Laser performance was studied for YAlO/sub 3/:Er and YAG:Er lasers that were excited with selective filtering of the pump light. In particular, the influence of the cross-relaxation process W was studied. The threshold energy for YAlO/sub 3/:Er is lower than for YAG:Er. This disparity is attributed to the differences in the lifetimes of the laser levels of the two crystals.>
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Breguet et al. (1992) studied this question.
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