We have investigated Ce3+ : Y3Al5O12 (YAG) as a model system for a 5d-4f solid-state tunable laser. This system has been chosen since YAG has been extensively studied as a laser host and good quality crystals are readily available. Despite providing apparently adequate conditions to achieve stimulated emission, we were unable to detect laser action in Ce3+ : YAG. We find, however, strong excited-state absorption in this material at the wavelengths of its fluorescence and we report on this excited-state absorption (ESA) here. This self-absorption may explain the failure of all attempts to obtain stimulated emission in this material and has serious implications for any attempt to develop a 5d4fn−1-4fn laser.
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Miniscalco et al. (1978) studied this question.
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