Abstract
We report on the complete fluorescence spectrum (52 transitions) and the full level system of neodymium ultraphosphate (NdUP) single crystals. Below 30 K the actual linewidths are below 0.1 Å indicating that there is one well defined site for all Nd ions which can be expected from a stoichiometric material. The position of the4I1 5/2 manifold does not allow for cross relaxation which explains the relatively long fluorescent lifetime of NdUP in spite of its high Nd-concentration. We find, however, lifetime shortening at high excitation rates which limits the optical gain of NdUP. We also find a very high rate of energy migration in NdUP which leads us to predict spontaneous single frequency oscillation for cw operation near threshold.
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Blätte, M., Danielmeyer, H.G. & Ulrich, R. Energy transfer and the complete level system of NdUP. Appl. Phys. 1, 275–278 (1973). https://doi.org/10.1007/BF00889775
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DOI: https://doi.org/10.1007/BF00889775