Abstract
SEVERAL authors have reported on the fluorescence line-spectra exhibited by certain rare-earth chelates, and suggested their relevance in the search for new laser systems1–4. Both europium and terbium chelates have been used in pulsed liquid–lasers operating at room temperature with input energy thresholds in the range of 200 to 2,000 J. The europium system operated on the 612 nm (orange) line of the chelate Eu(BTA)4Py (BTA = benzoyl trifluoroacetone, Py = pyrrolidine), whereas the terbium system, based on Tb(TFA)3 (TFA = trifluoroacetylacetone) gave an output in the green region at 547 nm (refs. 5–7).
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