Abstract
Summary form only, as given. Er2O2Ho3+ is an unusual laser material in that the host crystal itself provides the dominant pumping mechanism by means of energy transfer. The phenomenon of energy transfer between rare earth ions wherein the fluorescent intensity of one ion is enhanced by energy transfer from another ion has been investigated for the case of transfer from Er3+ to Ho3+ by Johnson et aL2s3 Erz03 is a rugged, refractory material which crystallizes with the type-C cubic rare earth sesquioxide structure. Substitution of other trivalent rare earths is easily effected without charge compensation. Erz03 is thus an ideal host for utilizing high concentrations.
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