Abstract

In models of nonradiative energy transfer applied to doped solid-state laser materials, the distance between excited donors and neighboring acceptors critically affects the calculated energy transfer rates. In the generally successful formulation of nonradiative transfer theory,¹ the donors and acceptors are taken to be distributed evenly throughout the crystal and are independent (uncorrelated) in position. We derive a general expression to treat donor-acceptor transfer rates for locally correlated donor-acceptor placement. Several specific cases appropriate to actual laser materials are (1) an excluded volume around a donor diminished in acceptor concentration and (2) an enhanced volume around a donor in which acceptors preferentially locate. Physical effects which can lead to such microscopic distributions are discussed.

© 1986 Optical Society of America