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Cavity-QED-enhanced stimulated visible emission was observed in 14--diam rhodamine-6G--ethanol droplets pumped by cw 514. 5-nm radiation. Use of droplets provides an excellent test of cavity QED theory for spherical geometries. The mode number and order of the spherical-cavity resonances responsible for the observed emission peaks were identified and their Q values calculated from Lorenz-Mie theory. By equating stimulated gain to calculated/measured cavity losses, it was determined that spherical-cavity Q's of only 10^3--10^4 lead to cavity QED enhancements in excess of 120 in the emission cross section of rhodamine 6G, consistent with theory.
Campillo et al. (1991) studied this question.