Abstract
Preliminary studies on laser emission from individual ethanol (~30-μm radius) droplets doped with rhodamine 6G dye have been reported.1 Two striking features of this emission were (1) the existence of spectrally narrow peaks and (2) a substantially lowered lasing threshold. Both of these features are the result of optical feedback at specific resonant wavelengths, which occurs as a consequence of whispering gallery modes or more accurately morphology-dependent resonances of the internally generated fluorescence radiation.
© 1985 Optical Society of America
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