Wavelength shifts of dye lasing in microdroplets: effect of absorption change.

With addition of an absorber to dye-doped microdroplets, an absorption-dependent blue shift in the lasing spectra has been observed. The better the spectral overlap between the absorption and the fluorescence spectra of the dye, the larger the blue shift. The experimental observations are explained by a simple model of dye lasing in an optical cavity that includes losses because of the absorber and radiation leakage.