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A multiple laser operation in blue, green and orange spectral regions (3-colors) due to whispering-gallery mode (WGM) using dye-doped liquid spheres, by UV N2 laser pumping, was achieved. A technique of forming liquid spheres with stable droplet-size and fundamental characteristics concerning the energy-transfer effects in dye mixtures are also presented.

The significant effect of fat emulsion intralipid-10% mixing on lasing behaviors of liquid microdroplets was studied using rhodamine 6G dye. This highly scattering medium allows one to make the high-gain laser dye-soft scatterers microsystems that can provide well-defined lasing threshold and one-order or more magnitude enhancement of emission intensity with suitable (optimum) conditions of the mixing ratio, in comparison with original neat-dye lasing microdroplets. We also present and discuss the measured results of input–output intensities for different dye concentrations and dye-intralipid mixing ratios, and microscope images of spatial distribution of emission from both the microdroplets containing neat-dye and dye-intralipid mixture.