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Absorption effects on microdroplet resonant emission structure

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Abstract

The effect of absorption on microdroplet resonance emission line intensities was studied in 15-μm-diameter Rhodamine 6G/ethanol solution droplets. Absorption was controlled by varying the concentration of the additive nigrosin. Spectrally integrated intensities of resonant features are found to be proportional to a droplet cavity mode efficiency Qa/(Qa + Qo) expressed in terms of cavity output coupling and absorption factors Qo and Qa, respectively. These Q’s are determined from linewidths calculated from Lorenz–Mie theory by using combinations of the real and complex indices of refraction. An experimental upper limit of Q for first-order modes was determined to be 108 from the data.

© 1991 Optical Society of America

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