Abstract
The spectral properties of the emission of a colloidal suspension of titanium dioxide particles in Rhodamine 640 perchlorate were studied systematically. The particle density , the dye concentration , and the energy of the pump pulse were varied over several orders of magnitude; the dependence of the spectra on these three parameters is discussed. We discovered a strong correlation between the particle density and the dye concentration. The amplification by stimulated emission was found to be strongest when the absorption length and the mean-free-path length had approximately the same magnitude. The respective values were determined by a pulsed transmission experiment.
© 1997 Optical Society of America
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