Abstract
Long-wavelength (660–740nm) coherent random lasing (RL) in slab waveguides consisting of poly(2-hydroxyethyl methacrylate) (pHEMA) incorporating silsesquioxane nanoparticles (POSS) doped with the red-emitting dyes LDS722 and LDS730 is presented. Energy transfer from a donor dye is used to overcome the inherent low pump (532nm) absorption of these dyes and to enhance the lasing efficiency of the samples. Rhodamine 6G is used as donor for LDS722 and Sulforhodamine B as donor for LDS730, in donor/acceptor molar proportions 3.3/6.6 and 1/9, respectively. RL emission spectral fingerprints and thresholds are studied in depth and insights into the RL characteristics are obtained from the Power Fourier Transforms of the emission spectra. Finally, photostabilities of LDS722 and, for the first time, of LDS730 doped into polymer slab waveguides are assessed.
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