Abstract
Effects of dispersion of SiO2 microparticles (SOP, 5.8 μm in diameter) into Rhodamine 6G-doped microsphere on photo-pumped laser emission have been investigated. The micro-particles with different refractive index dispersed in the microsphere scattered pump laser (337 nm) in the microsphere cavity. In the microsphere including SOP, emission peaks of lasing in whispering gallery mode (WGM) appeared when it was pumped at the energy density above the threshold of 0.6 mJpulse−1cm−2. And their full widths at half maximum (FWHM) of the peaks were about 0.5 nm. Threshold for laser emission in WGM from R6G/pH-SiO2/SOP was lower than that from the microsphere without SOP. It was demonstrated that microparticles dispersion into the microsphere cavity is clearly effective on reduction of the threshold for the WGM laser emission.
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