Abstract

Terrace-microspheres of high-index glass ($\mathrm{BaO}\text{-}{\mathrm{SiO}}_2\text{-}{\mathrm{TiO}}_2$ glass, $n_D=1.93$) containing $0.3\mathrm{ppm}$ of ${\mathrm{Nd}}^{3+}$ were used to investigate the interaction between Raman scattering due to a glass matrix and fluorescence due to ${\mathrm{Nd}}^{3+}$. The terrace-microspheres were pumped with a tunable CW Ti:sapphire laser ($790\mathrm{nm}–830\mathrm{nm}$ wavelength) for changing pumping wavelengths. With pumping in the $800–830\mathrm{nm}$ wavelength region, there was a spectral overlap between Raman scattering and ${\mathrm{Nd}}^{3+}$ fluorescence. Under such conditions, ${\mathrm{Nd}}^{3+}$ fluorescence works as a seeding and an amplifier of stimulated Raman scattering (SRS), resulting in SRS enhancement. With pumping of $20\mathrm{mW}$ power at around $830\mathrm{nm}$ wavelength, the terrace-microspheres showed the strongest SRS gain, 5–6 times of that of $790\mathrm{nm}$ wavelength pumping. SRS thresholds of the terrace-microspheres were improved from $3\mathrm{mW}$ ($790\mathrm{nm}$ wavelength pumping) to $0.3\mathrm{mW}$ ($830\mathrm{nm}$ pumping) due to the enhancement effect. The potential application for a multiwavelength Raman laser with a low threshold was demonstrated in the near-IR region ($\lambda =840–940\mathrm{nm}$).

© 2011 Optical Society of America

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