Abstract
Terrace-microspheres of high-index glass ( glass, ) containing of were used to investigate the interaction between Raman scattering due to a glass matrix and fluorescence due to . The terrace-microspheres were pumped with a tunable CW Ti:sapphire laser ( wavelength) for changing pumping wavelengths. With pumping in the wavelength region, there was a spectral overlap between Raman scattering and fluorescence. Under such conditions, fluorescence works as a seeding and an amplifier of stimulated Raman scattering (SRS), resulting in SRS enhancement. With pumping of power at around wavelength, the terrace-microspheres showed the strongest SRS gain, 5–6 times of that of wavelength pumping. SRS thresholds of the terrace-microspheres were improved from ( wavelength pumping) to ( 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 ().
© 2011 Optical Society of America
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