Abstract

Terrace-microspheres of high-index glass (BaO-SiO2-TiO2 glass, nD=1.93) containing 0.3ppm of Nd3+ were used to investigate the interaction between Raman scattering due to a glass matrix and fluorescence due to Nd3+. The terrace-microspheres were pumped with a tunable CW Ti:sapphire laser (790nm830nm wavelength) for changing pumping wavelengths. With pumping in the 800830nm wavelength region, there was a spectral overlap between Raman scattering and Nd3+ fluorescence. Under such conditions, Nd3+ fluorescence works as a seeding and an amplifier of stimulated Raman scattering (SRS), resulting in SRS enhancement. With pumping of 20mW power at around 830nm wavelength, the terrace-microspheres showed the strongest SRS gain, 5–6 times of that of 790nm wavelength pumping. SRS thresholds of the terrace-microspheres were improved from 3mW (790nm wavelength pumping) to 0.3mW (830nm 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 (λ=840940nm).

© 2011 Optical Society of America

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