Abstract

Dy₃+-doped silica glass whispering gallery mode microspheres are fabricated by fiber fusion splicing. They present an almost ideal spherical morphology with a radius ranging from 60 to 67 µm as determined by confocal laser microscopy. The host composition of the microsphere is close to that of the fiber core. The dopant Dy₃+ ions are uniformly distributed across the microsphere as evidenced by µ-luminescence studies and present a luminescence lifetime of the 4F₉/2 state of 514.7 ± 1.1 µs indicating a weak luminescence quenching. The Dy₃+-doped glass microspheres were excited via evanescent field coupling using a half-tapered fiber and a blue 450-nm GaN laser diode (direct pumping scheme). The yellow fluorescence of Dy₃+ ions (the 4F₉/2 → 6H₁₃/2 transition) is filtered by the whispering gallery modes (free spectral range: 0.5 nm for 67-µm radius microsphere). The onset of stimulated emission is further observed highlighting the potential of such microresonators for narrow-linewidth light sources directly emitting visible light.

Abstract

Dy₃+-doped silica glass whispering gallery mode microspheres are fabricated by fiber fusion splicing. They present an almost ideal spherical morphology with a radius ranging from 60 to 67 µm as determined by confocal laser microscopy. The host composition of the microsphere is close to that of the fiber core. The dopant Dy₃+ ions are uniformly distributed across the microsphere as evidenced by µ-luminescence studies and present a luminescence lifetime of the 4F₉/2 state of 514.7 ± 1.1 µs indicating a weak luminescence quenching. The Dy₃+-doped glass microspheres were excited via evanescent field coupling using a half-tapered fiber and a blue 450-nm GaN laser diode (direct pumping scheme). The yellow fluorescence of Dy₃+ ions (the 4F₉/2 → 6H₁₃/2 transition) is filtered by the whispering gallery modes (free spectral range: 0.5 nm for 67-µm radius microsphere). The onset of stimulated emission is further observed highlighting the potential of such microresonators for narrow-linewidth light sources directly emitting visible light.

Abstract

Dy₃+-doped silica glass whispering gallery mode microspheres are fabricated by fiber fusion splicing. They present an almost ideal spherical morphology with a radius ranging from 60 to 67 µm as determined by confocal laser microscopy. The host composition of the microsphere is close to that of the fiber core. The dopant Dy₃+ ions are uniformly distributed across the microsphere as evidenced by µ-luminescence studies and present a luminescence lifetime of the 4F₉/2 state of 514.7 ± 1.1 µs indicating a weak luminescence quenching. The Dy₃+-doped glass microspheres were excited via evanescent field coupling using a half-tapered fiber and a blue 450-nm GaN laser diode (direct pumping scheme). The yellow fluorescence of Dy₃+ ions (the 4F₉/2 → 6H₁₃/2 transition) is filtered by the whispering gallery modes (free spectral range: 0.5 nm for 67-µm radius microsphere). The onset of stimulated emission is further observed highlighting the potential of such microresonators for narrow-linewidth light sources directly emitting visible light.

Abstract

Dy₃+-doped silica glass whispering gallery mode microspheres are fabricated by fiber fusion splicing. They present an almost ideal spherical morphology with a radius ranging from 60 to 67 µm as determined by confocal laser microscopy. The host composition of the microsphere is close to that of the fiber core. The dopant Dy₃+ ions are uniformly distributed across the microsphere as evidenced by µ-luminescence studies and present a luminescence lifetime of the 4F₉/2 state of 514.7 ± 1.1 µs indicating a weak luminescence quenching. The Dy₃+-doped glass microspheres were excited via evanescent field coupling using a half-tapered fiber and a blue 450-nm GaN laser diode (direct pumping scheme). The yellow fluorescence of Dy₃+ ions (the 4F₉/2 → 6H₁₃/2 transition) is filtered by the whispering gallery modes (free spectral range: 0.5 nm for 67-µm radius microsphere). The onset of stimulated emission is further observed highlighting the potential of such microresonators for narrow-linewidth light sources directly emitting visible light.