We report a novel phenomenon in sodium-calcium-silicate glass doped with . Under irradiation with a femtosecond pulsed laser, strong blue emission centered at about could be observed. The spectral characteristics are similar to those pumped by ultraviolet photons. The log–log correlation between integrated emission intensity and pump power reveals that a two-photon absorption process is involved in the phenomenon. It is suggested that the presence of localized energy levels is responsible for the appearance of the blue emission. The results indicate that transition metal ions without d electrons play an important role in fields of optics when embedded into glass hosts.
© 2006 Optical Society of AmericaFull Article | PDF Article
Gina C. Jones and S. N. Houde-Walter
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