کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1496068 | 992953 | 2009 | 4 صفحه PDF | دانلود رایگان |
Bismuth-doped alkaline metal germanate glasses with infrared fluorescence covering the whole low loss wavelength region were developed. The infrared fluorescence centered around 1.31 μm with the full width at half maximum (FWHM) lager than 200 nm was observed in GeO2–R2O–Bi2O3 (R = Li, Na, K) glasses under an 808 nm LD excitation, whereby the fluorescence lifetime is longer than 400 μs. These results indicate that the glass material may have potential applications in broadband optical amplifiers. The intensity of the infrared fluorescence decreases with the increase in the optical basicity of the host glasses. It is suggested that the fluorescence in the near infrared region should be ascribed to the low valence state of bismuth such as Bi2+ or Bi+, because a higher optical basicity favors the higher valence state of the multivalence metal ions.
Journal: Optical Materials - Volume 31, Issue 6, April 2009, Pages 945–948