Visible and near infrared up-conversion luminescence in Yb3+/Tm3+ co-doped yttria-alumino-silicate glass based optical fibers

EXAFS studies of the local structure of bismuth centers in multicomponent silica glass based optical fiber preforms

“…Bi-doped fibers co-doped with Al and Y may be efficient candidates for Bi-related NIR emission because of the highest known vibrational energy of the YAS (Y 2 O 3 -Al 2 O 3 -SiO 2 ) host glass, of about 950 cm −1 [18], which is less than the maximal vibrational energy (1100 cm −1 ) of silica glass [19]. This is similar to what happens with YAS-glass based Tm-Er and Tm-Yb co-doped fibers [18,20,21]. Y and Al were chosen as co-dopants due to the same valence of Al 3+ and Y 3+ and likelihood of the lattice structures of Al 2 O 3 and Y 2 O 3 oxides.…”

Efficient Near Infrared to Visible and Near‐Infrared Upconversion Emissions in Transparent (Tm3+, Er3+)‐α‐Sialon Ceramics

“…At higher Er concentration, energy transfer from Er 3+ to Tm 3+ becomes more and more efficient, thereby increasing the intensity at 803 nm emission. The very intense emission at 803 nm, which is usually observed in Yb 3+ /Tm 3+ co-doped systems, 39 is the strong evidence of energy transfer from Er 3+ to Tm 3+ in our a-Sialon system. It is emphasized here that even the green emission in E30 and red emissions in all co-doped samples are intense enough to be observed by the naked eye (see inset in Figure 5) at excitation laser power density as low as 1.16 W/cm 2 .…”

Fluorescence enhancement in Tm-Yb-Ag codoped fiber by super-radiance

“…The optical preforms are prepared by MCVD method associated with a suitable SD technique [5,6]. First, a mono core layer of unsinterred SiO 2 is deposited in the inside wall of the silica substrate tube at a temperature of 1475-1500 0 C. Doping of Tm, Yb, Al with/without Ag-nps is done.…”