Author/Authors :
Pinheiro، نويسنده , , A.S. and Freitas، نويسنده , , A.M. and Silva، نويسنده , , G.H. and Bell، نويسنده , , M.J.V. and Anjos، نويسنده , , V. and Carmo، نويسنده , , A.P. and Dantas، نويسنده , , N.O.، نويسنده ,
Abstract :
We report on optical investigation of phosphate glasses doped with Yb2O3. UV–Vis and FT-NIR optical absorption, photoluminescence, time-resolved photoluminescence and refractometry techniques are used. Cluster formation of Yb3+ was not observed as well as, no evidence of cooperative luminescence among Yb3+. An exponential decay of the 2F5/2 → 2F7/2 lifetime of ytterbium was found when the interionic distance decreases. The quantum efficiency and laser performance were also investigated. Relatively high figure of merit was found, 0.33 × 10−20 cm2 ms. The values of the minimum fraction of Yb3+ for minimum laser gain, pump saturation intensity and minimum absorbed pumping intensity were estimated.
