Krishnaiah, K. V.; Jayasankar, C. K.; Venkatramu, V.; Luis, S. F. L.; Lavin, V.; Chaurasia, S.; Dhareshwar, L. J. (HP&SRPD;BARC)
Source
Applied Physics-B, 2013. Vol. 113 (4): pp. 527-535
ABSTRACT
Yb3+-doped fluorophosphate glasses were prepared by melt-quenching technique and characterized their spectroscopic properties to assess the laser performance parameters. The magnitude of absorption (emission) crosssections at 975 nm for all the studied Yb3+-doped glasses is found to be in the range of 0.29–1.50 X 10-20 (0.59–1.99 X 10-20 cm2) which is much higher than those of commercial Kigre QX/Yb: 1.06 X 10-20 (0.5 X 10-20 cm2) laser glass. The luminescence lifetimes of 2F5/2 level decrease (1.15–0.45 ms) with increase in Yb2O3 concentration (0.1–4.0 mol%). Effect of OH- content on luminescence properties of Yb3+ ions has also been investigated. The effect of radiative trapping has been discussed by using McCumber (McC) and Fuchtbauer– Ladenburge (F–L) methods. The product of experimental lifetimes and emission cross-sections for 0.1 mol% Yb2O3- doped glass is found to be 2.28 X 10-20 cm2 ms which indicates that the higher energy storage and extraction capability could be possible. The detailed spectroscopic results suggest that the studied glasses can be considered for high-power and ultrashort pulse laser applications.