TY  - JOUR
AB  - © 2015 Optical Society of America. This work reports the mid-infrared emission properties around 2 ?m in Ho3+/Yb3+ codoped germanate glasses. The glass not only possesses good chemical durability and good thermal stability but also has high midinfrared transmittance around 2 ?m (90%). In addition, the glass possesses considerably low OH- content (20.45 ppm) and large spontaneous transition probability (103.38 s-1) corresponding to the Ho3+:5I7?5I8 transition. Moreover, the measured lifetime of Ho3+:5I7 level is as high as 7.68 ms, and the quantum efficiency at 2 ?m can reach 79.4%. The energy transfer processes of Yb3+:2F5/2 level and Ho3+:5I6 level were quantitatively analyzed according to the rate equation. Results indicate that the prepared germanate glass is a promising candidate for 2 ?m mid-infrared laser materials applications.
AU  - Cai, M
AU  - Zhou, B
AU  - Wang, F
AU  - Tian, Y
AU  - Zhou, J
AU  - Xu, S
AU  - Zhang, J
DA  - 2015/01/01
DO  - 10.1364/OME.5.001431
EP  - 1439
JO  - Optical Materials Express
PY  - 2015/01/01
SP  - 1431
TI  - Highly efficient mid-infrared 2 ?m emission in Ho<sup>3+</sup>/Yb<sup>3+</sup>-codoped germanate glass
VL  - 5
Y1  - 2015/01/01
Y2  - 2026/05/18
ER  -