Two-step upconversion luminescence in Yb:Tb:YSGG crystal

被引：32
作者：
Noginov, MA
Venkateswarlu, P
Mahdi, M
机构：
[1] Ctr. for Nonlinear Opt. and Mat., Department of Physics, Alabama A and M University, Normal, AL 35762
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 1996年 / 13卷 / 04期
关键词：
D O I：
10.1364/JOSAB.13.000735
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Multiline upconversion luminescence ranging from 375 to 635 nm was studied in Yb:Tb:YSGG crystal, a possible candidate for a tunable upconversion laser material. This luminescence was attributed to the transitions starting from the D-5(3) and D-5(4) excited levels of Tb. Two sequential steps in the upconversion were determined: at the first step Yb-Tb cooperative upconversion and cooperative absorption populate level D-5(4), and at the second step interaction of excited Yb and Tb (in the D-5(4) state) ions populates level D-5(3). At 500-mW Ti:sapphire pumping, the excited-state concentration of Tb ions exceeded 2% of Yb excited-state concentration. (C) 1996 Optical Society of America
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页码：735 / 741
页数：7
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