Two-photon-excited luminescence in a Tb3+ -doped lithium niobate crystal pumped by a near-infrared femtosecond laser.
Blue (487.6 nm), green (544.1 nm), yellow (582.1 nm), and red (623.6 nm) upconversion (UC) luminescences are achieved in a Tb(3+)-doped lithium niobate crystal when an 800 nm femtosecond laser is loosely focused onto the sample at room temperature. The relationship between UC luminescence intensity and the pump energy indicates that a two-photon excitation process is dominant in this UC luminescence phenomenon. The Tb(3+) sensitive temperature dependence of the luminescence intensity is demonstrated via an obvious reduction of luminescence intensity with durative laser irradiation.
Li
Ai-Hua
AH
Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, West Da-zhi St. 92 Harbin 150001, China.
Zheng
Zhi-Ren
ZR
Lü
Qiang
Q
Sun
Liang
L
Wu
Wen-Zhi
WZ
Liu
Wei-Long
WL
Yang
Yan-Qiang
YQ
Lü
Tian-Quan
TQ