ABSTRACT: Upconversion luminescence (UCL) properties from Yb3+ doped and Tb3+/Yb3+ codoped high silica glasses excited by a 980nm laser diode are investigated. The ln–ln plots of the UCL intensity versus
laser power show abnormal relations: the slopes are larger than those reported in other papers. When tuning the laser power
up and down successively, intrinsic optical bistability of Yb3+ ions is observed at room temperature in the visible and infrared range without external cavity. And this nonlinear effect
induces the abnormal UCL phenomena.
Applied Physics B 04/2012; 98(2):261-265. · 2.19 Impact Factor