J4 ›› 2018, Vol. 35 ›› Issue (5): 594-602.

• Nonlinear Optics • Previous Articles     Next Articles

Laser intensity influence on up-conversion luminescence control in Dy3+-doped glass

LIU Pei1, CHENG Wenjing2, QI Dalong1, ZHENG Ye1, YAO Yunhua1, ZHANG Shian1   

  1. 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China; 2 School of Electronic & Electrical Engineering, Shangqiu Normal University, Shangqiu 476000, China
  • Received:2017-05-18 Revised:2017-05-30 Published:2018-09-28 Online:2018-09-29

Abstract:

he up-conversion luminescence of rare-earth ions is an important fundamental research for understanding the multi-photon excitation processes and up-conversion luminescence mechanisms. The up-conversion luminescence control of Dy3+-doped glass are investigated theoretically and experimentally by using square wave modulated femtosecond pulse as excitation light source. Results show that up-conversion luminescence has different control efficiency with the higher or lower laser intensity. The physical control mechanism is further investigated by considering the higher-order multi-photon absorption process, and the up-conversion luminescence multi-photon absorption includes two-photon and four-photon absorption process. The relative weight of four-photon absorption in the whole excitation process increases with increasing of laser intensity. Due to the destructive interference between two-photon and four-photon transition pathways, up-conversion luminescence exhibits different control behaviors at different laser intensity. At high laser intensity, the observation of higher-order multi-photon absorption processes in rare earth ions can provide a clear physical picture for understanding the up-conversion luminescence mechanism, and provide a new way for tuning the up-conversion luminescence.

Key words: quantum optics; up-conversion fluorescence; pulse shaping; coherent control; multi-photon absorption