title: Simultaneous three-photon-excited violet upconversion luminescence of Ce3+:Lu2Si2O7 single crystals by femtosecond laser irradiation.
abstract: We found that Ce3+:Lu2Si2O7 single crystals could be excited at 800 nm by using a femtosecond Ti:sapphire laser. The emission spectra of Ce3+:Lu2Si2O7 crystals were the same for one-photon excitation at 267 nm as for excitation at 800 nm. The emission intensity of Ce3+:Lu2Si2O7 crystals was found to depend on the cube of the laser power at 800 nm, consistent with simultaneous absorption of three 800 nm photons. The measured value of the three-photon absorption cross section is sigma'3=2.44x10(-77) cm6 s2.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Dong
authors.forename: Jun
authors.initials: J
authors.lastname: Xu
authors.forename: Guangjun
authors.initials: G
authors.lastname: Zhao
authors.forename: Chenfeng
authors.initials: C
authors.lastname: Yan
authors.forename: Guoqing
authors.initials: G
authors.lastname: Zhou
authors.forename: Liangbi
authors.initials: L
authors.lastname: Su
authors.forename: Luyun
authors.initials: L
authors.lastname: Yang
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu
authors.forename: Lihuang
authors.initials: L
authors.lastname: Lin
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Liang
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu
authors.forename: Qiushi
authors.initials: Q
authors.lastname: Ren