title: Temporal dynamics of two-photon-pumped amplified spontaneous emission in slab organic crystals.
abstract: We have studied the ultrafast dynamics of two-photon-pumped amplified spontaneous emission (ASE) from a single crystal by the time-resolved fluorescence upconversion technique. With the increase of two-photon pump intensities, the emission decay time is dramatically shortened by 30 times (from 3ns to approximately 87 ps), and the energy migration rate is acutely enhanced when ASE occurs. The stripe length is also found to play an important role in the formation of the ASE. Meanwhile, the gain coefficient is evaluated to be 15cm(-1) for 560nm at an excitation intensity of 2.3mJ/pulse/cm(2) by the variable stripe length technique.
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering,Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Hong-Hua
authors.initials: HH
authors.lastname: Fang
authors.forename: Qi-Dai
authors.initials: QD
authors.lastname: Chen
authors.forename: Ran
authors.initials: R
authors.lastname: Ding
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.forename: Yu-Guang
authors.initials: YG
authors.lastname: Ma
authors.forename: Hai-Yu
authors.initials: HY
authors.lastname: Wang
authors.forename: Bing-Rong
authors.initials: BR
authors.lastname: Gao
authors.forename: Jing
authors.initials: J
authors.lastname: Feng
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: Sun