title: Measurement of the collision time of dense electronic plasma induced by a femtosecond laser in fused silica.
abstract: Electronic plasma induced by a focused femtosecond pulse (130 fs, 800 nm) in fused silica was investigated by use of pump-probe technology. Pump and probe shadow imaging and interferometric fringe imaging were combined to determine electronic collision time tau in the conduction band, and tau was measured to be 1.7 fs at an electron density near 5 x 10(19) cm(-3). The lifetime of the electronic plasma is also measured to be approximately 170 fs by use of the time-resolved shadow imaging technique.
authors.affiliation: State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.
authors.forename: Quan
authors.initials: Q
authors.lastname: Sun
authors.forename: Hongbing
authors.initials: H
authors.lastname: Jiang
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Zhaoxin
authors.initials: Z
authors.lastname: Wu
authors.forename: Hong
authors.initials: H
authors.lastname: Yang
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong