title: Measurement of net group and reshaping delays for optical pulses in dispersive media.
abstract: We experimentally demonstrate the direct measurement of net group and reshaping delays for arbitrary optical pulses in dispersive media, verifying the earlier prediction of Peatross et al. [Phys. Rev. Lett. 84, 2370 (2000)]. Incoherent pulse propagation in an absorptionless system is well described by net group delay; even the medium causes a great deal of deformation in the transmitted pulse. However, in the case of phase modulated chirping pulses in a resonant absorber, the so-called superluminal or subluminal propagation velocity is strongly influenced by the reshaping delay.
authors.affiliation: Department of Physics, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
authors.forename: Aminul I
authors.initials: AI
authors.lastname: Talukder
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Haruta
authors.forename: Makoto
authors.initials: M
authors.lastname: Tomita