title: Ultraslow matched-pulse propagation in sodium vapor.
abstract: We have observed ultraslow propagation of matched pulses in a parametric amplifying hot sodium vapor. A fractional delay of more than 1 and a gain of 28 have been simultaneously achieved for a probe pulse of width 100 ns, accompanying a conjugate Stokes pulse with similar gain and delay under a strong coupling beam. The results are compared with the preceding work by Boyer et al. [Phys. Rev. Lett. 99, 143601 (2007)].
authors.affiliation: Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto-shi, Kumamoto 860-8555, Japan.
authors.forename: Junji
authors.initials: J
authors.lastname: Okuma
authors.forename: Nobuhito
authors.initials: N
authors.lastname: Hayashi
authors.forename: Akihiko
authors.initials: A
authors.lastname: Fujisawa
authors.forename: Masaharu
authors.initials: M
authors.lastname: Mitsunaga