title: Generation of a sub-20-fs single optical pulse by four-wave Raman mixing using two Raman cells filled with molecular hydrogen.
abstract: To attempt to expand the spectral domain for pulse shortening, we generated several emission lines by stimulated Raman scattering and subsequent four-wave Raman mixing. The efficiency of generation of the Raman emission was improved by passing the beam through two Raman cells that were connected in series. The group-velocity dispersion induced by a Raman cell window and hydrogen was compensated for by means of a pair of chirped mirrors for pulse compression. By a phase lock of the emission lines in the process of four-wave Raman mixing, the pulse width was reduced from 114 to 17 fs in the second Raman cell.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. y-kida@cstf.kyushu-u.ac.jp
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Kida
authors.forename: Masahiro
authors.initials: M
authors.lastname: Matsuse
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Zaitsu
authors.forename: Totaro
authors.initials: T
authors.lastname: Imasaka