We extend a recent suggestion for the generation of subfemtosecond pulses by molecular modulation [Phys. Rev. Lett. <b>81,</b> 2894 (1998)] to the rotational spectrum of molecular hydrogen (H<sub>2</sub>) . When a rotational transition |a〉 → |b〉 is strongly driven (|ρ<sub>ab</sub> |=0.5) the generation and phase-slip lengths are of the same order and the Raman spectrum has approximately Bessel function sideband amplitudes. Numerical simulation predicts that this spectrum (generated in a 14-cm-long cell at 1-atm pressure of H<sub>2</sub>) will compress into a train of pulses with 94-fs pulse separation and a pulse length of 0.5 fs.
© 1999 Optical Society of America
(030.1640) Coherence and statistical optics : Coherence
(190.3100) Nonlinear optics : Instabilities and chaos
(320.0320) Ultrafast optics : Ultrafast optics
(320.5520) Ultrafast optics : Pulse compression
A. V. Sokolov, D. D. Yavuz, and S. E. Harris, "Subfemtosecond pulse generation by rotational molecular modulation," Opt. Lett. 24, 557-559 (1999)