Polarization effect in impulsive rotational Raman scattering

We theoretically study rotational Raman coherence excited impulsively in a hydrogen-gas-filled hollow fiber by an fs pump pulse with an arbitrary ellipticity. The results of our simulations based on a rotationally invariant formalism show that the use of an elliptically polarized pulse leads to more efficient phonon excitation than that of a linearly or circularly polarized one. The phonon amplitude dramatically depends both on ellipticity and propagation distance. The passage of a probe pulse in this excited media leads to the generation of high-order Raman sidebands in the pulse