Phys. Rev. A 70, 031801(R) (2004) [4 pages]Self-compression of a femtosecond pulse due to Raman coherence of molecular rotations
We have observed self-modulation and self-compression of a femtosecond laser pulse after passing the beam through a Raman-active medium of hydrogen. Femtosecond pulses produce Stokes emissions of ortho-hydrogen and para-hydrogen, depending on the input beam conditions. The shape of the output pulses drastically changed as a function of the intensity of the Stokes emissions and the total width of the spectrum. This is attributed to nonlinear modulation of the wave form induced by coherent rotational motions of hydrogen molecules in the time domain. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.031801
DOI:
10.1103/PhysRevA.70.031801
PACS:
42.65.Re, 42.65.Dr
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