Behavior of high-order stimulated Raman scattering in a highly transient regime

Journal Article · Fri Jul 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.013813· OSTI ID:20718424

Sali, Emiliano; Kinsler, Paul; New, G H.C.; Mendham, K J; Halfmann, Thomas; Tisch, J W.G.; Marangos, J P ^[1]

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1. Blackett Laboratory, Imperial College London, London SW7 2BW (United Kingdom)

We have investigated the behavior of high-order stimulated Raman scattering in a highly-transient regime. We demonstrate efficient collinear generation of vibrational sidebands in molecular hydrogen and methane using two-color pumping with pulses of duration {tau}{approx}100 fs tuned to a vibrational Raman transition. A Raman spectrum with a large bandwidth was observed, ranging from the IR to the UV. Under some conditions strong pump depletion was observed and up to five anti-Stokes sidebands were observed to have energies exceeding 10% of the transmitted pump pulse energies. A numerical simulation reproduces qualitatively and quantitatively the experimental results and allows us to explain key experimental features. The simulation also confirms that the molecular coherence in the medium is substantially increased by the two-color pumping and allows us to deduce values for the degree of material excitation. The use of this technique looks promising for efficient subfemtosecond pulse generation.

• OSTI ID: 20718424
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COLOR
EXCITATION
HYDROGEN
METHANE
MOLECULES
NUMERICAL ANALYSIS
PULSES
PUMPING
RAMAN EFFECT
RAMAN SPECTRA
SIMULATION
TRANSIENTS
VIBRATIONAL STATES