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Dissection of dispersed off‐resonant femtosecond degenerate four‐wave mixing of O 2
Author(s) -
Knopp G.,
Radi P. P.,
Sych Y.,
Gerber T.
Publication year - 2011
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2921
Subject(s) - femtosecond , raman spectroscopy , mixing (physics) , laser , degenerate energy levels , optics , four wave mixing , raman scattering , chemistry , materials science , atomic physics , molecular physics , nonlinear optics , analytical chemistry (journal) , physics , chromatography , quantum mechanics
Abstract Simultaneous time and frequency detection in off‐resonant femtosecond degenerate four‐wave mixing (fs‐DFWM) experiments displays spectral features that are covered in standard, nondispersed, frequency‐integrated measurements. The application of laser fields with finite bandwidths, narrower than or comparable to the rotational Raman bands, affects the observed coherent signals. Information available from such experiments is split between the time and frequency domains and an improved measurement necessitates a combined detection. Rotational recurrences of oxygen (O 2 ), measured by dispersed fs‐DFWM at room temperature, exhibit spectral characteristics, using 800‐nm laser pulses with ∼100 fs duration. Analysis of the detected signals in both dimensions incorporating temporal and spectral trends can assist in the extraction and interpretation of chemicophysical quantities from the experiment. The dispersed recurrent signals are in accordance with simulations. Copyright © 2011 John Wiley & Sons, Ltd.