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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 38, Iss. 12 — Jun. 15, 2013
  • pp: 2050–2052

Coherent anti-Stokes Raman spectroscopy in the presence of strong resonant signal from background molecules

M. Bitter and V. Milner  »View Author Affiliations


Optics Letters, Vol. 38, Issue 12, pp. 2050-2052 (2013)
http://dx.doi.org/10.1364/OL.38.002050


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Abstract

Spectroscopy of molecular mixtures with broadband femtosecond laser pulses often involves simultaneous excitation of multiple molecular species with close resonance frequencies. Interpreting the collective optical response typically requires Fourier analysis of time-resolved signals. We propose and demonstrate an alternative method of separating coherent Raman scattering signals from two molecular components with neighboring vibrational modes. We exploit “silence windows,” which arise from coupling of the vibrational and rotational degrees of freedom in molecular dynamics. In silence windows, the detected signal stems solely from the minority species (here, CO2), while the strong resonant background from the dominant species (O2) is greatly suppressed.

© 2013 Optical Society of America

OCIS Codes
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(270.1670) Quantum optics : Coherent optical effects
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering

ToC Category:
Spectroscopy

History
Original Manuscript: February 14, 2013
Manuscript Accepted: May 1, 2013
Published: June 5, 2013

Citation
M. Bitter and V. Milner, "Coherent anti-Stokes Raman spectroscopy in the presence of strong resonant signal from background molecules," Opt. Lett. 38, 2050-2052 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-12-2050


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