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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 1 — Jan. 5, 2009
  • pp: 123–135

Single-shot interferometric approach to background free broadband coherent anti-Stokes Raman scattering spectroscopy*

Young Jong Lee and Marcus T. Cicerone  »View Author Affiliations

Optics Express, Vol. 17, Issue 1, pp. 123-135 (2009)

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We introduce a single-shot interferometric approach to suppress the nonresonant background (NRB) contribution to a broadband coherent anti-Stokes Raman scattering (CARS) spectrum; this single-shot approach is conducive to rapid imaging. A pulse shaper prepares a narrowband pulse with two spectral components of differing phase. When the CARS fields generated by these two out-of-phase components are optically mixed, NRB signal is greatly reduced while a resonant CARS signal remains with minimal attenuation. We discuss and demonstrate two model schemes for the interfering pulse components: (1) two pulses with different bandwidths and the same center frequency (ps-fs scheme) and (2) two pulses with the same bandwidth and shifted center frequencies (ps-ps scheme). In both schemes, only the resonant signal from the “3-color” CARS mechanism survives. The resonant signal from “2-color” CARS mechanism vanishes along with the NRB. We discuss optimization conditions for signal intensity and shape of resonant CARS peaks. Experimental CARS spectra of c-hexane and benzonitrile demonstrate feasibility of these approaches.

© 2009 Optical Society of America

OCIS Codes
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(320.5540) Ultrafast optics : Pulse shaping

ToC Category:

Original Manuscript: October 14, 2008
Revised Manuscript: November 28, 2008
Manuscript Accepted: December 4, 2008
Published: December 23, 2008

Young Jong Lee and Marcus T. Cicerone, "Single-shot interferometric approach to background free broadband coherent anti- Stokes Raman scattering spectroscopy," Opt. Express 17, 123-135 (2009)

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  24. Certain equipment is identified in this Letter to specify adequately the experimental details. Such identification does not imply recommendation by the National Institute of Standards and Technology, nor does it imply that the equipment is necessarily the best available for this purpose.
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