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Proceedings Paper

Pulse shaping for background free broadband CARS
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Paper Abstract

We demonstrate that pulse shaping of a narrowband pulse can suppress the nonresonant background (NRB) contribution and retrieve resonant Raman signals efficiently in a broadband coherent anti-Stokes Raman scattering (CARS) spectrum. A pulse shaper prepares a probe pulse with two spectral components of differing phase. When the CARS fields generated by these two out-of-phase components are optically mixed, the NRB signal is greatly reduced while a resonant CARS signal survives with minimal attenuation. We discuss three model schemes for the interfering pulse components: (1) two pulses with different bandwidths and the same center frequency (ps-fs scheme); (2) two pulses with the same bandwidth and shifted center frequencies (ps-ps scheme); and (3) a pulse with different phases across the center frequency (fs(+/-) scheme). In all 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.

Paper Details

Date Published: 25 February 2009
PDF: 8 pages
Proc. SPIE 7183, Multiphoton Microscopy in the Biomedical Sciences IX, 71830Y (25 February 2009); doi: 10.1117/12.809102
Show Author Affiliations
Young Jong Lee, National Institute of Standards and Technology (United States)
Marcus T. Cicerone, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 7183:
Multiphoton Microscopy in the Biomedical Sciences IX
Ammasi Periasamy; Peter T. C. So, Editor(s)

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