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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 57, Iss. 11 — Nov. 1, 2003
  • pp: 1317–1323

Femtosecond Broadband Stimulated Raman: A New Approach for High-Performance Vibrational Spectroscopy

David W. McCamant, Philipp Kukura, and Richard A. Mathies

Applied Spectroscopy, Vol. 57, Issue 11, pp. 1317-1323 (2003)


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Abstract

Femtosecond stimulated Raman spectroscopy (FSRS) is a new technique that produces high-quality vibrational spectra free from background fluorescence. FSRS combines a narrow-bandwidth picosecond Raman pump pulse with an ~80 fs continuum probe pulse to produce stimulated Raman spectra from the pump-induced gain in the probe spectrum. The high intensity of the Raman pump combined with the broad bandwidth of the probe produces high signal-to-noise vibrational spectra with very short data acquisition times. FSRS spectra of standard solutions and solvents such as aqueous Na2SO4, aqueous KNO3, methanol, isopropanol, and cyclohexane are collected in seconds. Furthermore, stimulated Raman spectra can be obtained using just a single pump-probe pulse pair that illuminates the sample for only ~ 1 ps. Fluorescence rejection is demonstrated by collecting FSRS spectra of dyes (rhodamine 6G, chlorophyll a, and DTTCI) with varying degrees of fluorescence background and resonance enhancement. The high signal-to-noise, short data acquisition time, fluorescence rejection, and high spectral and temporal resolution of femtosecond stimulated Raman spectroscopy make it a valuable new vibrational spectroscopic technique.

Citation
David W. McCamant, Philipp Kukura, and Richard A. Mathies, "Femtosecond Broadband Stimulated Raman: A New Approach for High-Performance Vibrational Spectroscopy," Appl. Spectrosc. 57, 1317-1323 (2003)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-57-11-1317


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