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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 38, Iss. 22 — Nov. 15, 2013
  • pp: 4566–4569

Split-probe hybrid femtosecond/picosecond rotational CARS for time-domain measurement of S-branch Raman linewidths within a single laser shot

Brian D. Patterson, Yi Gao, Thomas Seeger, and Christopher J. Kliewer  »View Author Affiliations


Optics Letters, Vol. 38, Issue 22, pp. 4566-4569 (2013)
http://dx.doi.org/10.1364/OL.38.004566


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Abstract

We introduce a multiplex technique for the single-laser-shot determination of S-branch Raman linewidths with high accuracy and precision by implementing hybrid femtosecond (fs)/picosecond (ps) rotational coherent anti-Stokes Raman spectroscopy (CARS) with multiple spatially and temporally separated probe beams derived from a single laser pulse. The probe beams scatter from the rotational coherence driven by the fs pump and Stokes pulses at four different probe pulse delay times spanning 360 ps, thereby mapping collisional coherence dephasing in time for the populated rotational levels. The probe beams scatter at different folded BOXCARS angles, yielding spatially separated CARS signals which are collected simultaneously on the charge coupled device camera. The technique yields a single-shot standard deviation (1σ) of less than 3.5% in the determination of Raman linewidths and the average linewidth values obtained for N2 are within 1% of those previously reported. The presented technique opens the possibility for correcting CARS spectra for time-varying collisional environments in operando.

© 2013 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6780) Instrumentation, measurement, and metrology : Temperature
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(300.6290) Spectroscopy : Spectroscopy, four-wave mixing
(320.5390) Ultrafast optics : Picosecond phenomena

ToC Category:
Nonlinear Optics

History
Original Manuscript: September 12, 2013
Manuscript Accepted: October 1, 2013
Published: November 5, 2013

Citation
Brian D. Patterson, Yi Gao, Thomas Seeger, and Christopher J. Kliewer, "Split-probe hybrid femtosecond/picosecond rotational CARS for time-domain measurement of S-branch Raman linewidths within a single laser shot," Opt. Lett. 38, 4566-4569 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-22-4566

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