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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 7 — Aug. 1, 2013

Single-fiber-laser-based wavelength tunable excitation for coherent Raman spectroscopy

Jue Su, Ruxin Xie, Carey K. Johnson, and Rongqing Hui  »View Author Affiliations

JOSA B, Vol. 30, Issue 6, pp. 1671-1682 (2013)

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We demonstrate coherent Raman spectroscopy (CRS) using a tunable excitation source based on a single femtosecond fiber laser. The frequency difference between the pump and the Stokes pulses was generated by soliton self-frequency shifting in a nonlinear optical fiber. Spectra of CH stretches of cyclohexane were measured simultaneously by stimulated Raman gain (SRG) and coherent anti-Stokes Raman scattering (CARS) and compared. We demonstrate the use of spectral focusing through pulse chirping to improve CRS spectral resolution. We analyze the impact of pulse stretching on the reduction of power efficiency for CARS and SRG. Due to chromatic dispersion in the fiber-optic system, the differential pulse delay is a function of Stokes wavelength. This differential delay has to be accounted for when spectroscopy is performed in which the Stokes wavelength needs to be scanned. CARS and SRG signals were collected and displayed in two dimensions as a function of both the time delay between chirped pulses and the Stokes wavelength, and we demonstrate how to find the stimulated Raman spectrum from the two-dimensional plots. Strategies of system optimization consideration are discussed in terms of practical applications.

© 2013 Optical Society of America

OCIS Codes
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
(300.6450) Spectroscopy : Spectroscopy, Raman
(320.1590) Ultrafast optics : Chirping
(190.4223) Nonlinear optics : Nonlinear wave mixing
(180.5655) Microscopy : Raman microscopy

ToC Category:

Original Manuscript: February 20, 2013
Revised Manuscript: April 5, 2013
Manuscript Accepted: April 25, 2013
Published: May 27, 2013

Virtual Issues
Vol. 8, Iss. 7 Virtual Journal for Biomedical Optics

Jue Su, Ruxin Xie, Carey K. Johnson, and Rongqing Hui, "Single-fiber-laser-based wavelength tunable excitation for coherent Raman spectroscopy," J. Opt. Soc. Am. B 30, 1671-1682 (2013)

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