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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 3 — Mar. 1, 2007
  • pp: 544–552

Experimental observation and theoretical analysis of Raman resonance-enhanced photodamage in coherent anti-Stokes Raman scattering microscopy

Haifeng Wang, Yan Fu, and Ji-Xin Cheng  »View Author Affiliations


JOSA B, Vol. 24, Issue 3, pp. 544-552 (2007)
http://dx.doi.org/10.1364/JOSAB.24.000544


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Abstract

The photodamage in coherent anti-Stokes Raman scattering (CARS) imaging of spinal tissues is featured by plasma-induced myelin splitting and shockwaves. When the excitation is tuned on resonance with the symmetric CH 2 stretch vibration, the average point-scanning time to cause the photodamage is reduced by half. Similar Raman resonance-enhanced photodamage is also observed for a polymer film. The light–matter energy transfer in coherent Raman processes with both plane waves and focused excitation beams is analyzed to interpret this phenomenon. Our calculation indicates that at Raman resonance, a significant vibrational absorption in the material can be stimulated by the concomitant Raman gain and Raman loss processes due to high incident-field intensities under a tight-focusing condition. As a result, while the nonlinear damage induced by multiphoton absorption can be diminished in CARS microscopy owing to the use of near-infrared picosecond pulses, the coherent Raman-induced vibrational pumping is able to enhance the photodamage by assisting plasma generation in the material.

© 2007 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(190.5650) Nonlinear optics : Raman effect
(260.2160) Physical optics : Energy transfer

ToC Category:
Microscopy

History
Original Manuscript: May 12, 2006
Revised Manuscript: October 6, 2006
Manuscript Accepted: October 24, 2006
Published: February 15, 2007

Virtual Issues
Vol. 2, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Haifeng Wang, Yan Fu, and Ji-Xin Cheng, "Experimental observation and theoretical analysis of Raman resonance-enhanced photodamage in coherent anti-Stokes Raman scattering microscopy," J. Opt. Soc. Am. B 24, 544-552 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-3-544

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