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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 19617–19628

Femtosecond two-photon absorption measurements based on the accumulative photo-thermal effect and the Rayleigh interferometer

Luis Rodriguez, Hyo-Yang Ahn, and Kevin D. Belfield  »View Author Affiliations

Optics Express, Vol. 17, Issue 22, pp. 19617-19628 (2009)

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A rapid, straightforward method for measuring the two-photon absorption cross sections in liquid samples based on both the accumulative photo-thermal effect and the Rayleigh interferometery is described and demonstrated. This technique combines the sensitivity of the thermal lens approach and the accuracy of interferometry techniques. Focusing a high repetition rate laser beam in the sample, generating a localized change in its refractive index, induces the photo-thermal phase shift. By recording and processing two interference patterns, this technique allows the rapid estimation of the two-photon absorption cross section of the sample. Significantly, the experimental results demonstrate that this new method can be used with both fluorescent and non-fluorescent samples.

© 2009 OSA

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.4870) Nonlinear optics : Photothermal effects
(260.3160) Physical optics : Interference
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6410) Spectroscopy : Spectroscopy, multiphoton

ToC Category:
Nonlinear Optics

Original Manuscript: August 25, 2009
Revised Manuscript: October 8, 2009
Manuscript Accepted: October 9, 2009
Published: October 15, 2009

Luis Rodriguez, Hyo-Yang Ahn, and Kevin D. Belfield, "Femtosecond two-photon absorption measurements based on the accumulative photo-thermal effect and the Rayleigh interferometer," Opt. Express 17, 19617-19628 (2009)

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