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Optics Letters

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  • Vol. 27, Iss. 18 — Sep. 15, 2002
  • pp: 1634–1636

Ultrafast measurement of two-photon absorption by loss modulation

Peifang Tian and Warren S. Warren  »View Author Affiliations


Optics Letters, Vol. 27, Issue 18, pp. 1634-1636 (2002)
http://dx.doi.org/10.1364/OL.27.001634


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Abstract

We demonstrate a direct and sensitive technique for measuring two-photon absorption (TPA). An intensity-modulated femtosecond laser beam passes through a sample exhibiting TPA. A TPA signal at twice the modulation frequency is then generated and subsequently measured by a lock-in amplifier. The absolute TPA cross section of Rhodamine 6G at 800nm is found to be (15.3±2.0)×10-50 cm4 s/photon and agrees well with previously published results obtained with much higher intensity [J.Chem.Phys.112, 9201 (2000)]. Our method may be especially useful in measuring nonlinear absorptions of nonfluorescent materials.

© 2002 Optical Society of America

OCIS Codes
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(190.4180) Nonlinear optics : Multiphoton processes

Citation
Peifang Tian and Warren S. Warren, "Ultrafast measurement of two-photon absorption by loss modulation," Opt. Lett. 27, 1634-1636 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-18-1634


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References

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  13. Equation 1 becomes P2F=(0.33Cdnp/tl f0)P21F when L> >Z0, indicating that the TPA signal is independent of the spot size.
  14. Both the experimental error (0.8 GM) and the uncertainty of the pulse temporal shape (15.3×12%=1.8 GM) contribute to the total error: 0.82+1.82=2.0 GM.
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