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Large two-photon absorptivity of hemoglobin in the infrared range of
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View: Figures


Image of FIG. 1.
FIG. 1.

A single-trial TPA measurement on rhodamine B ( in methanol) at shows the linearity of the sum-frequency signal with the pump beam power. Control data are collected with the rhodamine sample placed in the beam path but outside of the focal region.

Image of FIG. 2.
FIG. 2.

The two-photon absorptivity [Eq. (4)] of solutions of rhodamine 6G [panel (A)] and rhodamine B [panel (B)] in methanol is shown along with previously measured values by Sengupta et al. (Ref. 12), Tian and Warren (Ref. 13), and Oulianov et al. (20 and , respectively) (Ref. 14) In panel (B), the curve represents two-photon enhanced THG from a aqueous solution of rhodamine B (Ref. 19). The THG curve has been amplitude scaled.

Image of FIG. 3.
FIG. 3.

The two-photon absorptivity [Eq. (4)] of [panel (A)] and HbCO [panel (B)] is plotted (left-hand scale) along with the linear absorption coefficient (gray lines, right-hand scale) at twice the incident photon energy (upper wavelength scale). A statistically significant difference in the TPA of and HbCO is found at . Systematic uncertainties are not included in the error bars. The dark lines represent amplitude scaled, TPA resonance enhanced THG spectra of the same solutions (Ref. 19). The THG curves have been amplitude scaled.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large two-photon absorptivity of hemoglobin in the infrared range of 780–880nm