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Transient spectrometer for near-IR fluorescence based on parametric frequency upconversion
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View: Figures


Image of FIG. 1.
FIG. 1.

Scheme of the transient parametric fluorescence amplifier. BS: 5:1 beam splitter; SH1: -thick frequency-doubling BBO crystal; S1, S2: mechanical shutter; SC: -thick sample cell; NF: notch filter centered at ; CP: chopper; PA: -thick parametric amplification BBO crystal; FL: flat mirror.

Image of FIG. 2.
FIG. 2.

Spectra of the parametrically amplified fluorescence. (a) Comparison of the spectra of steady-state fluorescence spectrum of IR-140 (gray-solid line), transient fluorescence spectrum from directly amplified idler beam (dark-solid line), reconstructed spectrum from the amplified signal beam before deconvolution (dashed line), and the reconstructed spectrum after deconvolution (dotted line). (b) Comparison of the idler-to-signal frequency upconverted amplified fluorescence spectrum (solid line), the intentionally convoluted spectrum reconstructed from the IR idler spectrum (gray-solid line), and the corresponding deconvoluted spectrum from the signal (dotted line). Graphic inset: observed spectrum of the pump beam (open circle) and a line-shape fitting (solid line).

Image of FIG. 3.
FIG. 3.

Kinetic traces of the amplified fluorescence signal (, filled circles) and idler (, open circles) beams at the peak wavelength of the corresponding spectra together with the biexponential fitted the decay kinetics (solid lines).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transient spectrometer for near-IR fluorescence based on parametric frequency upconversion