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Femtosecond pump/supercontinuum-probe setup with 20 kHz repetition rate
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup: (a) Layout of the laser system and of the experiment. (b) Schematic of the achromatic doubling. (c) Pump-probe set-up. P: Prism, PM: Off-axis parabolic mirror, M: Mirror, OM: Oscillating mirror, SM: Spherical mirror, PD: Photodiode, FC: Flow cell with sample, L: Lens, F: Multi-mode fiber.

Image of FIG. 2.
FIG. 2.

Spectra of the visible output of the TOPAS (dashed line, lower scale), and the spectrum obtained by achromatic doubling (solid line, upper scale). Both spectra were measured using a fiber-coupled spectrometer (Avantes).

Image of FIG. 3.
FIG. 3.

Signal to noise ratio for an ideal source, as a function of the number of detected photons, for a readout noise of 1, 10, 100, 1000, 2000, 10 000 electrons. The curves corresponding to the typical readout noise of a CCD and the detector we are using (Hamamatsu S11105) are plotted as dotted lines.

Image of FIG. 4.
FIG. 4.

Raw pump probe data obtained on aqueous [Fe(bpy)3]2+, pump at 400 nm, 50 nJ pulse energy, pump spot diameter 150 μm, probe spot was <100 μm. Sample conditions are the same as in Ref. 20.

Image of FIG. 5.
FIG. 5.

Single wavelength transient absorption trace taken from the data of Figure 4 (310 nm probe wavelength). The inset shows data points taken before time zero. Their scattering around zero is a measure for the noise due to instabilities of the probe beam and the readout noise of the detector.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Femtosecond pump/supercontinuum-probe setup with 20 kHz repetition rate