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.
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).
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.
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.
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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