File Name : figures1.jpg

Caption : figure s1. fs transient absorption spectrometer set up: amplified pulses from yb laser are split into two parts using a beam splitter (bs). one part is used to pump a tunable pump pulse. the other part is delayed in a delay stage, and then focused into a nonlinear medium (nm), where white light is generated. the generated probe light is overlapped with pump light in the sample. the chopper is periodically closing and opening the pump beam in order to take the probe intensity measurements of the excited and non-excited sample. the pump pulse power can be controlled using a neutral density filter (nd filter). in order to record excited state absorbance spectrum at different powers, a power meter was used right after the nd filter and just before the laser beam gets focused on the sample.