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1. Femtosecond Transient Absorption Spectroscopy

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   The Femtosecond Source
   The heart of any FTAS/) system is the ultrafast light source, almost universally a Ti:Sapphire (Titanium-doped Sapphire)/) oscillator operating near 800 nm with pulse durations between 20 fs and 200 fs. These oscillators generate trains of pulses at repetition rates typically between 80 MHz and 100 MHz. The spectral bandwidth $\Delta \lambda$ of these pulses is inversely proportional to their temporal duration $\Delta t$, governed by the [Fourier transfo…