Spectroscopie résolue en temps de la femtoseconde à la milliseconde

Abstract : The aim of the work was the development of a time-resolved pump-probe measurement system allowing temporal scanning from femtosecond to millisecond time scale. An original method for asynchronous optical sampling, named AD-ASOPS, was developed, patented, and is now undergoing the industrialization phase. The method can be applied to couples of lasers oscillating at arbitrary repetition rates, which is a novelty and opens up many experimental possibilities. Two specific set-ups were realized in the case of laser oscillators (MHz AD-ASOPS) or in the case of amplified laser systems (kHz AD-ASOPS). A feasibility study confirmed many application possibilities. Different tests were performed for a complete characterization and demonstrated a sub-picosecond time resolution of about 400 fs for temporal sampling windows only limited by the period of the pump laser.The implementation flexibility related to AD-ASOPS allowed a pump-probe experiment on biological samples (reaction centre of Rhodobacter Sphaeroides), by using a conventional Ti:Sapphire oscillator at 74.5 MHz as probe and a CPO oscillator at 5.1 MHz as pump. The multi-scale dynamics for returning to the fundamental state, from picoseconds to about fifty nanoseconds, could be recorded into only a few minutes of acquisition time with one test bench. The results are in agreement with the literature. Finally, a demonstration experiment of the kHz AD-ASOPS version was performed with two amplified laser systems, by comparison with Fourier transform spectral interferometry. A sub-picosecond time resolution was confirmed over 1 millisecond temporal window.
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Submitted on : Monday, January 12, 2015 - 4:26:47 PM
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Laura Antonucci. Spectroscopie résolue en temps de la femtoseconde à la milliseconde. Physique [physics]. Ecole polytechnique X, 2014. Français. ⟨tel-01094630v2⟩

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