Recently, methods based on all-optical pulse rate multiplication have emerged to overcome the limitation of standard RF synthesiser for the generation of high frequencies. Among them, Frequency Shifting Loops (FSLs) injected by a CW laser, so called Talbot lasers, can generate pulse trains with a repetition rate tunable over several order of magnitudes (up to tens of GHz) from a low frequency synthesiser . Until now, Talbot lasers have been theoretically described in the frame of a passive cavity in the steady state. Here, we present a simple model based on rate equations dedicated to the dynamics of Talbot lasers. This model allows to successfully explain experimental results with both solid-state and semi-conductor gain media, without parameter adjustment.
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