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Stable arrangements of temporal solitons are reported for essentially every implementation of femtosecond fiber lasers. Their formation can be tracked with today’s real-time instrumentation. However, the underlying interaction mechanism frequently remained elusive and predictions of soliton separations in actual sources are often missing. Here, we present the experimental analysis of bound-state trajectories in a femtosecond Er:fiber laser and reveal the underlying universal coupling mechanism. We demonstrate all-electronic switching between two stable soliton molecules and the feasibility of tuning bound-state separations. The results are applicable to various ultrafast sources and may readily be adapted for generating femtosecond pulse pairs in spectroscopy and material processing.
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Georg Herink, Luca Nimmesgern, Cornelius Beckh, Hannes Kempf, Alfred Leitenstorfer, "Soliton molecules in femtosecond fiber lasers: universal coupling mechanism and electronic switching," Proc. SPIE PC11986, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications VII, PC1198605 (1 April 2022); https://doi.org/10.1117/12.2614007