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Frequency-Shifted-Feedback Mode-Locked Fibre Lasers are not as common as SESAM-based or figure 8/9 mode-locked ultrafast fiber lasers. It is mainly because that type of lasers requires a frequency-shifter like Acousto-Optics Modulator (AOM) which increases the complexity of the system for similar operation. Here, we took benefit of the optical transmission modulation and wavelength shifting effects of the AOM to build a fiber laser that can operate at different repetition rates. Pulsed operation (100ps) at the fundamental repetition rate (3.5MHz) of the laser cavity as well as first and second harmonics regimes have been obtained and show stable behaviour over hours.
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Jean-Bernard Lecourt, Simon Boivinet, Yves Hernandez, "Frequency-shifted-feedback mode-locked fiber laser operating at different repetition rates," Proc. SPIE PC13003, Fiber Lasers and Glass Photonics: Materials through Applications IV, PC1300301 (20 June 2024); https://doi.org/10.1117/12.3017571