Study of periodic amplitude fluctuations in a mode-lock Ytterbium fiber laser delivering 1 MHz pulse train

Simon Boivinet; Jean-Bernard Lecourt; Yves Hernandez

doi:10.1117/12.2621645

25 May 2022 Study of periodic amplitude fluctuations in a mode-lock Ytterbium fiber laser delivering 1 MHz pulse train

Simon Boivinet, Jean-Bernard Lecourt, Yves Hernandez

Proceedings Volume 12142, Fiber Lasers and Glass Photonics: Materials through Applications III; 121420P (2022) https://doi.org/10.1117/12.2621645
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

We propose here to study experimentally and numerically periodic amplitude fluctuations of a pulse train emitted by a 1030 nm all-PM fiber mode-locked laser. Nonlinear Polarization Evolution (NPE) permits to achieve the mode-locking operation. NPE only occurs along a long span of standard PM fiber located between an off-axis polarizer and a Faraday Mirror. In the rest of the cavity composed of an Ytterbium doped fiber and a chirped Fiber Bragg Grating, NPE does not occur because the light propagates only according to the slow axis of the fiber. When the mode-lock regime is established, the laser delivers a stable pulse train at a repetition rate of 1.01 MHz. Beyond a given pump power, a periodic amplitude fluctuation of the pulse train appears. This fluctuation has a period two times longer than the pulse train period: a pulse with high amplitude is always followed at the next round-trip by a pulse with smaller amplitude and this latter is followed by a high amplitude pulse and so on. It forms a so-called period doubling. The amplitude modulation increases with the pump power. If the pump power is further increased, then period quadrupling and then octupling are observed and an experimental bifurcation diagram is reported. A significant increasing of pump power leads to a route to chaotic amplitude variation.

Conference Presentation

Citation Download Citation

Simon Boivinet, Jean-Bernard Lecourt, and Yves Hernandez "Study of periodic amplitude fluctuations in a mode-lock Ytterbium fiber laser delivering 1 MHz pulse train", Proc. SPIE 12142, Fiber Lasers and Glass Photonics: Materials through Applications III, 121420P (25 May 2022); https://doi.org/10.1117/12.2621645

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