We experimentally demonstrate transitions between stably mode-locked and noise-like pulse states in a ytterbium-doped fiber laser controlled by adjusting the level of intracavity spectral filtering. In both regimes, Kerr spatial self-cleaning provides high-quality output beams. By using cavities with different lengths of graded-index fiber, we show that, in the mode-locked regime, a proper balance between chromatic and modal dispersion maximizes pulse compressibility. We compress 2.1-kW, 6.7-ps pulses down to 170 fs using an external grating pair, in good agreement with numerical simulations.
Transitions between mode-locked and noise-like pulsed states in a multimode fiber laser / Stefańska, K., Cecconi, V., Krupa, K., Zhou, L., Alvarez Chavez, J.A., Murdoch, S.G., Mangini, F., Wabnitz, S.. - In: OPTICS LETTERS. - ISSN 0146-9592. - (2026). [10.1364/OL.596945]
Transitions between mode-locked and noise-like pulsed states in a multimode fiber laser
Vittorio Cecconi
Co-primo
Investigation
;Katarzyna KrupaWriting – Original Draft Preparation
;Jose Alfredo Alvarez-ChavezMembro del Collaboration Group
;Stuart G. MurdochInvestigation
;Fabio ManginiPenultimo
Supervision
;Stefan WabnitzUltimo
Supervision
2026
Abstract
We experimentally demonstrate transitions between stably mode-locked and noise-like pulse states in a ytterbium-doped fiber laser controlled by adjusting the level of intracavity spectral filtering. In both regimes, Kerr spatial self-cleaning provides high-quality output beams. By using cavities with different lengths of graded-index fiber, we show that, in the mode-locked regime, a proper balance between chromatic and modal dispersion maximizes pulse compressibility. We compress 2.1-kW, 6.7-ps pulses down to 170 fs using an external grating pair, in good agreement with numerical simulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
