All-fiber all-normal-dispersion femtosecond laser with nonlinear multimodal interference based saturable absorber

Abstract

In this letter, we demonstrate the first all-fiber all-normal dispersion ytterbium-doped oscillator with nonlinear multimodal interference based saturable absorber capable to generate ultrashort dissipative soliton pulses. Additional to functioning as a saturable absorber, the use of multimode fiber segments between single mode fibers also ensures the bandpass filtering via multimode interference reimaging necessary to obtain dissipative soliton mode-locking. The oscillator generates dissipative soliton pulses at 1030 nm with 5.8 mW average power, 5 ps duration and 44.25 MHz repetition rate. Pulses are dechirped to 276 fs via an external grating compressor. All-fiber cavity design ensures high stability and $\sim$70 dB sideband suppression is measured in RF spectrum. Numerical simulations are performed to investigate cavity dynamics and obtained results well-matched with experimental observations. The proposed cavity presents an alternative approach to achieve all-fiber dissipative soliton mode-locking with a simple and low-cost design.

5 pages, 5 figures

References in corpus (5)

• Spatial beam self-cleaning in multimode fiber
• Observation of geometric parametric instability induced by the periodic spatial self-imaging of multimode waves
• Self-organized instability in graded-index multimode fibres
• Spatiotemporal Characterization of Supercontinuum Extending from the Visible to the Mid-Infrared in Multimode Graded-Index Optical Fiber
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Cited by in corpus (7)

• Spatiotemporal self-similar fiber laser
• Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: theory and experiments
• All-fiber spatiotemporally mode-locked laser with multimode fiber-based filtering
• Soliton-pair dynamical transition in mode-locked lasers
• All-fiber mode-locked ytterbium-doped fiber laser with a saturable absorber based on nonlinear Kerr beam cleanup effect
• Robust mode-locking in a hybrid ultrafast laser based on nonlinear multimodal interference
• Bandwidth-induced saturation in multimode fiber-based absorbers