Bandwidth-induced saturation in multimode fiber-based absorbers

Abstract

Multimode fiber-based saturable absorbers enable mode-locking in lasers, generating ultrafast pulses and providing an exceptional platform for investigating nonlinear phenomena. Previous analyses in the continuous wave (CW) limit showed that saturable absorption can be obtained due to nonlinear interactions between transverse modes. We find experimentally that saturable absorption can be achieved thanks to the interplay of single-mode fiber nonlinearity and the wavelength-dependent linear transmission of the multimode fiber, even with negligible intermodal nonlinearities. We further show that even when intermodal nonlinearities are significant, the CW analysis may not be sufficient for long multimode fibers. Understanding the underlying mechanisms of multimode fiber-based saturable absorbers opens new possibilities for developing programmable devices for ultrafast control.

References in corpus (11)

• Sub 200fs pulse generation from a graphene mode-locked fiber laser
• Multimode Nonlinear Fiber Optics: Massively Parallel Numerical Solver, Tutorial and Outlook
• Nonlinear multimodal interference and saturable absorption using a short graded-index multimode optical fiber
• Bidirectional Soliton Rain Dynamics Induced by Casimir-Like Interactions in a Graphene Mode-Locked Fiber Laser
• All-fiber all-normal-dispersion femtosecond laser with nonlinear multimodal interference based saturable absorber
• Soliton-pair dynamical transition in mode-locked lasers
• Spectral Shaping in a Multimode Fiber by All-fiber Modulation
• All-fiber mode-locked ytterbium-doped fiber laser with a saturable absorber based on nonlinear Kerr beam cleanup effect
• Tutorial: How to build and control an all-fiber wavefront modulator using mechanical perturbations
• Mode-locked fiber laser with offset splicing between two multimode fibers as a saturable absorber
• Yb-doped all fiber picosecond laser based on grade-index multimode fiber with microcavity