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Bandwidth-induced saturation in multimode fiber-based absorbers
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DOI：10.1364/OL.522418.png)
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Abstract
En 中文
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 multi- mode 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. (c) 2024 Optica Publishing Group
Keywords:
SMF-GIMF-SMF
SATURABLE ABSORBER
HYBRID STRUCTURE
BOUND SOLITONS
MODE-LOCKING
DISSIPATIVE SOLITONS
NO-CORE
LASER
INTERFERENCE
GENERATION