Required minimum cavity dispersion in stable, graphene mode-locked, Yb-doped fiber lasers
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We have numerically investigated the required minimum cavity dispersion (RMCD) for obtaining stable pulses in net normal dispersion, graphene mode-locked, Yb-doped fiber lasers (YDFLs). By solving the modified nonlinear Schrödinger equation, we have found that the value of the RMCD was mainly affected by the nonsaturable absorption losses in the graphene saturable absorber (SA), and when monolayer graphene was used as the SA, this value was less than that obtained using multilayer graphene as the SA. We have also found that monolayer graphene YDFLs were more suitable for generating high-power, narrow-width pulses than were multilayer graphene YDFLs.
KeywordsFiber laser Graphene saturable absorber Ultrashort pulse Cavity dispersion Nonsaturable absorption loss
This research was supported by grants from the National Natural Science Foundation of China (Grant numbers 11374089, 61605040, 11074065, and 61308016), the Hebei Natural Science Foundation (Grant numbers F2017205162, F2017205060, F2016205124, and F2012205076), the Science Foundation of Hebei Normal University (Grant number L2016B07), and the Graduate Scientific Innovative Foundation of Hebei Province Department of Education Fund (Grant number sj2016024).
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