Abstract
Abstract Graphdiyne has an inborn band gap energy, where the minimal band gap is about from 0.46 to 1.22 eV, which shows great potential in ultrafast laser generation. In this work, we fabricate a graphdiyne-decorated microfiber and demonstrate its saturable absorption characteristics experimentally. This device is used as a saturable absorber to generate the conventional soliton and noise-like pulse in an erbium-doped mode-locked fiber laser. The conventional soliton with a spectral bandwidth of 2.45 nm can switch into noise-like pulse with 37.14 nm bandwidth by adjusting the pump power and the polarization controller. For the noise-like pulse, the mode-locked state has excellent stability with 2.17 nJ maximum pulse energy and 283 fs coherent peak duration. This work indicates that graphdiyne could be a remarkable nonlinear photonic device to explore the dynamics of various mode-locked pulses.
Highlights
Ultrafast fiber lasers have recently received rising interest owing to their narrow pulse duration, simple structure and low cost
We demonstrate that the GDY-coated microfiber composite structure can be used as a saturable absorption device to achieve the conversion between soliton pulse and noise-like pulses (NLPs) in the erbium-doped fiber laser cavity
By controlling the pump power and the polarization state, the absence of a mode-locking pulse indicates that the component does not contribute to the passively mode-locking in an erbium-doped fiber laser
Summary
Ultrafast fiber lasers have recently received rising interest owing to their narrow pulse duration, simple structure and low cost It has been widely used in industrial processing [1], medical treatment [2], biomaterials [3], nonlinear optics [4,5,6], and other fields [7, 8]. We demonstrate that the GDY-coated microfiber composite structure can be used as a saturable absorption device to achieve the conversion between soliton pulse and NLP in the erbium-doped fiber laser cavity. The maximum pulse energy reaches 2.17 nJ at 950 mW of pump power To our knowledge, this is the first time that NLP is generated in the anomalous dispersion region of GDY erbium-doped fiber laser
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