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We demonstrate an all-fiberized mode-locked laser by employing Molybdenum Disulfide (MoS2) spin-coated onto a side-polished fiber (SPF) as an in-line saturable absorber. Single crystal MoS2 has been exfoliated via the Li intercalation method and then dispersed with large population of few-layer MoS2 nano-sheets in ethanol. Subsequently, a saturable absorber has been prepared using a relatively simple method: spin-coating the uniform MoS2 solution on the fabricated SPF without using any polymer or toxic procedure. Power-dependent transmission property of the prepared MoS2 nano-sheets on the SPF was experimentally analyzed, providing the feasibility to apply it as an efficient in-line saturable absorption behavior. By deploying the MoS2 SPF into a fiber laser cavity with finely tuned laser pump power and cavity dispersion, mode-locked pulses were obtained at anomalous and normal dispersion of the laser cavity. The self-started soliton pulses at the anomalous dispersion regime were generated with a spectral bandwidth of 9.96 nm at 1584 nm and a pulse duration of 521 fs. Moreover, by managing the dispersion to the normal regime, stable pulses at net-normal intra-cavity dispersion with 11.9 ps pulse duration were obtained with a spectral bandwidth of 18.2 nm at 1570 nm. The results prove the effectiveness of developing MoS2 saturable absorbers and applications for pulsed laser operation.

ieee photonics journal

Mode-Locked All-Fiber Lasers at Both Anomalous and Normal Dispersion Regimes Based on Spin-Coated <named-content content-type="math" xlink:type="simple"> <inline-formula> <tex-math notation="TeX">$\hbox{MoS}_{2}$</tex-math></inline-formula></named-content> Nano-Sheets on a Side-Polished Fiber

Mode-Locked All-Fiber Lasers at Both Anomalous and Normal Dispersion Regimes Based on Spin-Coated $\hbox{MoS}_{2}$ Nano-Sheets on a Side-Polished Fiber