Mode-Locked Er-Doped Fiber Laser by Using MoS2/SiO2 Saturable Absorber

Lu Li,Wei Ren,Yonggang Wang,Sicong Liu,Ruidong Lv,Zhendong Chen,Jiang Wang

doi:10.1186/s11671-019-2888-z

Abstract

The two-dimensional (2D) layered material MoS2 has attracted numerous attentions for electronics and optoelectronics applications. In this work, a novel type of MoS2-doped sol-gel glass composite material is prepared. The nonlinear optical properties of prepared MoS2/SiO2 composite material are measured with modulation depth (ΔT) of 3.5% and saturable intensity (Isat) of 20.15 MW/cm2. The optical damage threshold is 3.46 J/cm2. Using the MoS2/SiO2 composite material as saturable absorber (SA), a passive mode-locked Er-doped fiber (EDF) laser is realized. Stable conventional soliton mode-locking pulses are successfully generated with a pulse width of 780 fs at the pump power of 90 mW. In the pump power range of 100–600 mW, another stable mode-locking operation is obtained. The pulse width is 1.21 ps and the maximum output power is 5.11 mW. The results indicate that MoS2/SiO2 composite materials could offer a new way for optical applications.

Highlights

Nonlinear optical materials, especially those with 2D structures, lay the foundations of optoelectronics development [1,2,3,4,5]
Characterization of MoS2/SiO2 Composite Materials As is shown in Fig. 2a, the prepared MoS2/SiO2 composite material is the brown color, indicating the MoS2 nanosheets are incorporated into the silica glass
The MoS2/SiO2 composite material is characterized by energy dispersive X-ray spectrometer (EDS)

Summary

Introduction

Especially those with 2D structures, lay the foundations of optoelectronics development [1,2,3,4,5]. Numerous novel 2D materials such as topological insulators [8, 9], transition metal dichalcogenide (TMD) [10,11,12,13,14], black phosphorus [15], MXene [16], bismuthene [17], metal–organic frameworks [18], and perovskite [19] have demonstrated broadband optical nonlinearities. These 2D materials are considered as the generation promising optical modulator materials [20, 21]. Recent works demonstrate that the MoS2 has better saturable absorption response than graphene by using an open-aperture Z-scan technique for ultrafast

Methods

Results

Conclusion