Citation: | Li Weiwei, Huang Yizhong, Luo Zhengqian. Composite two-dimensional material GO-MoS2-based passively mode-locked Erbium-doped fiber laser[J]. Opto-Electronic Engineering, 2018, 45(10): 170653. doi: 10.12086/oee.2018.170653 |
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Overview: In recent years, mode-locked fiber lasers have attracted extensive attention owing to their wide applications, such as material processing, optical communications, medicine, range finding and scientific research. This is because of their unique and outstanding advantages such as high peak power, narrow pulse width, compactness, low cost, high beam quality and ease of maintenance. Compared to active mode-locked fiber lasers which require a built-in amplitude modulator in the cavity, passive mode-locked fiber lasers using saturable absorbers (SA) as an intensity modulator have become a hotspot due to their simpler structure and abundant mode-locked phenomena. Traditional saturable absorbers include metal doped crystals, SESAMs and carbon nanotubes. For fiber lasers utilizing metal doped crystals or SESAMs, it is difficult to achieve an all-fiber structure, and they are also usually costly. The carbon nanotubes are relatively simple to fabricate and also easy to be integrated optically, but they only operate in a relatively narrow band. Until 2004, Novoselovks et al. of the University of Manchester successfully fabricated few layers and single layer of graphene by mechanically stripping graphite. Since graphene was discovered, the two-dimensional materials have been used as SAs in fiber lasers. In addition to graphene, there is an endless stream of research on topological insulators, transition metal dichalcogenides, black phosphorus and so on. Among them, the transition metal dichalcogenides represented by MoS2 is a newly developed two-dimensional nanomaterial. The monolayer of MoS2 consists of three atomic layers with a layer of molybdenum atoms sandwiched by two layers of sulfur atoms, which has good thermal and chemical stability. Furthermore, few-layer MoS2 had been ambiguously verified to exhibit enhanced optical saturable absorption and can possess the stronger light-matter interaction. In this paper, for improving the performance and stability of MoS2 saturable absorber, graphene oxide (GO) as colloidal surfactant is used to exfoliate MoS2 bulk material for obtaining few-layer GO-MoS2 nano-flakes. Further research on few-layer GO-MoS2 saturable absorber to mode-lock erbium-doped fiber laser (EDFL) is then conducted. In the experiment, a stable mode-locked pulsed laser is achieved with a center wavelength of 1558 nm, a repetition rate of 7.86 MHz and a pulse width of 1.9 ps. When the pump power reaches 60.5 mW, the output power is 0.48 mW and the pulse peak power is calculated to be 32.1 W. This work shows that the new composite 2D material prepared by this method is beneficial to maintain the stability of few-layer MoS2 and increase the damage threshold of the MoS2 saturable absorber for passive mode-locking.
(a) The AFM image of GO; (b) The AFM image of GO-MoS2; (c) The height image of GO; (d) The height image of GO-MoS2; (e) The XRD image of GO-MoS2; (f) The Raman image of GO-MoS2
The saturable absorption characteristics of PVA-GO, PVA-MoS2 and PVA-GO-MoS2
The structure of GO-MoS2-based EDFL
The mode-locking characteristics of GO-MoS2-based EDFL. (a) Optical spectrum; (b) Pulse sequence; (c) Autocorrelation trace; (d) RF spectrum