Abstract
A ferromagnetic insulator Cr2Ge2Te6 as a saturable absorber in an Er-doped fiber laser (EDFL) was demonstrated. In this work, a CGT-PVA composite film was successfully fabricated using the liquid-phase exfoliation method and employed in an EDFL. The modulation depth and saturation intensity of the SA are 4.26% and 89.40 MW/cm2, respectively. Stable pulses with a minimum pulse width of 978.5 fs when the repetition rate was 3.25 MHz were recorded experimentally. Furthermore, stable solitons still need to be obtained when the pulse energy in the cavity is as high as 11.6 nJ. The results fully suggest that CGT has outstanding nonlinear absorption properties, which may have broad potential applications in ultrafast photons.
Highlights
Absorber Based on FerromagneticTwo-dimensional (2D) materials have exhibited a lot of interesting optical properties when their thickness is close to a few atomic layers
In 2009, graphene was applied as a saturable absorber (SA) in an Er-doped fiber laser (EDFL), and a 756 fs ultrashort pulse was obtained [7]
These resu that the Cr2 Ge2 Te6 (CGT)-SA was a necessary component in the EDFL
Summary
Two-dimensional (2D) materials have exhibited a lot of interesting optical properties when their thickness is close to a few atomic layers. Other 2D layered materials [25,26,27,28,29,30] with excellent saturable absorption have been adopted in ultrafast photonics. These two-dimensional materials have a similar layered structure, in that the layers are connected through van der Waals forces, which provides the possibility to obtain single or multiple layers from the bulk materials. The excellent performance of our EDFL indicates that CGT is a desirable candidate in ultrafast modulation
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