Abstract
Two-dimensional (2D) layered Platinum Ditelluride (PtTe2), a novel candidate of group 10 transition-metal dichalcogenides (TMDs), which provides enormous potential for pulsed laser applications due to its highly stable and strong nonlinear optical absorption (NOA) properties. PtTe2 saturable absorber (SA) is successfully fabricated with firstly demonstrated the passively Q-switched laser operation within a Yb-doped fiber laser cavity at 1066 nm. Few layered PtTe2 is produced by uncomplicated and cost-efficient ultrasonic liquid exfoliation and follow by incorporating into polyvinyl alcohol (PVA) polymer to form a PtTe2-PVA composite thin film saturable absorber. The highest achieved single pulse energy is 74.0 nJ corresponding to pulse duration, repetition rate and average output power of 5.2 μs, 33.5 kHz and 2.48 mW, respectively. This work has further exploited the immeasurable utilization potential of the air stable and broadband group 10 TMDs for ultrafast photonic applications.
Highlights
Q-switching, a useful and very important technique, has been widely studied and applied in pulsed laser development over the past decades[1,2,3,4]
Tremendous research effort has been devoted to searching novel saturable absorber materials which accompany with high operation performance and simple SA fabrication method
Layered Transition metal dichalcogenide (TMD) is composed of stacked planar crystal accompany with a stoichiometry of MX2, where M and X stand for the group 4 to 10 transition metal and chalcogen atoms (S, Se, Te), respectively
Summary
After successful ultrasonic liquid exfoliation, the morphology, crystal lattice structure and chemical composition of the obtained PtTe2 nanosheets were characterized. The A1g is standing for the out-plane vibration modes of Ditelluride atoms These strong characteristic Raman peaks reveal that the fabricated PtTe2 nanosheets possess with good crystallinity. (resolution bandwidth: 20 Hz) and wavelength spectra has shown in Fig. 7(c–f) corresponding to the maximum output single pulse energy of 74.0 nJ. The highest achieved single pulse energy is 74.0 nJ which is well comparable with the output achieved by using other group 6 or 10 TMDs saturable absorber within the fiber laser system. This first demonstration proves the novel photonic applications of the newly developed 2D PtTe2 material
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