Two-dimensional palladium ditelluride: A novel saturable absorption material for ultrafast fiber lasers

摘要

In this work, two-dimensional few-layer palladium ditelluride (PdTe2) nanosheets are produced by the simple and effective ultrasonic liquid exfoliation method and used as novel saturable absorber in an Yb-doped modelocked fiber laser. The results show that the prepared flexible PdTe2/PVA composite film has a modulation of 3.7% and a saturation intensity of 77.6 MW/cm2. The obtained Yb-doped mode-locked fiber laser based on the film shows a pulse width of 887.2 ps with a repetition and central wavelength of 8.921 MHz and 1069 nm, respectively. So far, there has been few reports on PdTe2 as saturable absorbers to realize mode-locked fiber lasers. The results suggest that two-dimensional PdTe2 has great potential applications in nonlinear optics and ultrafast photonics.

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