The investigation on van der Waals (vdW) heterostructures has been becoming an attractive research topic due to their unique electrical, optical and magnetic properties. VdW heterostructures are generally constructed by...
The novel vertically standing PtSe 2 film on transparent quartz was prepared by selenization of platinum film deposited by the magnetron sputtering method, and an Nd:LuVO 4 passively mode-locked solid-state laser was realized by using the fabricated PtSe 2 film as a saturable absorber. The X-ray diffraction pattern and Raman spectrum of the film indicate its good crystallinity with a layered structure. The thickness of PtSe 2 film is measured to be 24 nm according to the cross-section height profile of the atomic force microscope image. Highresolution transmission electron microscopy images clearly demonstrate its vertically standing structure with an interlayer distance of 0.54 nm along the c-axis direction. The modulation depth (ΔT ) and saturation fluence (Φ s ) of PtSe 2 film are measured to be 12.6% and 17.1 μJ∕cm 2 , respectively. The obtained mode-locked laser spectrum has a central wavelength of 1066.573 nm, with a 3 dB bandwidth of 0.106 nm. The transform limited pulse width of the mode-locked laser was calculated to be 15.8 ps. A maximum average output power of 180 mW with a working repetition rate of 61.3 MHz is obtained. To the best of our knowledge, this is the first report of the generation of ultrafast mode-locked laser pulses by using layered PtSe 2 as a saturable absorber.
A new mechanistic strategy of spatially confining lanthanide emitters inside a sensitizing sublattice was developed to enhance the multiphoton ultraviolet upconversion, showing great promise in frontier fields such as photocatalysis.
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