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- W3049202733 abstract "• •Multi-wavelength ultrashort annular pulses are generated by femtosecond Bessel beam. • •The interference of dual Bessel beams enhances the annular beam's intensity. • •The cascaded resonant four-wave mixing is the annular beams’ generation mechanism. • •Ultrashort annular beam may have important applications in imaging and communication. Double femtosecond Bessel laser beams (fs-BLBs) are used to interact with UV-visible silica glass and ultrashort annular beams (ABs) with six different peak wavelengths in the visible and near-infrared range are simultaneously generated while the super-continuum emission is totally suppressed. Experimental results show that as the time interval Δ t between double fs-BLBs gradually approaches zero, the generation efficiency of the ABs increases and reaches the maximum at Δ t = 0. When Δ t equals ±18 fs, the intensity of the annular beam with a central wavelength of 605 nm decreases to half of its maximum. Compared with the case using single femtosecond Bessel laser beam, the ABs’ generation efficiency can be greatly enhanced due to the interference of double fs-BLBs. It is considered that the four-wave mixing (FWM) and corresponding cascaded parametric processes are responsible for the generation of these ABs, which can be confirmed by the numerical simulations. The colorful ABs have important applications in the imaging and communication fields, such as the stimulated emission depletion microscopy (STED), the high speed 3D live fluorescence imaging, and the multiplexing optical communications." @default.
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- W3049202733 date "2021-01-01" @default.
- W3049202733 modified "2023-10-16" @default.
- W3049202733 title "Multi-wavelength annular optical pulses generated by double interferent femtosecond Bessel laser beams in silica glass" @default.
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- W3049202733 doi "https://doi.org/10.1016/j.optlaseng.2020.106330" @default.
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