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5 November 2018 Intense broadband optical-vortex pulses generation using a hollow core fiber
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Intense broadband optical-vortex pulses are expected to introduce new phenomena in nonlinear optical physics. We experimentally demonstrate the acquirement of about 500μJ, 220nm bandwidth (650nm – 870nm), and 16fs vortex ultrashort pulses by using a hollow fiber compressor. The Gaussian beam from a Ti:sapphire laser system at 800nm/50fs is transformed into vortex beam by using a spiral phase plate (SPP) firstly. Then, the narrowband optical vortex beam is spectrally broadened based on SPM in a 50-cm long hollow core fiber (HCF) filled with Ar at 0.5 bar, which is dispersion compensated using chirped mirrors. The total pulse energy transform efficiency is up to 56%. It is also found that orbital angular momentum (OAM) can be transferred to the newly generated spectral components by SPM effect..
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Lei Lin, Peng Wang, and Jun Liu "Intense broadband optical-vortex pulses generation using a hollow core fiber", Proc. SPIE 10811, High-Power Lasers and Applications IX, 108111B (5 November 2018);

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