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..
An all-reflective transient-grating based self-referenced spectral interferometry (TG-SRSI) device is proposed. Except for a thin transparent Kerr medium used for self-referenced pulse generation, no transmitted material used in the device, which enables few-cycle pulses characterization with center wavelength from ultraviolet to near infrared. An 800 nm/8.1 fs and an 1800 nm/14.3fs pulse are characterized successfully using this device which proves its ability
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