Abstract
We generated a 2.3-cycle, 5.9-fs, 56-μJ ultrashort optical-vortex pulse (ranging from ~650 to ~950 nm) in few-cycle regime, by optical parametric amplification. It was performed even by using passive elements (a pair of prisms and chirped mirrors) for chirp compensation. Spectrally-resolved interferograms and intensity profiles showed that the obtained pulses have no spatial or topological-charge dispersion during the amplification process. To the best of our knowledge, it is the first generation of optical-vortex pulses in few-cycle regime. They can be powerful tools for ultrabroadband and/or ultrafast spectroscopy and experiments of high-intensity field physics.
Highlights
Optical vortices attract growing attention during last decade because of their unique properties of carrying orbital angular momentum (OAM), possessing a dark hole and a phase singularity in the center
Spectrally-resolved interferograms and intensity profiles showed that the obtained pulses have no spatial or topological-charge dispersion during the amplification process
To the best of our knowledge, it is the first generation of optical-vortex pulses in few-cycle regime
Summary
Optical vortices attract growing attention during last decade because of their unique properties of carrying orbital angular momentum (OAM), possessing a dark hole and a phase singularity in the center. There are a variety of ways to generate optical vortices, such as combination of cylindrical lenses [11], a spiral phase plate [12, 13], a computer-generated hologram using liquid crystal spatial light modulator (LC-SLM) [3], and a uniaxial crystal [9, 14]. Most of these devices have serious limitations, in the bandwidth. We report the first generation of ultrashort optical-vortex pulses in few-cycle regime
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