2024-03-29T08:20:36Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/503592022-11-17T02:08:08Zhdl_2115_20045hdl_2115_139Ultrashort optical-vortex pulse generation in few-cycle regimeYamane, KeisakuToda, YasunoriMorita, Ryuji425We 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.Optical Society of AmericaJournal Articleapplication/pdfhttp://hdl.handle.net/2115/50359https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/50359/1/OE20-17_18986-18993.pdf1094-4087Optics Express201718986189932012-08-13enginfo:pmid/23038538info:doi/10.1364/OE.20.018986© 2012 Optical Society of Americapublisher