Abstract
Multicolor deep-ultraviolet femtosecond pulses are generated in a spectral range of 220–300 nm with pulse energies exceeding 1 μJ. Pulses with shorter wavelengths are also generated with the shortest wavelength of 185 nm. These pulses are generated through cascaded four-wave mixing induced in hydrogen gas by use of three-color femtosecond pump pulses at 1200, 800, and 267 nm. The third pulse dramatically enhances the intensities of the multicolor deep-ultraviolet pulses. The cross-phase modulation induced by the two intense near-infrared pulses broadens the spectral width of each multicolor emission, resulting in a spectral width supporting a transform-limited duration shorter than 10 fs.
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This research was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant No. 23245017 and 26220806.
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Kida, Y., Sakamoto, K. & Imasaka, T. High-energy multicolor femtosecond pulses in the deep-ultraviolet generated through four-wave mixing induced by three-color pulses. Appl. Phys. B 122, 214 (2016). https://doi.org/10.1007/s00340-016-6493-x
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DOI: https://doi.org/10.1007/s00340-016-6493-x