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Transformation of strong picosecond pulses in radiation with an extended quasirotational spectrum during self-focusing in high-pressure hydrogen

  • Atoms, Spectra, Radiation
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Abstract

Radiation with a spectrum representing a discrete analog of the extended spectrum observed in the generation of a supercontinuum in gases is generated in the self-focusing of 30-ps pulses with a wavelength of 1.06 μ]m in hydrogen at pressures up to 120 atm. The spectrum contains lines with similar intensities, an average frequency spacing approximately equal to the rotational transition frequency in hydrogen (587 cm−1), and a smooth spatial profile. The lines consist of several vibrational-rotational components. As the pressure is increased, the spectral lines are transformed so that at a pressure above 60 atm each line in the spectrum contains one or two components formed as a result of the smaller number of cascade (rotational and vibrational) processes. Self-focusing is manifested in the occurrence of a radiating channel up to 12 cm in length. The formation of a channel of this length is associated mainly with the variation of the refractive index in vibrational excitation of the hydrogen molecules by electrons heated in the pump field.

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Authors and Affiliations

  1. International Science-Educational Laser Center, M. V. Lomonosov Moscow State University, 119899, Moscow, Russia

    V. B. Morozov, A. N. Olenin & V. G. Tunkin

Authors
  1. V. B. Morozov
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  2. A. N. Olenin
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  3. V. G. Tunkin
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Additional information

Zh. Éksp. Teor. Fiz. 115, 479–493 (February 1999)

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Morozov, V.B., Olenin, A.N. & Tunkin, V.G. Transformation of strong picosecond pulses in radiation with an extended quasirotational spectrum during self-focusing in high-pressure hydrogen. J. Exp. Theor. Phys. 88, 263–271 (1999). https://doi.org/10.1134/1.558793

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  • DOI: https://doi.org/10.1134/1.558793

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