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Plasma effects and the modulation of white light spectra in the propagation of ultrashort, high-power laser pulses in barium fluoride

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Abstract

We report the results of a study of white light generation in a 7.5 cm long crystal of a high band-gap material, barium fluoride, using ultrashort (<42 fs) laser pulses over a range of values of incident laser power that extend up to more than three orders of magnitude larger than the critical power for self-focusing (Pcr). We explore white light generation and the intensity and spectral distributions within filaments that are formed as a result of the interplay of self-focusing and plasma-induced defocusing. The onset of plasma effects occurs at power levels in excess of 7 GW for ultrashort pulses in BaF2. For incident power levels that are three orders of magnitude larger than the critical power, blue-shifting of the incident laser wavelength is observed in addition to asymmetric continuum generation. The blue shift enables us to estimate the temporal variation of the electron density in the plasma that is generated within the BaF2 crystal.

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Authors and Affiliations

  1. Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai, 400 005, India

    A.K. Dharmadhikari, F.A. Rajgara & D. Mathur

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  1. A.K. Dharmadhikari
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  2. F.A. Rajgara
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  3. D. Mathur
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Correspondence to D. Mathur.

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PACS

52.38.Hb; 42.65.Jx; 42.65.Tg; 33.80.Wz; 52.35.Mw

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Dharmadhikari, A., Rajgara, F. & Mathur, D. Plasma effects and the modulation of white light spectra in the propagation of ultrashort, high-power laser pulses in barium fluoride. Appl. Phys. B 82, 575–583 (2006). https://doi.org/10.1007/s00340-005-2121-x

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  • DOI: https://doi.org/10.1007/s00340-005-2121-x

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