Spectral broadening and temporal compression of ∼100 fs pulses in air-filled hollow core capillary fibers

C. Li, K. P.M. Rishad, P. Horak, Y. Matsuura, D. Faccio

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We experimentally study the spectral broadening of intense, ∼100 femtosecond laser pulses at 785 nm coupled into different kinds of hollow core capillary fibers, all filled with air at ambient pressure. Differently from observations in other gases, the spectra are broadened with a strong red-shift due to highly efficient intrapulse Raman scattering. Numerical simulations show that such spectra can be explained only by increasing the Raman fraction of the third order nonlinearity close to 100%. Experimentally, these broadened and red-shifted pulses do not generally allow for straightforward compression using, for example, standard chirped mirrors. However, using special hollow fibers that are internally coated with silver and polymer we obtain pulse durations in the sub-20 fs regime with energies up to 300 mJ.

Original languageEnglish
Pages (from-to)1143-1151
Number of pages9
JournalOptics Express
Volume22
Issue number1
DOIs
Publication statusPublished - 2014 Jan 13

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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