Highly coherent mid-IR supercontinuum by self-defocusing solitons in lithium niobate waveguides with all-normal dispersion

Hairun Guo, Binbin Zhou, Xianglong Zeng, Morten Bache

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We numerically investigate self-defocusing solitons in a lithium niobate (LN) waveguide designed to have a large refractive index (RI) change. The waveguide evokes strong waveguide dispersion and all-normal dispersion is found in the entire guiding band spanning the near-IR and the beginning of the mid-IR. Meanwhile, a self-defocusing nonlinearity is invoked by the cascaded (phase-mismatched) second-harmonic generation under a quasi-phase-matching pitch. Combining this with the all-normal dispersion, mid-IR solitons can form and the waveguide presents the first all-nonlinear and solitonic device where no linear dispersion (i.e. non-solitonic) regimes exist within the guiding band. Soliton compressions at 2 mm and 3 mm are investigated, with nano-joule single cycle pulse formations and highly coherent octave-spanning supercontinuum generations. With an alternative design on the waveguide dispersion, the soliton spectral tunneling effect is also investigated, with which few-cycle pico-joule pulses at 2 mm are formed by a near-IR pump. © 2014 Optical Society of America.
Original languageEnglish
JournalOptics Express
Issue number10
Pages (from-to)12211-12225
Publication statusPublished - 2014


  • Dispersions
  • Optical pumping
  • Refractive index
  • Supercontinuum generation
  • Waveguides
  • All-normal dispersions
  • Alternative designs
  • Lithium Niobate Waveguide
  • Quasi phase matching
  • Single-cycle pulse
  • Soliton compression
  • Tunneling effects
  • Waveguide dispersions
  • Solitons

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