Few-cycle solitons in short strongly phase-mismatched frequency conversion crystals

Details Few-cycle solitons in short strongly phase-mismatched frequency conversion crystals Few-cycle solitons in short strongly phase-mismatched frequency conversion crystals

2011-09-20

arxiv.org/abs/1109.4261v1

Physics

Optics

submitted

Scientific paper

We show that in strongly phase-mismatched nonlinear frequency conversion crystals the pump pulse can experience a negative cascaded Kerr-like nonlinearity that is large and always ultrafast. The large cascaded nonlinearity is ensured by using the largest quadratic nonlinearity in the crystal, and the strong phase-mismatch ensures an ultrafast nonlinearity. We verify this experimentally by showing few-cycle soliton compression with noncritical cascaded second-harmonic generation: Energetic 47 fs infrared pulses are compressed in a just 1-mm long bulk lithium niobate crystal to 17 fs (under 4 optical cycles) with 80% efficiency. Such ultrafast cascading is expected to occur for a broad range of pump wavelengths spanning the near- and mid-IR using standard nonlinear crystals.

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