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Bright and broadband coherent mid-IR radiation is important for exciting andprobing molecular vibrations. Using cascaded nonlinearities in conventionalquadratic nonlinear crystal like lithium niobate, self-defocusing near-IRsolitons have been demonstrated that led to very broadband supercontinuumgeneration in the visible, near-IR and short-wavelength mid-IR. Here we conductan experiment where a mid-IR crystal pumped in the mid-IR gives multiple-octavespanning supercontinua. The crystal is cut for noncritical interaction, so thethree-wave mixing of a single mid-IR femtosecond pump source leads to highlyphase-mismatched second-harmonic generation. This self-acting cascaded processleads to the formation of a self-defocusing soliton at the mid-IR pumpwavelength and after the self-compression point multiple octave-spanningsupercontinua are observed (covering 1.6-$7.0~\mu$m). The results were recordedin a commercially available crystal LiInS$_2$ pumped in the 3-$4~\mu$m range,but other mid-IR crystals can readily be used as well.

Multiple-octave spanning mid-IR supercontinuum generation in bulk quadratic nonlinear crystals