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We experimentally investigate four-wave mixing (FWM) in short (80 μm) dispersion-engineered slow light silicon photonic crystal waveguides. The pump, probe and idler signals all lie in a 14 nm wide low dispersion region with a near-constant group velocity of c/30. We measure an instantaneous conversion efficiency of up to 9dB between the idler and the continuous-wave probe, with 1W peak pump power and 6nm pumpprobe detuning. This conversion efficiency is found to be considerably higher (>10 ×doi:10.1364/oe.18.022915 pmid:21164630 fatcat:gecybp6e2fdazdiw563vafow2y