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We demonstrate a robust, carrier envelope phase (CEP)-stable, potassiumtitanyl arsenate (KTA)-based optical parametric amplifier (OPA) delivering6-cycle (79 fs), 3.8-$\mu$m pulses at a 100-kHz repetition rate with an averagepower of 4.5 W. The pivotal achievement is stable generation of supercontinuum(SC) seed pulses in a YAG crystal with a rather long pulse of 1.4 ps; to ourknowledge, this is the longest duration for SC generation (SCG). Thistechnology offers a robust and simplified OPA architecture with characteristicsof passively-stabilized CEP, simplified dispersion management with bulkmaterials, wavelength tunability of the output pulses from 1.3-4.5 $\mu$m, andthe future power scaling up to kW-class based on Yb:YAG thin disk amplifiers.The total output power of 17 W (signal plus idler) is achieved and thecapability of this high photon flux aspect is successively demonstrated by itsapplication to high harmonic generation (HHG) in ZnSe crystals, with whichfaint yet novel signals above their bandgap are clearly observed.

White-light-seeded, CEP-stable, 4.5-W, 4-micron KTA parametric amplifier driven by a 1.4-ps Yb:YAG thin disk laser