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Optical parametric oscillator pumped at ~1 µm with intracavity mid-IR big difference-frequency era in OPGaAsWe report over a femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based upon the Kerr-lens-manner-locked Ti:sapphire laser since the pump resource. By deploying a novel cascaded intracavity arrangement, compris