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Optical parametric oscillator pumped at ~one µm with intracavity mid-IR variation-frequency generation in OPGaAsWe report over a femtosecond optical parametric oscillator (OPO) for your deep-infrared (deep-IR) depending on the Kerr-lens-manner-locked Ti:sapphire laser because the pump source. By deploying a novel cascaded intracavity arrangement,