We demonstrate a femtosecond optical parametric oscillator based on two nonlinear crystals synchronously
pumped by a single ultrafast laser for efficient intracavity signal amplification and output power enhancement.
By deploying two identical MgO:PPLN crystals in a single standing-wave cavity, and two pump pulse trains of
similar average power from the same Kerr-lens-mode-locked Ti:sapphire laser, a minimum enhancement of
56% in the extracted signal power is achieved, with un-optimized output coupling, when temporal synchronization
between the two intracavity signal pulse trains is established, resulting in a corresponding enhancement of 49% in
pump depletion. Using intracavity dispersion control, near-transform-limited signal pulses with clean spectrum are
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