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We demonstrate an efficient broadband difference frequency converter emitting carrier-envelope-offset-free seed pulses for chirped-pulse parametric amplification and pumped by a monolithic femtosecond Yb-doped fiber amplifier that simultaneously provides passive optical synchronization for an OPCPA pump pulse source.
In this paper, the author demonstrate a drastically simplified seeding/synchronization approach based on an environmentally stable muJ-energy 200-fs, 100-kHz Yb-doped fiber amplifier (YDFA). It generates a white light continuum in bulk sapphire, pumps a distributed fiber grating optical parametric amplifier (DFG OPA) and provides an optical seed compatible with most Nd and Yb ~1mum pump pulse amplifiers.
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