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Direct Amplification of Femtosecond Pulses in Ytterbium-Doped Fiber Amplifiers

Direct Amplification of Femtosecond Pulses in Ytterbium-Doped Fiber Amplifiers


We review three experiments of direct femtosecond pulse amplification in ytterbium-doped fiber amplifiers under increasingly nonlinear propagation conditions, starting from the parabolic regime. The temporal quality of generated compressed pulses is analyzed using frequency-resolved optical gating measurements. Linear or nonlinear compensation of third-order spectral phase allows the generation of clean sub-70 fs pulses with energies in the range of 100 nJ-1 μJ, at repetition rates above 10 MHz.
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