Direct Amplification of Femtosecond Pulses in Ytterbium-Doped Fiber Amplifiers

Abstract

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.

Keywords:

• fiber optics amplifiers and oscillators
• lasers
• lasers fiber
• pulse compression
• ultrafast lasers
• ytterbium