Experimental and numerical study demonstrates efficient sub-100-fs pulse amplification in a tandem core-pumped fiber system, highlighting pathways for high-power ultrafast lasers.
Key Points
To develop and evaluate a high-efficiency tandem core-pumped ytterbium-doped fiber amplifier capable of high-power scaling for sub-100-femtosecond broadband optical pulses.
Constructed an experimental tandem core-pumped ytterbium-doped fiber amplifier system utilizing high-brightness, low-quantum-defect pumping.
Conducted numerical simulations to investigate dynamic gain, nonlinear pulse propagation, and gain-managed nonlinear amplification of narrowband seed pulses.
Achieved an average output power of 27.7 W at a 171 MHz repetition rate with a slope efficiency of up to 91.2%.
Compressed the amplified optical pulses down to 75 fs duration.
Numerically validated that combining tandem core-pumping with gain-managed nonlinear amplification enables direct spectral broadening and power scaling of low-energy narrowband seeds into near-transform-limited pulses.