High-energy femtosecond Yb-doped all-fiber monolithic chirped-pulse amplifier at repetition rate of 1 MHz
Lv Zhi-Guo1, Teng Hao2, †, 
, Wang Li-Na2, Wang Jun-Li1, Wei Zhi-Yi1, 2, ‡,
, Wang Li-Na2, Wang Jun-Li1, Wei Zhi-Yi1, 2, ‡, Spectra of the pulses from (a) mode-locked seed source, (b) core-pumped energy preamplifier, and (c) cladding-pumped energy amplifier. The inset in panel (b) shows the spectrum from core-pumped single mode power preamplifier.
