High average power picoseconds fiber amplifier with 20 μm core YDF

• DOI: 10.7452/lapl.201210007
• Publication Date: 2012-05-11T10:02:48Z
• Authors: W Sun; H J Yu; L Zhang; Y Y Yang; Z H Han; Z Y Dong; W Hou; J M Li; X C Lin
• Keywords: 0211 other engineering and technologies; 02 engineering and technology

In this letter we report a simple single-stage amplifier realized as high as 62 W average power output at 1064 nm wavelength, 40 picoseconds pulse width and 80 MHz repetition from 0.7 W seed laser based on backward pumped master-oscillator fiber power amplifier (MOPA) system. It is can stable operation in 57.6 W output for hours. We applied a semiconductor saturable absorber mirror (SESAM) passive mode-lock Nd:YVO4 oscillator as seed source and 6m long 20 μm core double-cladding Yb-doped fiber (YDF) as gain medium. To the best of our knowledge, 62 W average power is the highest output of single-stage ps-pulse amplifier with 20 μm-core fiber. None amplified spontaneous emission (ASE) and stimulated Raman scattering (SRS) nonlinear phenomenon was observed in 57.6 W high average power output.