In this paper, we propose an optimized design of the picosecond MOPA fiber laser by using hybrid-doped Yb fibers. The detailed implementation is that high-doped gain fiber with relatively small fiber core is adopted in the low-power pre-amplifiers, thus the shortest fiber could be ensured and the thermal load is not so heavy. In the power amplifier stage, the normal-doped large mode area gain fiber is utilized, then the thermal effects can be minimized and the output beam quality could be ensured. The design simultaneously takes into consider the output beam quality, thermal load, nonlinear phase shift, pulse peak power of the picosecond fiber laser. With using the existed Yb-doped fibers, we demonstrate a high-power picosecond MOPA fiber laser with the proposed method. The average output power is up to 110 W, the total optical conversion efficiency is 63.2%. No stimulated Raman scattering, amplified spontaneous emission and residual pump light are observed in the output spectrum. The - 6 dB bandwidth of the output spectrum at the full output power is ~ 4 nm.

Date Published: 17 September 2013
PDF: 8 pages
Proc. SPIE 8904, International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications, 89040S (17 September 2013); doi: 10.1117/12.2033586

Published in SPIE Proceedings Vol. 8904:
International Symposium on Photoelectronic Detection and Imaging 2013: High Power Lasers and Applications
Andreas Tünnermann; Zejin Liu; Pu Wang; Chun Tang, Editor(s)