26 mJ, 130 W $Q$-switched fiber-laser system with near-diffraction-limited beam quality

Abstract

We demonstrate a $Q$-switched fiber laser system emitting sub-60 ns pulses with 26 mJ pulse energy and near-diffraction-limited beam quality ($M^2<1.3$). In combination with a repetition rate of 5 kHz, a corresponding average output power of 130 W is achieved. This record performance is enabled by a large-pitch fiber with a core diameter of 135 µm. This fiber allows for effective single-mode operation with mode field diameters larger than 90 µm even at average output powers exceeding 100 W.

©2012 Optical Society of America

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