Abstract
The M2 value is a general metric to characterize the beam quality of the high power fiber lasers. In this letter, we demonstrated a near single-mode fiber amplifier with 2.04 kW output. To the best of the authors' knowledge, we present the first evolution of the beam quality as a function of the signal output power in a multikilowatt class fiber laser utilizing step-index large-mode-area fiber. The M2 parameter of was preserved at any power level without mode instability. What is more, the evolution of the beam quality and the mode field experimentally verifies the superior thermal-optical property of the high power fiber lasers compared with other bulk solid-state lasers because of their geometry of the gain medium.
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