Abstract
A new mode control method is introduced in the linear cavity large-mode-area (LMA) fiber laser. In our experiment, the cavity mirror was replaced by a coated concave mirror which only reflects the lower order lasers propagating along the fiber axis. And the higher order modes of the multimode LMA fiber are suppressed according to the mode competition theory. The beam quality gets better at the expense of slope efficiency. Output power of 12Ws is obtained with M2 of 1.20, which is much better than the uncontrolled laser beam with M2 of 2.65.
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