Abstract
Selection of the fundamental mode of an active large mode area “ribbon” fiber laser with core dimensions of 107.8 μm by 8.3 μm was produced by a transmitting Bragg grating (TBG) in a free-space resonator. The multimode performance of the original laser was characterized to have an of 11.3 with an absorbed power slope efficiency of 76%. With the TBG aligned to provide maximum diffraction efficiency for the fundamental mode, the improved to 1.45 at an absorbed power slope efficiency of 54% and enhanced the brightness by 5.1 times.
© 2014 Optical Society of America
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