Abstract
New large mode area Ytterbium-doped fiber (LMA-YDF) designs for 400µm clad laser oscillators are investigated. Designs are optimized to simultaneously overcome limitations of Stimulated Raman Scattering (SRS) and Thermal Mode Instability (TMI) within the limitations set by the industrial laser market. The optimization enable industrial fiber lasers operating at 1µm wavelengths to robustly provide > 2kW with single mode beam quality. 915 nm pumping and 976 nm pumping require different designs due to different thermal loads. Wavelength specific options are given for both that robustly increase power from the current state of the art 1-1.5kW to up to 2.3kW.
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