Abstract
In this paper, we demonstrate a fiber-coupled green laser module based on multiple 1-W continuous-wave TO-can-packaged green laser diodes (LDs). Theoretically, we calculated the maximum number of the LDs that can be incoherently combined and effectively coupled into a given optical fiber using spatial and polarization beam combination technologies. Experimentally, we combined as many as 40 collimated green LDs and then coupled the combined beam into an optical fiber with a core diameter of 200-μm and a numerical aperture (NA) of 0.22. The coupling efficiency is as high as 94 % and a total output power of 27.6-W can be obtained, which corresponds to an electro-optic efficiency of 9.8 %.
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