Abstract
We report a polarization-maintaining double-clad Yb-doped fiber amplifier employing bow-tie fiber. Borosili-cate stress elements were incorporated into the inner cladding of the fiber, yielding a beat length of 5.1 mm at 633 nm. When the fiber was pumped at 975 nm and seeded with linearly polarized light, the polarization extinction ratio was , independent of pump power, and the output power was as high as 3.5 W.
© 2001 Optical Society of America
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