We report a polarization-maintaining double-clad Yb-doped fiber amplifier employing bow-tie fiber. Borosilicate 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 >15 dB , independent of pump power, and the output power was as high as 3.5 W.
© 2001 Optical Society of America
Dahv A. V. Kliner, Jeffrey P. Koplow, Lew Goldberg, Adrian L. G. Carter, and Justin A. Digweed, "Polarization-maintaining amplifier employing double-clad bow-tie fiber," Opt. Lett. 26, 184-186 (2001)