Polarization-maintaining amplifier employing double-clad bow-tie fiber.
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.
Kliner
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DA
Koplow
J P
JP
Goldberg
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L
Carter
A L
AL
Digweed
J A
JA