Abstract
We demonstrate a linearly-polarized, ytterbium-doped fiber laser that uses an
uncoated, undoped ceramic YAG plate as the output coupler, and the corresponding
polarization extinction ratio of laser beam increases with incident pump power and
then saturates at larger pump power. For comparison, the output coupler of the fiber
laser is replaced by 10% reflectivity plane mirror, while the feature of the
polarization of laser output is kept unchanged. The results show that the origin of
the pump-dependent and self-started polarization is associated with the
intensity-dependent nonlinear birefringence in the gain fiber.
© 2012 Chinese Optics Letters
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