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Optica Publishing Group
  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CJ_P23

Electronic vs Thermal Index Changes in Pulsed and CW Yb-doped Fiber Amplifiers

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Abstract

The pump/signal induced refractive index changes (RICs) could strongly affect the generation of light in fiber lasers and amplifiers. The RICs in cw or quasi-cw pumped rare-earth-doped optical fibers can be caused both by the thermal mechanisms (due to thermalization of the pumping energy) and a non-thermal effect due to population change of levels with a different polarizability (it can be described by Kramers-Kronning relation) [1-3]. Here we present the experimental study and theoretical analysis with the aim to compare the contributions of the thermal and electronic mechanisms to the RICs induced in the Yb-doped fiber amplifiers under different pumping conditions (cw or pulsed pumping) and amplifying signal behaviour.

© 2011 Optical Society of America

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