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Optica Publishing Group
  • CLEO/Europe and IQEC 2007 Conference Digest
  • (Optica Publishing Group, 2007),
  • paper CJ_2

Core temperature measurement of an active optical fiber in lasing regime

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Abstract

The output power of a single-mode ytterbium fiber laser radiation (emission wavelength 1.06 pm) achieved 3 kW [1] for the input pump power of about 5 kW at pump wavelength 0.96 μm. The power defect of about 2 kW between pump and laser radiation caused heating of the core of an active fiber. In this case the temperature of active medium increased by hundreds of degrees. Strongly-inhomogeneous heating of the optical fiber modifies not only profile of refractive index, but also spectroscopy properties of active medium [2], such as absorption and emission cross-sections of Yb3+ ions, pump conversion efficiency, emission wavelength etc. To the best of our knowledge no experiments for core temperature measurement in the active optical fiber in lasing regime have been reported up to date.

© 2007 IEEE

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