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High temperature sensing with fiber Bragg gratings in sapphire-derived all-glass optical fibers

Authors
  • Elsmann, Tino
  • Lorenz, Adrian
  • Yazd, Nazila Safari
  • Habisreuther, Tobias
  • Dellith, Jan
  • Schwuchow, Anka
  • Bierlich, Joerg
  • Schuster, Kay
  • Rothhardt, Manfred
  • Kido, Ladislav
  • Bartelt, Hartmut
Publication Date
Jan 01, 2014
Source
Fraunhofer-ePrints
Keywords
Language
English
License
Unknown
External links

Abstract

A structured sapphire-derived all-glass optical fiber with an aluminum content in the core of up to 50 mol% was used for fiber Bragg grating inscription. The fiber provided a parabolic refractive index profile. Fiber Bragg gratings were inscribed by means of femtosecond-laser pulses with a wavelength of 400 nm in combination with a two-beam phase mask interferometer. Heating experiments demonstrated the stability of the gratings for temperatures up to 950 degrees C for more than 24 h without degradation in reflectivity.

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