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

: Elsmann, Tino; Lorenz, Adrian; Yazd, Nazila Safari; Habisreuther, Tobias; Dellith, Jan; Schwuchow, Anka; Bierlich, Joerg; Schuster, Kay; Rothhardt, Manfred; Kido, Ladislav; Bartelt, Hartmut

Postprint (1.7 MByte; PDF; )

Optics Express 22 (2014), Nr.22, S.26825-26833
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
femtosecond laser-radiation; regenerated gratings; inscription; pulses; silica; nm

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.