Elsmann, TinoTinoElsmannLorenz, AdrianAdrianLorenzYazd, Nazila SafariNazila SafariYazdHabisreuther, TobiasTobiasHabisreutherDellith, JanJanDellithSchwuchow, AnkaAnkaSchwuchowBierlich, JoergJoergBierlichSchuster, KayKaySchusterRothhardt, ManfredManfredRothhardtKido, LadislavLadislavKidoBartelt, HartmutHartmutBartelt2022-03-042022-03-042014https://publica.fraunhofer.de/handle/publica/23766610.1364/OE.22.026825A 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.enfemtosecond laser-radiationregenerated gratingsinscriptionpulsessilicanm621journal article