High temperature sensing with fiber Bragg gratings in sapphire-derived all-glass optical fibers.
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°C for more than 24 h without degradation in reflectivity.
Tino
T
Elsmann
Adrian
A
Lorenz
Nazila Safari
NS
Yazd
Tobias
T
Habisreuther
Jan
J
Dellith
Anka
A
Schwuchow
Jörg
J
Bierlich
Kay
K
Schuster
Manfred
M
Rothhardt
Ladislav
L
Kido
Hartmut
H
Bartelt