D Grobnic et al 2006 Meas. Sci. Technol. 17 1009 doi:10.1088/0957-0233/17/5/S12
D Grobnic, C W Smelser, S J Mihailov and R B Walker
Show affiliationsUsing an ultrafast Ti:sapphire 800 nm laser and a phase mask, fibre Bragg gratings (FBGs) with high thermal stability were fabricated in Ge-doped SMF-28 fibre for sensor applications and were subjected to long annealing tests at 1000 °C. FBGs that maintained more than 99.95% reflectivity after several hundred hours at this temperature are demonstrated. The gratings perform well in cycling experiments up to 1000 °C, and hysteresis in the wavelength response was not detected. At a temperature of 1050 °C, a permanent drift of the central wavelength is observed which is associated with a reduction of the grating strength. The capability of this new type of FBG to be used for high temperature sensors is discussed.
42.81.Wg Other fiber-optical devices
42.60.Lh Efficiency, stability, gain, and other operational parameters
Issue 5 (May 2006)
Received 18 July 2005, in final form 28 October 2005
Published 7 April 2006
D Grobnic et al 2006 Meas. Sci. Technol. 17 1009
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