3 June 2005 Dynamics of thermal annealing of fibre gratings directly written by an infrared femtosecond laser
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Abstract
The inscription of fibre Bragg gratings using infrared femtosecond laser offers a number of advantages over conventional methods based on UV inscription. The refractive index modification in femtosecond inscription is independent on defect formation and therefore should not experiment the defect-related thermal decay of UV inscribed gratings. In this paper, the response to thermal annealing of fiber Bragg gratings inscribed using a tightly focussed femtosecond laser is investigated. Experimental results reveal a vastly improve thermal stability compared to gratings inscribed using conventional methods based on UV light. Erasure was not observed until temperatures in the range between 900°C and 1000°C. These devices are therefore particularly suited to work in hostile environments and as high temperature sensors.
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A. Martinez, I. Khrushchev, I. Bennion, "Dynamics of thermal annealing of fibre gratings directly written by an infrared femtosecond laser", Proc. SPIE 5825, Opto-Ireland 2005: Optoelectronics, Photonic Devices, and Optical Networks, (3 June 2005); doi: 10.1117/12.605551; https://doi.org/10.1117/12.605551
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