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Thermal properties of fibre Bragg gratings inscribed point-by-point by infrared femtosecond laser

Thermal properties of fibre Bragg gratings inscribed point-by-point by infrared femtosecond laser

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Direct, point-by-point inscription of fibre Bragg gratings by an infrared femtosecond laser has been reported recently. Response of these gratings to annealing at temperatures in the range 500 to 1050°C is studied for the first time. Gratings inscribed by infrared femtosecond lasers were thermally stable at temperatures up to 900°C, representing a significant improvement in comparison with the ‘common’, UV-inscribed, gratings. Annealing at temperatures up to 700°C increased grating reflectivity.


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