Dynamics of thermal annealing of fiber gratings directly written by an infrared femtosecond laser

A. Martinez*, I. Khrushchev, I. Bennion

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


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°. These devices are therefore particularly suited to work in hostile environments and as high temperature sensors.

Original languageEnglish
Article number31
Pages (from-to)222-229
Number of pages8
JournalProceedings of SPIE - International Society for Optical Engineering
Publication statusPublished - 15 Nov 2005

Bibliographical note

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  • Femtosecond inscription
  • Fiber Bragg gratings
  • Thermal annealing


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