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°. These devices are therefore particularly suited to work in hostile environments and as high temperature sensors.
| Original language | English |
|---|---|
| Article number | 31 |
| Pages (from-to) | 222-229 |
| Number of pages | 8 |
| Journal | Proceedings of SPIE - International Society for Optical Engineering |
| Volume | 5825 |
| DOIs | |
| Publication status | Published - 15 Nov 2005 |
Bibliographical note
Copyright 2005 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.Keywords
- Femtosecond inscription
- Fiber Bragg gratings
- Thermal annealing